- MicroNano Systems

I grew up in Cork and took my undergraduate degrees in Mathematical Science and Physics and masters degree in Mathematics at University College Cork. I attended the University of California at Berkeley for my PhD in Physics, where I specialized in condensed matter theory under the supervision of Steven Louie. I was a member of technical staff in the physical science division at Bell Laboratories, 1988-1990. I joined the faculty at the University of Michigan in 1990 and returned to UCC in 1993.

My research interests are in the theory of electronic properties of solids, particularly semiconductors and semimetals.

Vibrational Spectroscopy: The use of vibration mode frequencies as a probe of extreme physical environments has been a recurrent theme in my work, starting with early investigations of the Raman shift in diamond as a gauge for ultra-high pressure in diamond anvil systems. Subsequent work in collaboration with the experimental group of Roy Clarke on the infra-red absorption of cubic boron nitride thin films demonstrated conclusively that these films exhibit islanding in the initial stages of growth and ruled out extreme stress as the instigating factor in the growth of the cubic phase, thereby resolving a long-standing controversy in the field. Seminal work with R. Merlin on the extreme anharmonic excitation of coherent phonons in ferroelectric materials has prompted on-going experimental attempts by several groups to reverse domains on a picosecond time-scale by the application of intense, ultra-short optical pulses.

My most recent work in this area has investigated impulsive optical excitation of coherent phonons in semiconductors and simulated the resulting pump-probe reflectivity oscillations. Band structure calculations on tellurium and bismuth have demonstrated how their strong electron-phonon coupling is directly related to the Peierls distortion that stabilises the low-pressure phase of these materials. Results of these simulations have been used to understand the diffusion of carriers and their coupling to phonons in optically excited electron-hole plasmas, demonstrating both softening of the phonons at high levels of electronic excitation, slow electron-hole recombination and a substantial reduction in the carrier diffusion rate in the dense plasma. My work on ultrafast coherent dynamics has involved a particularly fruitful interaction with the experimental groups of David Reis, Roberto Merlin and Philip Bucksbaum at the FOCUS centre of the University of Michigan and Stanford University. This has culminated in recent x-ray probe measurements at the Stanford Linear Accelerator, Sub-Picosecond Pulse Source (SPPS), of the energy surface of photo-excited bismuth, which have verified our earlier calculations.

Recent calculations of nitrogen-related localized vibrational modes in dilute nitride semiconductors have provided signature spectra of various defects that are important in determining the microscopic structure and electronic transport properties of these materials. This work has led to a joint experimental-theoretical collaboration with the groups of Rachel Goldman and Cagliyan Kurdak at the University of Michigan. We are currently working on the design and growth of dilute nitride heterostructures in which we plan to use low-temperature transport as a spectroscopic probe of localized state scattering.

Quantum Monte Carlo: In the late 1980s and throughout the 1990s, my work was largely focused on the development of quantum Monte Carlo me

Year | Publication |
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1996 | Quantum Monte Carlo Methods Fahy, S.B.; (1996) Quantum Monte Carlo Methods . : Kluwer Academic Publishing. |

1993 | Ground State Projection With Auxiliary Fields: Imaginary-Time and Simulation-Time Dynamics Fahy, S.B.; (1993) Ground State Projection With Auxiliary Fields: Imaginary-Time and Simulation-Time Dynamics. : Springer. |

1993 | Ground-State Projection Using Auxiliary Fields Fahy, S.B.; (1993) Ground-State Projection Using Auxiliary Fields. : World Scientific. |

Year | Journal | Publication |
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2017 | Physical Review B | Scattering of carriers by coupled plasmon-phonon modes in bulk polar semiconductors and polar semiconductor heterostructures Hauber, Anna; Fahy. Stephen B. (2017) Scattering of carriers by coupled plasmon-phonon modes in bulk polar semiconductors and polar semiconductor heterostructures . : . [Details] |

2017 | Physical Review B | Ferroelectric phase transition and the lattice thermal conductivity of Pb(1-x)Ge(x)Te alloys R. M. Murphy, E. D. Murray. S. Fahy and I. Savic (2017) Ferroelectric phase transition and the lattice thermal conductivity of Pb(1-x)Ge(x)Te alloys. : . [Details] |

2016 | Physical Review B | Broadband phonon scattering in PbTe-based materials driven near ferroelectric phase transition by strain or alloying Murphy, RM,Murray, ED,Fahy, S,Savic, I (2016) Broadband phonon scattering in PbTe-based materials driven near ferroelectric phase transition by strain or alloying. : . [Details] |

2016 | Physical Review B | Resonant squeezing and the anharmonic decay of coherent phonons Fahy, S,Murray, ED,Reis, DA (2016) Resonant squeezing and the anharmonic decay of coherent phonons. : . [Details] |

2016 | Nature Communications | The origin of incipient ferroelectricity in lead telluride Jiang, M. P.; Trigo, M.; Savić, Ivana; Fahy, Stephen B.; Murray, Éamonn D.; Bray, C.; Clark, J.; Henighan, T.; Kozina, M.; Chollet, M.; Glownia, J. M.; Hoffmann, M. C.; Zhu, D.; Delaire, O.; May, A. F.; Sales, B. C.; Lindenberg, A. M.; Zalden, P.; Sato, T.; Merlin, R.; Reis, D. A. (2016) The origin of incipient ferroelectricity in lead telluride. : . [Details] |

2016 | Physical Review B | Control of two-phonon correlations and the mechanism of high-wavevector phonon generation by ultrafast light pulses Henighan, T,Trigo, M,Chollet, M,Clark, JN,Fahy, S,Glownia, JM,Jiang, MP,Kozina, M,Liu, H,Song, S,Zhu, D,Reis, DA (2016) Control of two-phonon correlations and the mechanism of high-wavevector phonon generation by ultrafast light pulses. : . [Details] |

2015 | Physical Review Letters | First-Principles Calculation of Femtosecond Symmetry-Breaking Atomic Forces in Photoexcited Bismuth Murray, ED;Fahy, S (2015) First-Principles Calculation of Femtosecond Symmetry-Breaking Atomic Forces in Photoexcited Bismuth. : AMER PHYSICAL SOC. [Details] |

2014 | Journal of Physics-Condensed Matter | Self-consistent Green's function method for dilute nitride conduction band structure Seifikar, M,O'Reilly, EP,Fahy, S (2014) Self-consistent Green's function method for dilute nitride conduction band structure. : . [Details] |

2014 | Nanoscale Research Letters | Optical Absorption of dilute nitride alloys using self-consistent Green's function method M. Seifikar, E. P. O'Reilly and S. Fahy (2014) Optical Absorption of dilute nitride alloys using self-consistent Green's function method. : . [Details] |

2013 | Physical Review Letters | Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons Li, JJ,Chen, J,Reis, DA,Fahy, S,Merlin, R (2013) Optical Probing of Ultrafast Electronic Decay in Bi and Sb with Slow Phonons. : . [Details] |

2013 | Applied Physics Letters | Time- and momentum-resolved probe of heat transport in photo-excited bismuth Chen, J,Trigo, M,Fahy, S,Murray, ED,Sheu, YM,Graber, T,Henning, R,Chien, YJ,Uher, C,Reis, DA (2013) Time- and momentum-resolved probe of heat transport in photo-excited bismuth. : . [Details] |

2013 | Nature Physics | Fourier-transform inelastic X-ray scattering from time- and momentum-dependent phonon-phonon correlations Trigo, M,Fuchs, M,Chen, J,Jiang, MP,Cammarata, M,Fahy, S,Fritz, DM,Gaffney, K,Ghimire, S,Higginbotham, A,Johnson, SL,Kozina, ME,Larsson, J,Lemke, H,Lindenberg, AM,Ndabashimiye, G,Quirin, F,Sokolowski-Tinten, K,Uher, C,Wang, G,Wark, JS,Zhu, D,Reis, DA (2013) Fourier-transform inelastic X-ray scattering from time- and momentum-dependent phonon-phonon correlations. : . [Details] |

2012 | Physical Review B | First-principles investigation of the alloy scattering potential in dilute Si1−xCx Vaughan, MP; F. Murphy-Armando, F; Fahy S (2012) First-principles investigation of the alloy scattering potential in dilute Si1−xCx. : . [Details] |

2012 | European Journal of Physics | How reflected wave fronts dynamically establish Hooke's law in a spring Fahy, S,O'Riordan, J,O'Sullivan, C,Twomey, P (2012) How reflected wave fronts dynamically establish Hooke's law in a spring. : . [Details] |

2012 | Journal of Applied Physics | Giant enhancement of n-type carrier mobility in highly strained germanium nanostructures (vol 109, 113703, 2011) Murphy-Armando, F,Fahy, S (2012) Giant enhancement of n-type carrier mobility in highly strained germanium nanostructures (vol 109, 113703, 2011). : . [Details] |

2012 | Physical Review B | Giant piezoresistance in silicon-germanium alloys Murphy-Armando, F. and Fahy, S. (2012) Giant piezoresistance in silicon-germanium alloys. : . |

2011 | Chinese Journal of Physics | Effect of strain on the deformation potentials in Ge-like SiGe Murphy-Armando, F. and Fahy, S. (2011) Effect of strain on the deformation potentials in Ge-like SiGe. : . |

2011 | Journal of Applied Physics | First principles calculation of electron-phonon and alloy scattering in strained SiGe Murphy-Armando, F. and Fahy, S. (2011) First principles calculation of electron-phonon and alloy scattering in strained SiGe. : . |

2011 | Journal of Applied Physics | Giant enhancement of n-type carrier mobility in highly strained germanium nanostructures Murphy-Armando, F. and Fahy, S. (2011) Giant enhancement of n-type carrier mobility in highly strained germanium nanostructures. : . |

2011 | Physical Review B | Mobility in gated GaNxAs1-x heterostructures as a probe of nitrogen-related electronic states Buckeridge, J,Fahy, S (2011) Mobility in gated GaNxAs1-x heterostructures as a probe of nitrogen-related electronic states. : . [Details] |

2011 | Physica Status Solidi B-Basic Solid State Physics | Modelling and direct measurement of the density of states in GaAsN Vaughan, MP,Fahy, S,O'Reilly, EP,Ivanova, L,Eisele, H,Dahne, M; (2011) Modelling and direct measurement of the density of states in GaAsN. : . [Details] |

2011 | Physica Status Solidi B-Basic Solid State Physics | Analysis of band-anticrossing model in GaNAs near localised states Seifikar, M,O'Reilly, EP,Fahy, S; (2011) Analysis of band-anticrossing model in GaNAs near localised states. : . [Details] |

2010 | Physical Review Letters | Comment on ``Directly Observing Squeezed Phonon States with Femtosecond X-Ray Diffraction'' Reply Johnson, SL; Beaud, P; Vorobeva, E; Milne, CJ; Murray, ED; Fahy, S; Ingold, G; (2010) Comment on ``Directly Observing Squeezed Phonon States with Femtosecond X-Ray Diffraction'' Reply. : . [Details] |

2010 | Physical Review Letters | Comment on "Directly Observing Squeezed Phonon States with Femtosecond X-Ray Diffraction'' Reply Johnson, SL; Beaud, P; Vorobeva, E; Milne, CJ; Murray, ED; Fahy, S; Ingold, G; (2010) Comment on "Directly Observing Squeezed Phonon States with Femtosecond X-Ray Diffraction'' Reply. : . [Details] |

2010 | Solid State Communications | Vibrational signature of the Si-N defect in Si-doped GaNxAs1-x Buckeridge, J,O'Halloran, S,Fahy, S; (2010) Vibrational signature of the Si-N defect in Si-doped GaNxAs1-x. : . [Details] |

2010 | Physical Review B | Nitrogen composition dependence of electron effective mass in GaAs1-xNx Dannecker, T,Jin, Y,Cheng, H,Gorman, CF,Buckeridge, J,Uher, C,Fahy, S,Kurdak, C,Goldman, RS; (2010) Nitrogen composition dependence of electron effective mass in GaAs1-xNx. : . [Details] |

2010 | Physical Review B | Direct measurement and analysis of the conduction band density of states in diluted GaAs1-xNx alloys Ivanova, L,Eisele, H,Vaughan, MP,Ebert, P,Lenz, A,Timm, R,Schumann, O,Geelhaar, L,Dahne, M,Fahy, S,Riechert, H,O'Reilly, EP; (2010) Direct measurement and analysis of the conduction band density of states in diluted GaAs1-xNx alloys. : . [Details] |

2010 | Acta Crystallographica Section A | Non-equilibrium phonon dynamics studied by grazing-incidence femtosecond X-ray crystallography Johnson, SL,Beaud, P,Vorobeva, E,Milne, CJ,Murray, ED,Fahy, S,Ingold, G; (2010) Non-equilibrium phonon dynamics studied by grazing-incidence femtosecond X-ray crystallography. : . [Details] |

2009 | Physical Review B | Vibrational mode shifts as a measure of local strain in the dilute nitride semiconductor alloy GaNxAs1-x Buckeridge, J. and Teweldeberhan, A. M. and Fahy, S.; (2009) Vibrational mode shifts as a measure of local strain in the dilute nitride semiconductor alloy GaNxAs1-x. : . [Details] |

2009 | Physical Review Letters | Observation of Insulating Nanoislands in Ferromagnetic GaMnAs Wang, DM,Ren, YH,Jacobs, PW,Fahy, S,Liu, X,Furdyna, JK,Sapega, VF,Merlin, R (2009) Observation of Insulating Nanoislands in Ferromagnetic GaMnAs. : . [Details] |

2008 | Physical Review B | Phonon spectra of the high-frequency modes in dilute nitride random GaNxAs1-x alloy Teweldeberhan, AM,Fahy, S; (2008) Phonon spectra of the high-frequency modes in dilute nitride random GaNxAs1-x alloy. : . [Details] |

2008 | Physical Review B | Resonant Raman-active localized vibrational modes in AlyGa1-yNxAs1-x alloys: Experiment and first-principles calculations Teweldeberhan, AM,Stenuit, G,Fahy, S,Gallardo, E,Lazic, S,Calleja, JM,Miguel-Sanchez, J,Montes, M,Hierro, A,Gargallo-Caballero, R,Guzman, A,Munoz, E; (2008) Resonant Raman-active localized vibrational modes in AlyGa1-yNxAs1-x alloys: Experiment and first-principles calculations. : . [Details] |

2008 | Physica E-Low-Dimensional Systems & Nanostructures | Resonant Raman Study of Local Vibration Modes In Algaasn Layers Gallardo, E, Lazic, S, Calleja, JM, Miguel-Sanchez, J, Montes, M, Hierro, A, Gargallo-Caballero, R, Guzman, A, Munoz, E, Teweldeberhan, AM, Fahy, S; (2008) Resonant Raman Study of Local Vibration Modes In Algaasn Layers. : . [Details] |

2008 | Physical Review B | First-principles calculation of carrier-phonon scattering in n-type Si_ $$1- x$$ Ge_ $$x$$ alloys Murphy-Armando, F. and Fahy, S. (2008) First-principles calculation of carrier-phonon scattering in n-type Si_ $$1- x$$ Ge_ $$x$$ alloys. : . |

2007 | Physical Review B | First-principles calculation of p-type alloy scattering in Si_ $$1- x$$ Ge_ $$x$$ Joyce, S. and Murphy-Armando, F. and Fahy, S. (2007) First-principles calculation of p-type alloy scattering in Si_ $$1- x$$ Ge_ $$x$$. : . |

2007 | Physical Review B | Phonon Dispersion Relations and Softening In Photoexcited Bismuth From First Principles Murray, ED, Fahy, S, Prendergast, D, Ogitsu, T, Fritz, DM, Reis, DA; (2007) Phonon Dispersion Relations and Softening In Photoexcited Bismuth From First Principles. : . [Details] |

2007 | Physical Review B | First-principles calculations of the mechanical and structural properties of GaNxAs1-x: Lattice and elastic constants Stenuit, G,Fahy, S; (2007) First-principles calculations of the mechanical and structural properties of GaNxAs1-x: Lattice and elastic constants. : . [Details] |

2007 | Physical Review B | Calculated mechanical and structural properties of GaNxAs1-x G. Stenuit and S. Fahy; (2007) Calculated mechanical and structural properties of GaNxAs1-x. : . |

2007 | Science | Ultrafast bond softening in bismuth: Mapping a solid's interatomic potential with X-rays Fritz, DM,Reis, DA,Adams, B,Akre, RA,Arthur, J,Blome, C,Bucksbaum, PH,Cavalieri, AL,Engemann, S,Fahy, S,Falcone, RW,Fuoss, PH,Gaffney, KJ,George, MJ,Hajdu, J,Hertlein, MP,Hillyard, PB,Hoegen, MHV,Kammler, M,Kaspar, J,Kienberger, R,Krejcik, P,Lee, SH,Lindenberg, AM,McFarland, B,Meyer, D,Montagne, T,Murray, ED,Nelson, AJ,Nicoul, M,Pahl, R,Rudati, J,Schlarb, H,Siddons, DP,Sokolowski-Tinten, K,Tschentscher, T,von der Linde, D,Hastings, JB; (2007) Ultrafast bond softening in bismuth: Mapping a solid's interatomic potential with X-rays. : . [Details] |

2006 | Physical Review Letters | First-Principles Calculation of Alloy Scattering in Ge_xSi_1-x Murphy-Armando, F. and Fahy, S.; (2006) First-Principles Calculation of Alloy Scattering in Ge_xSi_1-x. : . [Details] |

2006 | Physical Review B | Alloy scattering of n -type carriers in GaN_xAs_1-x Fahy, S., Lindsay, A., Ouerdane, H., O'Reilly, E.P.; (2006) Alloy scattering of n -type carriers in GaN_xAs_1-x. : . [Details] |

2006 | Phys. Rev. B | Effect of indium-nitrogen bonding on the localized vibrational mode in Iny Ga1-y Nx As1-x Teweldeberhan, A. M. and Fahy, S. ; (2006) Effect of indium-nitrogen bonding on the localized vibrational mode in Iny Ga1-y Nx As1-x . : . [Details] |

2006 | Journal of Physics-Condensed Matter | Simulations of Time-Resolved X-Ray Diffraction In Laue Geometry Lings, B, Wark, JS, DeCamp, MF, Reis, DA, Fahy, S; (2006) Simulations of Time-Resolved X-Ray Diffraction In Laue Geometry. : . [Details] |

2006 | Physical Review B | Effect of indium-nitrogen bonding on the localized vibrational mode in InyGa1-yNxAs1-x Teweldeberhan, AM,Fahy, S (2006) Effect of indium-nitrogen bonding on the localized vibrational mode in InyGa1-yNxAs1-x. : . [Details] |

2006 | Physical Review Letters | First-Principles Calculation of Alloy Scattering in Ge_ $$x$$ Si_ $$1-x$$ Murphy-Armando, F. and Fahy, S. (2006) First-Principles Calculation of Alloy Scattering in Ge_ $$x$$ Si_ $$1-x$$. : . |

2006 | Physical Review B | Alloy scattering of n-type carriers in GaNxAs1-x Fahy, S,Lindsay, A,Ouerdane, H,O'Reilly, EP; (2006) Alloy scattering of n-type carriers in GaNxAs1-x. : . [Details] |

2005 | Physical Review B: Rapid Communications | Effect of lattice anharmonicity on high-amplitude phonon dynamics in photoexcited bismuth E. D. Murray, D. M. Fritz, J. K. Wahlstrand, S. Fahy and D. A. Reis; (2005) Effect of lattice anharmonicity on high-amplitude phonon dynamics in photoexcited bismuth. : . [Details] |

2004 | Iee Proceedings - Optoelectronics | Intrinsic limits on electron mobility in disordered dilute nitride semiconductor alloys S. Fahy, A. Lindsay and E. P. O'Reilly; (2004) Intrinsic limits on electron mobility in disordered dilute nitride semiconductor alloys. : . [Details] |

2004 | Physical Review Letters | Coherent phonons: Electronic softening or anharmonicity? Fahy, S,Reis, DA (2004) Coherent phonons: Electronic softening or anharmonicity?. : . [Details] |

2003 | Applied Physics Letters | Intrinsic limits on electron mobility in dilute nitride semiconductors Fahy S, O'Reilly EP; (2003) Intrinsic limits on electron mobility in dilute nitride semiconductors. : . [Details] |

2002 | Physical Review B: Condensed Matter | Optimization of inhomogeneous electron correlation factors in periodic solids Prendergast D, Bevan D, Fahy S; (2002) Optimization of inhomogeneous electron correlation factors in periodic solids. : . [Details] |

2002 | Physical Review B: Condensed Matter | Density-functional theory approach to ultrafast laser excitation of semiconductors: Application to the A(1) phonon in tellurium Tangney P, Fahy S; (2002) Density-functional theory approach to ultrafast laser excitation of semiconductors: Application to the A(1) phonon in tellurium. : . [Details] |

2002 | The Journal of chemical physics | Optimization of configuration interaction coefficients in multideterminant Jastrow-Slater wave functions Schautz, F,Fahy, S (2002) Optimization of configuration interaction coefficients in multideterminant Jastrow-Slater wave functions. : . [Details] |

2001 | The Journal of chemical physics | Impact of electron-electron cusp on configuration interaction energies Prendergast, D,Nolan, M,Filippi, C,Fahy, S,Greer, JC (2001) Impact of electron-electron cusp on configuration interaction energies. : . |

2000 | Journal of Chemical Physics | Optimal orbitals from energy fluctuations in correlated wave functions Filippi C. and Fahy S.; (2000) Optimal orbitals from energy fluctuations in correlated wave functions. : . [Details] |

2000 | Materials Science In Semiconductor Processing | Alloy corrections to the virtual crystal approximation and explicit band structure calculations for silicon-germanium Fahy, S,Greer, JC (2000) Alloy corrections to the virtual crystal approximation and explicit band structure calculations for silicon-germanium. : . |

1999 | Physical Review Letters | Calculations of the A(1) phonon frequency in photoexcited tellurium Tangney P, Fahy S; (1999) Calculations of the A(1) phonon frequency in photoexcited tellurium. : . [Details] |

1998 | Physical Review E | Onset of chaos in a pendulum coupled to a thermal environment Fahy, S,Twohig, S,Stefansson, M,Courtney, D; (1998) Onset of chaos in a pendulum coupled to a thermal environment. : . |

1997 | Physical Review B | Variational quantum Monte Carlo calculation of the cohesive properties of cubic boron nitride Malatesta, A,Fahy, S,Bachelet, GB; (1997) Variational quantum Monte Carlo calculation of the cohesive properties of cubic boron nitride. : . |

1997 | Physical Review B: Condensed Matter | Islanding and Strain-Induced Shifts in the Infrared Absorption Peaks of Cubic Boron Nitride Thin Films Fahy, S. B.; Taylor, C. A.; Clarke, R.; (1997) Islanding and Strain-Induced Shifts in the Infrared Absorption Peaks of Cubic Boron Nitride Thin Films . : . [Details] |

1996 | Materials Research Society Symposia Proceedings | Variational Monte Carlo on a Parallel Architecture: an Application to Graphite Menchi, M.; Bosin, A.; Fahy, S. B.; (1996) Variational Monte Carlo on a Parallel Architecture: an Application to Graphite. : . |

1995 | Physical Review Letters | IMPULSIVE LIGHT-SCATTERING BY COHERENT PHONONS IN LAALO3 - DISORDER AND BOUNDARY EFFECTS LIU, Y,FRENKEL, A,GARRETT, GA,WHITAKER, JF,FAHY, S,UHER, C,MERLIN, R; (1995) IMPULSIVE LIGHT-SCATTERING BY COHERENT PHONONS IN LAALO3 - DISORDER AND BOUNDARY EFFECTS. : . |

1995 | Physical Review B: Rapid Communications | Strain-Induced Shifts in the Infra-Red Absorption Peaks of Boron Nitride Fahy, S.; (1995) Strain-Induced Shifts in the Infra-Red Absorption Peaks of Boron Nitride . : . [Details] |

1994 | Physical Review B: Condensed Matter | Molecular Dynamics Study of Single-Atom Radiation Damage in Diamond Wu, W.; Fahy, S. ; (1994) Molecular Dynamics Study of Single-Atom Radiation Damage in Diamond . : . [Details] |

1994 | Physical Review Letters | REVERSAL OF FERROELECTRIC DOMAINS BY ULTRASHORT OPTICAL PULSES FAHY, S,MERLIN, R; (1994) REVERSAL OF FERROELECTRIC DOMAINS BY ULTRASHORT OPTICAL PULSES. : . |

1993 | Physical Review B: Condensed Matter | Long-Range Interactions in Auxiliary-Field Many-Electron Calculations Hamann, D. R.; Fahy, S. B.; (1993) Long-Range Interactions in Auxiliary-Field Many-Electron Calculations . : . [Details] |

1992 | Physical Review Letters | Transition From Chaotic to Non-Chatoic Behavior in Randomly Driven Systems Fahy, S. B.; Hamann, D. R.; (1992) Transition From Chaotic to Non-Chatoic Behavior in Randomly Driven Systems. : . [Details] |

1991 | Physical Review B: Condensed Matter | Diffusive behavior of states in the Hubbard-Stratonovitch transformation Fahy S, Hamann D.R.; (1991) Diffusive behavior of states in the Hubbard-Stratonovitch transformation. : . [Details] |

1990 | Physical Review Letters | Positive-projection Monte Carlo simulation: A new variational approach to strongly interacting fermion systems FAHY SB, HAMANN DR; (1990) Positive-projection Monte Carlo simulation: A new variational approach to strongly interacting fermion systems. : . [Details] |

1990 | Physical Review B | Energy measurement in auxiliary-field many-electron calculations. Hamann DR, Fahy SB; (1990) Energy measurement in auxiliary-field many-electron calculations.. : . [Details] |

1990 | Physical Review Letters | Magnetic structure and equation of state of bcc solid hydrogen: A variational quantum Monte Carlo study. Wang XW, Zhu J, Louie SG, Fahy S; (1990) Magnetic structure and equation of state of bcc solid hydrogen: A variational quantum Monte Carlo study.. : . [Details] |

1990 | Physical Review B | Variational quantum Monte Carlo nonlocal pseudopotential approach to solids: Formulation and application to diamond, graphite, and silicon S. Fahy, X. W. Wang and Steven G. Louie; (1990) Variational quantum Monte Carlo nonlocal pseudopotential approach to solids: Formulation and application to diamond, graphite, and silicon. : . [Details] |

1990 | Physical Review B | Electronic and structural properties of CaSi2 S. Fahy and D. R. Hamann ; (1990) Electronic and structural properties of CaSi2. : . [Details] |

1989 | Physical Review B | Ab initio calculation of pressure coefficients of band gaps of silicon: Comparison of the local-density approximation and quasiparticle results Xuejun Zhu, S. Fahy, and Steven G. Louie ; (1989) Ab initio calculation of pressure coefficients of band gaps of silicon: Comparison of the local-density approximation and quasiparticle results. : . [Details] |

1988 | Physical Review B | Ab initio study of graphite --> diamondlike transitions in BN. Wentzcovitch RM, Fahy S, Cohen ML, Louie SG; (1988) Ab initio study of graphite --> diamondlike transitions in BN.. : . [Details] |

1988 | American Journal of Physics | Electromagnetic screening by metals S. Fahy and Charles Kittel and Steven G. Louie; (1988) Electromagnetic screening by metals. : . |

1988 | Physical Review B | Magnetic screening by a thin superconducting surface layer. Kittel C, Fahy S, Louie SG; (1988) Magnetic screening by a thin superconducting surface layer.. : . [Details] |

1988 | Physical Review Letters | Variational quantum Monte Carlo nonlocal pseudopotential approach to solids: Cohesive and structural properties of diamond. Fahy S, Wang XW, Louie SG; (1988) Variational quantum Monte Carlo nonlocal pseudopotential approach to solids: Cohesive and structural properties of diamond.. : . [Details] |

1987 | Physical Review B | Pressure coefficients of band gaps of diamond. Fahy S, Chang KJ, Louie SG, Cohen ML; (1987) Pressure coefficients of band gaps of diamond.. : . [Details] |

1987 | Phys. Rev. B | High-pressure structural and electronic properties of carbon Fahy, S. and Louie, Steven G.; (1987) High-pressure structural and electronic properties of carbon. : . [Details] |

1987 | Physical Review B | Probing electronic density of states and magnetic interactions at the rare-earth site in ErBa2Cu3O7. Walter U, Fahy S, Zettl A, Louie SG, Cohen ML, Tejedor P, Stacy AM; (1987) Probing electronic density of states and magnetic interactions at the rare-earth site in ErBa2Cu3O7.. : . |

1987 | Physical Review B | Theoretical total-energy study of the transformation of graphite into hexagonal diamond. Fahy S, Louie SG, Cohen ML; (1987) Theoretical total-energy study of the transformation of graphite into hexagonal diamond.. : . [Details] |

1986 | Physical Review B | Pseudopotential total-energy study of the transition from rhombohedral graphite to diamond. Fahy S, Louie SG, Cohen ML; (1986) Pseudopotential total-energy study of the transition from rhombohedral graphite to diamond.. : . |

1986 | Physica B+C | The first-order Raman mode of diamond under pressure M. Hanfland and K. Syassen and S. Fahy and Steven G. Louie and Marvin L. Cohen; (1986) The first-order Raman mode of diamond under pressure. : . [Details] |

1985 | Physical Review B | Pressure dependence of the first-order Raman mode in diamond. Hanfland M, Syassen K, Fahy S, Louie SG, Cohen ML; (1985) Pressure dependence of the first-order Raman mode in diamond.. : . |

Year | Journal | Publication |
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2010 | Journal of Physics: Conference Series | First principles calculations of the scattering cross section of substitutional carbon in silicon Vaughan, MP; Fahy, S (2010) First principles calculations of the scattering cross section of substitutional carbon in silicon. : . [Details] |

2009 | Phys. Rev. Lett | Viewpoint: Squeezing more out of ultrafast x-ray measurements Johnson, SL and Beaud, P and Vorobeva, E and Milne, CJ and Murray, 'ED and Fahy, S and Ingold, G (2009) Viewpoint: Squeezing more out of ultrafast x-ray measurements. : . |

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2012 | Ultimate Integration on Silicon (ULIS), 2012 13th International Conference on Murphy-Armando, F. and Fahy, S. (2012) Ultimate Integration on Silicon (ULIS), 2012 13th International Conference on. : . |

2011 | Ultimate Integration on Silicon (ULIS), 2011 12th International Conference on Vaughan, MP and Murphy-Armando, F. and Fahy, S. (2011) Ultimate Integration on Silicon (ULIS), 2011 12th International Conference on. : . |

2011 | Ultimate Integration on Silicon (ULIS), 2011 12th International Conference on Murphy-Armando, F. and Fahy, S. (2011) Ultimate Integration on Silicon (ULIS), 2011 12th International Conference on. : . |

2005 | 27th Int. Conf. on the Physics of Semiconductors A. Lindsay, S. Fahy and E.P. O'Reilly; (2005) 27th Int. Conf. on the Physics of Semiconductors. : . |

2003 | 26th Int. Conf. on the Physics of Semiconductors S. Fahy and E. P. O'Reilly; (2003) 26th Int. Conf. on the Physics of Semiconductors. : . |

1994 | 18th European Workshop on Compound Semiconductor Devices and Integrated Circuits (WOCSDICE) A. P. Morrison , J. D. Lambkin, E. O'Sullivan and S. Fahy; (1994) 18th European Workshop on Compound Semiconductor Devices and Integrated Circuits (WOCSDICE). : . |

1988 | 19th Int. Conf. Phys. of Semicond. S. Fahy, X. W. Wang, and S. G. Louie; (1988) 19th Int. Conf. Phys. of Semicond.. : . |

Year | Publication |
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2012 | Piezo-resistance in $ n $-type Si $ _ $$1-x$$ $ Ge $ _x $ alloys as a function of alloy composition and strain Murphy-Armando, F. and Fahy, S. (2012) Piezo-resistance in $ n $-type Si $ _ $$1-x$$ $ Ge $ _x $ alloys as a function of alloy composition and strain. : . |

2007 | Irish Atomistic Simulation Conference S.Fahy; (2007) Irish Atomistic Simulation Conference. : . |

2006 | Hole mobility in SiGe alloys from first principles. Joyce, S. and Murphy-Armando, F. and Fahy, S. (2006) Hole mobility in SiGe alloys from first principles.. : . |

2006 | First-principles calculation of phonon scattering of n-type carriers in SiGe alloys Murphy Armando, F. and Fahy, S. (2006) First-principles calculation of phonon scattering of n-type carriers in SiGe alloys. : . |

2005 | First-principles calculation of alloy scattering of n-type carriers in SiGe Murphy-Armando, F. and Fahy, S. (2005) First-principles calculation of alloy scattering of n-type carriers in SiGe. : . |

2004 | Irish Atomistic Simulation Conference S.Fahy; (2004) Irish Atomistic Simulation Conference. : . |

2001 | Irish Atomistic Simulation Conference S.Fahy; (2001) Irish Atomistic Simulation Conference. : . |

1998 | Irish Atomistic Simulation Conference S. Fahy; (1998) Irish Atomistic Simulation Conference. : . |

Year | Publication |
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1987 | Variational Monte Carlo sampling of the superconducting ground state S. Fahy and S. G. Louie; (1987) Variational Monte Carlo sampling of the superconducting ground state. : Lawrence Berkeley Laboratory. |

Year | Publication |
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1987 | Electronic properties, structural phase transitions, and bonding of carbon in the solid state S. Fahy; (1987) Electronic properties, structural phase transitions, and bonding of carbon in the solid state. : . |

- [2005] - Fellow of the American Physical Society
- [1985] - Victor Lenzen Scholarship, University of California
- [1982] - Regents Fellowship, University of California
- [1981] - Travelling Studentship in Mathematical Science, National University of Ireland
- [1976] - College Scholarship, University College Cork

- Fellow

- [1995] 5,477,519 - Data storage using pulsed optical domain reversal

- [1995] European TMR Network Coordinator,
- [2001] Committee for Physics of Royal Irish Academy ,
- [1998] Irish Atomistic Simulation Conference , 1998, 2001, 2004, 2007
- [2005] Scientific Council, Irish Centre for High-end Computing (Chair, 2005-2008),
- [2006] Academic Council Research Committee, University College Cork (Chair, 2006-2009),
- [2007] Research Committee, Tyndall National Institute (Chair),

Irish Primary Schools Outreach Programme - Bridging the Gap (2003-2005)

Tyndall Sound Show - demonstration lecture for primary school students

Sound Show, presented at the British Association Meeting, Dublin, 2005

- SFI UREKA Programme for undergraduate research experience (2004-2007)
- SFI STARS Programme for Secondary School Teachers (2004-2005)

- [1992] Department of Physics / Tyndall Institute - Associate Professor / Academic Member
- [1990] University of Michigan, USA - Assistant Professor of Physics and Applied Physics
- [1988] AT&T Bell Laboratories, Murray Hill, USA - Member of Technical Staff
- [1987] University of California, Berkeley - Postdoctoral fellow

- [1987] University of California, Berkeley - PhD
- [1981] University College Cork - MSc
- [1979] University College Cork - BSc

- [1997] Enterprise Ireland/Forbairt - Basic Science Grants Scheme
- [2007] Science Foundation Ireland - Research Frontiers Programme 2007
- US National Science Foundation - : Reviewer for Division of Materials Research

- Phys Rev B - Referee
- Physical Review Letters - Referee
- Journal of Physics A - Referee
- Applied Physics Letters - Referee

My teaching interests are in general physics, condensed matter physics, theoretical & computational physics. Currently I am teaching:

Introductory Physics (PY1052 and PY1053) for physical and mathematical science majors

Condensed Matter Physics (PY3105 and PY4104)

Computational Physics (PY2105 and PY4109)

INSPIRE graduate course on Numerical Methods