Chris is a computational condensed matter physicist, developing quantitative theory and predictive multi-scale simulations for emerging material systems. The overarching theme of his research is to identify and engineer novel and atypical material properties to guide the development of next-generation device technologies offering improved performance and new capabilities.
This encompasses techniques ranging from atomic-scale analysis of material properties based on first-principles calculations, through the development of parametrisation of empirical atomistic and empirical models that can be applied to design and optimise realistically-sized nanostructures for targeted applications in photonic and electronic devices. Chris’s current research interests include direct-gap group-IV semiconductor alloys, and crystal phase engineered semiconductors, as enabling platforms for Si photonics and post-CMOS electronics. This work is underpinned by model and software development, and characterised by close links to experiment.
Chris is a Senior Researcher at Tyndall, where he is a member of the Photonics Theory Group. He is co-affiliated with the School of Physics, University College Cork as Royal Society-Science Foundation Ireland University Research Fellow.
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Biography
I am a Staff Researcher (Senior Researcher) at Tyndall National Institute, University College Cork, Ireland, currently on secondment with the group of Prof. Chris Van de Walle at the University of California, Santa Barbara, U.S.A. as a European Union Marie Skłodowska-Curie Global Fellow.
I was a Postdoctoral Researcher at Tyndall prior to my promotion to Staff Researcher in 2021 and, prior to that, I was a Postdoctoral Research Associate at the University of Bristol, U.K. I hold B.Sc. (Hons) and Ph.D. degrees in physics from University College Cork.
My interests lie in materials theory in simulation, focusing on (i) developing fundamental theoretical understanding of the electronic and optical properties of novel and emerging semiconductor material systems, and (ii) developing models and software to enable multi-scale simulations of semiconductor materials and devices, building key insights obtained from atomistic electronic structure calculations into atomistic and continuum empirical models suitable to quantitatively predict technologically relevant properties in semiconductor materials and nanostructures.
My experience ranges from performing first principles calculations and analysis of fundamental material properties, through the derivation and parametrisation of empirical models for multi-scale simulations, as well as software implementations of these models (including enabling interoperability between proprietary, open-source and self-developed software packages).
Research Interests
Research Grants
| Funder | Start Date | End Date | Title | Role |
|---|---|---|---|---|
| National University of Ireland (NUI) | 01-MAR-18 | 29-FEB-20 | National University of Ireland Post-Doctoral Fellowship in the Sciences | |
| Royal Irish Academy | 01-JUN-19 | 30-NOV-19 | Charlemont Grant | |
| European Commission | 01-OCT-21 | 30-SEP-24 | Marie Skłodowska-Curie Global Fellowship | |
| Irish Research Council | 01-OCT-10 | 30-SEP-13 | EMBARK Postgraduate Scholarship |
Publications
Peer Reviewed Journals
| Year | Journal | Publication |
|---|---|---|
| 2022 | Physical Review Applied | Impact of band anticrossing on band-to-band tunneling in highly mismatched semiconductor alloys S. Das, C. A. Broderick, and E. P. O’Reilly (2022) Impact of band anticrossing on band-to-band tunneling in highly mismatched semiconductor alloys. : . |
| 2022 | Physical Review Materials | Electronic and optical properties of SiGeSn alloys lattice-matched to Ge P. M. Pearce, C. A. Broderick, M. P. Nielsen, A. D. Johnson, and N. J. Ekins-Daukes (2022) Electronic and optical properties of SiGeSn alloys lattice-matched to Ge. : . |
| 2021 | Journal of Physics D: Applied Physics | Impact of stoichiometry and strain on GeSn alloys from first principles calculations C. O’Donnell, A. Sanchez-Soares, C. A. Broderick, and J. C. Greer (2021) Impact of stoichiometry and strain on GeSn alloys from first principles calculations. : . |
| 2021 | Applied Physics Letters | Monolithic infrared silicon photonics: The rise of (Si)GeSn semiconductors O. Moutanabbir, S. Assali, X. Gong, E. P. O’Reilly, C. A. Broderick, B. Marzban, J. Witzens, W. Du, S.-Q. Yu, A. Chelnokov, D. Buca, and D. Nam (2021) Monolithic infrared silicon photonics: The rise of (Si)GeSn semiconductors. : . |
| 2020 | Chemistry of Materials | Progress on germanium-tin nanoscale alloys J. Doherty, S. Biswas, E. Galluccio, C. A. Broderick, A. Garcia-Gil, R. Duffy, E. P. O’Reilly, and J. D. Holmes (2020) Progress on germanium-tin nanoscale alloys. : . |
| 2020 | Physical Review Applied | Continuous-wave magneto-optical determination of the carrier lifetime in coherent GeSn/Ge heterostructures E. Vitiello, S. Rossi, C. A. Broderick, G. Gravina, A. Balocchi, X. Marie, E. P. O’Reilly, M. Myronov, and F. Pezzoli (2020) Continuous-wave magneto-optical determination of the carrier lifetime in coherent GeSn/Ge heterostructures. : . |
| 2020 | Optical and Quantum Electronics | Electronic properties of type-II GaAsSb/GaAs quantum rings for applications in intermediate band solar cells R. Arkani, C. A. Broderick, and E. P. O’Reilly (2020) Electronic properties of type-II GaAsSb/GaAs quantum rings for applications in intermediate band solar cells. : . |
| 2019 | Journal of Applied Physics | Electronic structure evolution in dilute carbide GeC alloys and implications for device applications C. A. Broderick, M. D. Dunne, D. S. P. Tanner, and E. P. O’Reilly (2019) Electronic structure evolution in dilute carbide GeC alloys and implications for device applications. : . |
| 2019 | Optical and Quantum Electronics | Comparison of first principles and semi-empirical models of the structural and electronic properties of GeSn alloys E. J. O’Halloran, C. A. Broderick, D. S. P. Tanner, S. Schulz, and E. P. O’Reilly (2019) Comparison of first principles and semi-empirical models of the structural and electronic properties of GeSn alloys. : . |
| 2019 | Journal of Physics D: Applied Physics | Optical properties of metamorphic type-I InAsSb/Al In As quantum wells grown on GaAs for the mid-infrared spectral range E. Repiso, C. A. Broderick, M. de la Mata, R. Arkani, Q. Lu, A. R. J. Marshall, S. I. Molina, E. P. O’Reilly, P. J. Carrington, and A. Krier (2019) Optical properties of metamorphic type-I InAsSb/Al In As quantum wells grown on GaAs for the mid-infrared spectral range. : . |
| 2019 | Scientific Reports | Giant bowing of the band gap and spin-orbit splitting energy in GaPBi dilute bismide alloys Z. L. Bushell, C. A. Broderick, L. Nattermann, R. Joseph, J. L. Keddie, J. M. Rorison, K. Volz, and S. J. Sweeney (2019) Giant bowing of the band gap and spin-orbit splitting energy in GaPBi dilute bismide alloys. : . |
| 2018 | Physical Review Applied | Impact of disorder on the optoelectronic properties of GaNAsBi alloys and heterostructures M. Usman, C. A. Broderick, and E. P. O’Reilly (2018) Impact of disorder on the optoelectronic properties of GaNAsBi alloys and heterostructures. : . |
| 2018 | Semiconductor Science and Technology | Theory and design of InGaAsBi mid-infrared semiconductor lasers: type-I quantum wells for emission beyond 3 μm on InP substrates C. A. Broderick,W. Xiong, S. J. Sweeney, E. P. O’Reilly, and J. M. Rorison (2018) Theory and design of InGaAsBi mid-infrared semiconductor lasers: type-I quantum wells for emission beyond 3 μm on InP substrates. : . |
| 2017 | Scientific Reports | GaAsBi/GaNAs type-II quantum wells: novel strain-balanced heterostructures for GaAs-based near-and mid-infrared photonics C. A. Broderick, S. R. Jin, I. P. Marko, K. Hild, P. Ludewig, Z. L. Bushell, W. Stolz, J. M. Rorison, E. P. O’Reilly, K. Volz, Stephen J Sweeney (2017) GaAsBi/GaNAs type-II quantum wells: novel strain-balanced heterostructures for GaAs-based near-and mid-infrared photonics. : . |
| 2017 | IET Optoelectronics | Highly-mismatched III-V semiconductor alloys applied in multiple quantum well photovoltaics W. Xiong, C. A. Broderick, and J. M. Rorison (2017) Highly-mismatched III-V semiconductor alloys applied in multiple quantum well photovoltaics. : . |
| 2016 | IEEE Journal of Quantum Electronics | Theory and optimization of 1.3-μm metamorphic quantum well lasers S. Bogusevschi, C. A. Broderick, and E. P. O’Reilly (2016) Theory and optimization of 1.3-μm metamorphic quantum well lasers. : . |
| 2016 | Scientific Reports | Optical gain in GaAsBi/GaAs quantum well diode lasers I. P. Marko, C. A. Broderick, S. R. Jin, P. Ludewig, W. Stolz, K. Volz, J. M. Rorison, E. P. O’Reilly, and S. J. Sweeney (2016) Optical gain in GaAsBi/GaAs quantum well diode lasers. : . |
| 2015 | IEEE Journal of Selected Topics In Quantum Electronics | Theory of the electronic and optical properties of dilute bismide quantum well lasers C. A. Broderick, P. E. Harnedy, and E. P. O’Reilly (2015) Theory of the electronic and optical properties of dilute bismide quantum well lasers. : . |
| 2015 | Semiconductor Science and Technology | Determination of type-I band offsets in GaBixAs1–x quantum wells using polarisation-resolved photovoltage spectroscopy and 12-band k.p calculations C. A. Broderick, P. Harnedy, P. Ludewig, Z. L. Bushell, K. Volz, R. J. Manning, and E. P. O’Reilly (2015) Determination of type-I band offsets in GaBixAs1–x quantum wells using polarisation-resolved photovoltage spectroscopy and 12-band k.p calculations. : . |
| 2015 | Semiconductor Science and Technology | Experimental and modelling study of InGaBiAs/InP alloys with up to 5.8% Bi, and with Δso > Eg G. M. T. Chai, C. A. Broderick, E. P. O’Reilly, Z. Othaman, S. R. Jin, J. P. Petropoulos, Y. Zhong, P. B. Dongmo, J. M. O. Zide, S. J. Sweeney, and T. J. C. Hosea (2015) Experimental and modelling study of InGaBiAs/InP alloys with up to 5.8% Bi, and with Δso > Eg. : . |
| 2014 | Physical Review B | Anisotropic electron g factor as a probe of the electronic structure of GaBiAs/GaAs epilayers C. A. Broderick, S. Mazzucato, H. Carrère, T. Amand, H. Makhloufi, A. Arnoult, C. Fontaine, O. Donmez, A. Erol, M. Usman, E. P. O’Reilly, and X. Marie (2014) Anisotropic electron g factor as a probe of the electronic structure of GaBiAs/GaAs epilayers. : . |
| 2014 | Journal of Luminescence | Luminescence properties of dilute bismide systems B. Breddermann, A. Bäumner, S. W. Koch, P. Ludewig, W. Stolz, K. Volz, J. Hader, J. V. Moloney, C. A. Broderick, and E. P. O’Reilly (2014) Luminescence properties of dilute bismide systems. : . |
| 2013 | Physica Status Solidi B-Basic Solid State Physics | 12‐band k.p model for dilute bismide alloys of (In)GaAs derived from supercell calculations C. A. Broderick, M. Usman, and E. P. O’Reilly (2013) 12‐band k.p model for dilute bismide alloys of (In)GaAs derived from supercell calculations. : . |
| 2013 | Physical Review B | Impact of alloy disorder on the band structure of compressively strained GaBiAs M. Usman, C. A. Broderick, Z. Batool, K. Hild, T. J. C. Hosea, S. J. Sweeney, and E. P. O’Reilly (2013) Impact of alloy disorder on the band structure of compressively strained GaBiAs. : . |
| 2013 | Semiconductor Science and Technology | Derivation of 12- and 14-band k·p Hamiltonians for dilute bismide and bismide-nitride semiconductors C. A. Broderick, M. Usman, and E. P. O’Reilly (2013) Derivation of 12- and 14-band k·p Hamiltonians for dilute bismide and bismide-nitride semiconductors. : . |
| 2012 | Semiconductor Science and Technology | Band engineering in dilute nitride and bismide semiconductor lasers M. Usman, C. A. Broderick, A. Lindsay, and E. P. O’Reilly (2012) Band engineering in dilute nitride and bismide semiconductor lasers. : . |
| 2011 | Physical Review B | Tight-binding analysis of the electronic structure of dilute bismide alloys of GaP and GaAs M. Usman, C. A. Broderick, A. Lindsay, and E. P. O’Reilly (2011) Tight-binding analysis of the electronic structure of dilute bismide alloys of GaP and GaAs. : . |
Conference Publications
| Year | Publication |
|---|---|
| 2021 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. Murphy, E. P. O’Reilly, and C. A. Broderick (2021) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2021 | IEEE International Semiconductor Laser Conference (IEEE-ISLC) Z. C. M. Davidson, T. Hepp, J. M. Rorison, S. J. Sweeney, K. Volz, and C. A. Broderick (2021) IEEE International Semiconductor Laser Conference (IEEE-ISLC). : . |
| 2021 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) Z. C. M. Davidson, J. M. Rorison, S. J. Sweeney, and C. A. Broderick (2021) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2020 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick (2020) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2020 | IEEE Photonics Society Summer Topicals Meeting Series (IEEE-SUM) C. A. Broderick, E. J. O’Halloran, M. D. Dunne, A. C. Kirwan, A. D. Andreev, S. Schulz, and E. P. O’Reilly (2020) IEEE Photonics Society Summer Topicals Meeting Series (IEEE-SUM). : . |
| 2020 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) M. D. Dunne, C. A. Broderick, M. Luisier, and E. P. O’Reilly (2020) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2019 | International Conference on Numerical Simulation of Optoelectronic Devices C. A. Broderick, S. Das, and E. P. O’Reilly (2019) International Conference on Numerical Simulation of Optoelectronic Devices. : . |
| 2019 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) R. Arkani, C. A. Broderick, and E. P. O’Reilly (2019) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2019 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick, E. J. O’Halloran, and E. P. O’Reilly (2019) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2019 | IEEE International Conference on Group-IV Photonics (IEEE-GFP) C. A. Broderick, E. J. O’Halloran, A. C. Kirwan, M. D. Dunne, D. S. P. Tanner, S. Schulz, and E. P. O’Reilly (2019) IEEE International Conference on Group-IV Photonics (IEEE-GFP). : . |
| 2018 | IEEE International Conference on Nanotechnology (IEEE-NANO) A. C. Kirwan, E. J. O’Halloran, C. A. Broderick, S. Schulz, and E. P. O’Reilly (2018) IEEE International Conference on Nanotechnology (IEEE-NANO). : . |
| 2018 | International Conference on Numerical Simulations of Optoelectronic Devices (NUSOD) S. Schulz, C. A. Broderick, E. J. O’Halloran, and E. P. O’Reilly (2018) International Conference on Numerical Simulations of Optoelectronic Devices (NUSOD). : . |
| 2018 | IEEE International Conference on Nanotechnology (IEEE-NANO) C. A. Broderick, M. D. Dunne, D. S. P. Tanner, A. C. Kirwanv, E. J. O’Halloranl, S. Schulz, and E. P. O’Reilly (2018) IEEE International Conference on Nanotechnology (IEEE-NANO). : . |
| 2018 | IEEE International Conference on Nanotechnology (IEEE-NANO) R. Arkani, C. A. Broderick, and E. P. O’Reilly (2018) IEEE International Conference on Nanotechnology (IEEE-NANO). : . |
| 2018 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) R. Arkani, C. A. Broderick, and E. P. O’Reilly (2018) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2017 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick, W. Xiong, S. R. Jin, I. P. Marko, Z. L. Bushell, K. Hild, P. Ludewig, W. Stolz, K. Volz, J. M. Rorison, S. J. Sweeney, and E. P. O’Reilly (2017) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2016 | International Conference on Transparent Optical Networks (ICTON) J. M. Rorison, C. A. Broderick, W. Xiong, Q. Wang (2016) International Conference on Transparent Optical Networks (ICTON). : . |
| 2016 | International Conference on Transparent Optical Networks (ICTON) C. A. Broderick, W. Xiong, S. J. Sweeney, E. P. O’Reilly, and J. M. Rorison (2016) International Conference on Transparent Optical Networks (ICTON). : . |
| 2016 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick, S. Bogusevschi, and E. P. O’Reilly (2016) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2016 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick, J. M. Rorison, I. P. Marko, S. J. Sweeney, and E. P. O’Reilly (2016) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2016 | International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) C. A. Broderick, W. Xiong, and J. M. Rorison (2016) International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD). : . |
| 2014 | IEEE International Semiconductor Laser Conference (IEEE-ISLC) S. J. Sweeney, I. P. Marko, S. R. Jin, K. Hild, Z. Batool, P. Ludewig, L. Natterman, Z. L. Bushell, W. Stolz, K. Volz, C. A. Broderick, M. Usman, P. E. Harnedy, E. P. O’Reilly, R. Butkute, V. Pacebutas, A. Geiutis, and A. Krotkus (2014) IEEE International Semiconductor Laser Conference (IEEE-ISLC). : . |
| 2011 | International Conference on Transparent Optical Networks (ICTON) C. A. Broderick, M. Usman, A. Lindsay, and E. P. O’Reilly (2011) International Conference on Transparent Optical Networks (ICTON). : . |
Book Chapters
| Year | Publication |
|---|---|
| 2020 | Chapter 2: Mid-Infrared Light-Emitting Diodes A. Krier, E. Repiso, F. Al-Saymari, P. J. Carrington, A. R. J. Marshall, L. Qi, S. E. Krier, K. J. Lulla, M. Steer, C. MacGregor, C. A. Broderick, R. Arkani, E. P. O’Reilly, M. Sorel, S. I. Molina, and M. De La Mata (2020) Chapter 2: Mid-Infrared Light-Emitting Diodes. : Woodhead Publishing. |
| 2017 | Chapter 9: Dilute Nitride Alloys C. A. Broderick, M. Seifikar, J. M. Rorison, and E. P. O’Reilly (2017) Chapter 9: Dilute Nitride Alloys. : CRC Press. |
| 2017 | Chapter 10: Dilute Bismide Alloys C. A. Broderick, I. P. Marko, E. P. O’Reilly, and S. J. Sweeney (2017) Chapter 10: Dilute Bismide Alloys. : CRC Press. |
| 2013 | Chapter 3: Theory of the Electronic Structure of Dilute Bismide Alloys – Tight-Binding and k.p Models C. A. Broderick, M. Usman, and E. P. O’Reilly (2013) Chapter 3: Theory of the Electronic Structure of Dilute Bismide Alloys – Tight-Binding and k.p Models. : Springer. |
Professional Activities
Professional Associations
- Member
- Member
- Member
- Associated Member
Employment
- [2015] University of Bristol – Postdoctoral Researcher
- [2016] Tyndall National Institute – Postdoctoral Researcher
- [2021] Tyndall National Institute – Staff Researcher (Senior Researcher)
- [2021] University of California, Santa Barbara – Research Fellow (Visiting)
Education
- [2010] University College Cork – B.Sc. (Hons.)
- [2015] University College Cork – Ph.D.
- [2018] The Institute of Leadership and Management – Professional Skills for Research Leaders
Journal Activities
- Phys Rev B – Referee
- J Appl Phys – Referee
- Applied Physics Letters – Referee
- IEEE J Sel Top Quant – Referee
- IEEE Journal of Quantum Electronics – Referee
- Semiconductor Science and Technology – Referee
- Thin Solid Films – Referee
- Superlattice Microst – Referee
- Opt Quant Electron – Referee
- J Comput Electron – Referee
- Aip Adv – Referee
- Comp Mater Sci – Referee
- NPG Asia Materials – Referee
- Journal of Physics D: Applied Physics – Referee
- Mater Today – Referee
- Physica E – Referee
- Modelling And Simulation In Materials Science And Engineeringmodelling And Simulation In Materials Science And Engineering – Referee
- Journal Of Vacuum Science & Technology A: Vacuum, Surfaces, And Films – Referee
- Proceedings of the National Acadamy of Sciences – Referee
- Infrared Physics and Technology – Referee
- Heliyon – Referee
- Mat Sci Semicon Proc – Referee
- Appl Phys Express – Referee
- Acs Photonics – Referee
- ACS Applied Energy Materials – Referee
- Journal Of Physics-Condensed Matterjournal Of Physics-Condensed Matter – Referee
- Phys Status Solidi B – Referee
Honours and Awards
- [2014] – BOC Gases Postgraduate Bursary
- [2019] – 69th Lindau Nobel Laureate Meeting
- [2010] – Official Acknowledgement of Academic Excellence
- [2008] – Title of College Scholar
- [2009] – Title of College Scholar
- [2010] – Title of College Scholar
- [2011] – Title of College Scholar
- [2020] – “Top-Ten” paper at the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)
- [2019] – “Top-Ten” paper at the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)
- [2018] – “Top-Ten” paper at the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)
- [2016] – “Top-Ten” paper at the International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD)
- [2012] – “Highlight of 2012” paper for the Institute of Physics journal Semiconductor Science and Technology
- [2022] – Outstanding Reviewer (Journal of Physics D: Applied Physics)
Committees
- [2017] National University of Ireland: “Developing Supports for Postdoctoral Researchers and Early-Career Academics”,
- [2020] National University of Ireland: “Developing Supports for Postdoctoral Researchers and Early-Career Academics”,
- [2014] Local Organising Committee – 5th International Workshop on Bismuth-Containing Semiconductors,
- [2022] Program Committee – International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD), The Committee sets the scientific agenda of the annual NUSOD conference, including session and invited speaker nomination and selection, in addition to refereeing of submitted conference paper.
Outreach Activities
- Established and co-manage the @TyndallPTG Twitter account of the Photonics Theory Group at Tyndall National Institute.
- Undergraduate intern scientific supervisor and professional mentor with the Irish Photonic Integration Centre (IPIC)
Consultancy
- Self-developed suite of optoelectronic device simulation software employed in several consultancy contracts with international photonics companies (ongoing activity) –
Teaching Activities
Current Postgraduates
| Student | Degree |
|---|---|
| Murphy Cónal | Doctoral Degree |