Skip to main content

Trinity College Dublin, The University of Dublin

Menu Search

Trinity College Dublin By using this website you consent to the use of cookies in accordance with the Trinity cookie policy. For more information on cookies see our cookie policy.

Tá Gaeilge agam.       
Profile Photo

Dr. David O'Regan

Associate Professor (Physics)

David completed his PhD at the Cavendish Laboratory, University of Cambridge, in 2011, after which he carried out post-doctoral research first there, and then at the École Polytechnique Fédérale de Lausanne (EPFL). In 2014, he came to Trinity College Dublin and founded what is now the Quantum Theory of Materials Group. David is an Associate Professor in the School of Physics, a CRANN Institute Principal Investigator with an affiliation to the SFI AMBER Research Centre, and a Fellow of Trinity College Dublin since 2022. David's research is dedicated to finding unexpected, innovative ways to transform the accuracy, efficiency, and applicability of theory and simulation software for understanding the material world using quantum mechanics. He is known for his work on simulating, from the electrons up, systems that are both spatially complex (e.g., disordered crystals or molecules) and harbour strong interactions that are beyond the predictive capacity of standard techniques. David is particularly known for his work on extending and refining the class of methods known as constrained DFT and DFT+U. David is actively involved in the development of linear-scaling density functional theory. Here, he implements and improve corrective approaches such as DFT+U, constrained DFT and DFT+DMFT in addition to researching new Wannierisation and time-propagation (TDDFT) algorithms. David maintains a long-term programme in the development of tractable and user-friendly methods moving beyond Kohn-Sham DFT, via the density-matrix and Green's function, not only for spectra but for energies and their derivatives. He's interested in magnetic and multiple-valence properties, generally, and optical, magneto-optical, and photoemission spectroscopies. A particular focus is placed on these properties as exhibited by transition-metal comprising materials, complexes, and nanostructures. David's recent grants and awards include the EPSRC-SFI Joint Funding of Research award, SFI AMBER II Funded Investigator status, an AMBER Director's Fund award, a Trinity Provost's PhD Project award, Irish Research Council postgraduate award mentorship, leadership of a competitively-awarded College infrastructure project, as well as research partnership with industry and sponsorship from Enterprise Ireland and the Royal Irish Academy. At Trinity, David has recently served as Director of Teaching & Learning (Undergraduate), Physics (3 years); Chair, School of Physics Teaching & Learning Committee; Member, Central Scholarship Committee (current); College Tutor (6 years); Member, School Executive Committee; Member, Trinity Undergraduate Studies Committee; Member, Institutional Academic Integrity Working Group; Member (current), School Athena SWAN Committee, Member (current), Theoretical Physics Degree Course Committee. In previous years he has served as School of Physics Examinations Coordinator; Chair, School of Physics Resumption of Teaching Steering Committee; CRANN seminar series Convenor; Coordinator of the School of Physics Summer Undergraduate Research Experience (SURE) programme, and as the Theoretical Physics Degree Coordinator in Physics.
Language Skill Reading Skill Writing Skill Speaking
English Fluent Fluent Fluent
French Medium Medium Medium
Irish Medium Medium Medium
Spanish Basic Basic Basic
Moore G.C., Horton M.K., Linscott E., Ganose A.M., Siron M., O'Regan D.D., Persson K.A., High-throughput determination of Hubbard U and Hund J values for transition metal oxides via the linear response formalism, Physical Review Materials, 8, (1), 2024, Journal Article, PUBLISHED  DOI
Bhandary S., Poli E., Teobaldi G., O'Regan D.D., Dynamical Screening of Local Spin Moments at Metal-Molecule Interfaces, ACS Nano, 17, (6), 2023, p5974 - 5983, Journal Article, PUBLISHED  DOI
Lambert, D. S., O'Regan, D. D., Use of DFT+U+J with linear response parameters to predict non-magnetic oxide band gaps with hybrid-functional accuracy, Physical Review Research, 5, (1), 2023, Journal Article, PUBLISHED  DOI
Burgess A.C., Linscott E., O'Regan D.D., DFT+U-type functional derived to explicitly address the flat plane condition, Physical Review B, 107, (12), 2023, Journal Article, PUBLISHED  DOI
Berman S., Zhussupbekova A., Walls B., Walshe K., Bozhko S.I., Ionov A., O'Regan D.D., Shvets I.V., Zhussupbekov K., Unraveling the atomic and electronic structure of nanocrystals on superconducting Nb(110): Impact of the oxygen monolayer, Physical Review B, 107, (16), 2023, Journal Article, PUBLISHED  DOI
Halder, Anita, Bhandary, Sumanta, O'Regan, David D., Sanvito, Stefano, Droghetti, Andrea, Theoretical perspective on the modification of the magnetocrystalline anisotropy at molecule-cobalt interfaces, Physical Review Materials, 7, (6), 2023, p064409-, Journal Article, PUBLISHED  DOI
Murray, Christopher P., Mamyraimov, Daniyar, Ali, Mugahid, Downing, Clive, Povey, Ian M., McCloskey, David, O'Regan, David D., Donegan, John F., Monolayer Capping Provides Close to Optimal Resistance to Laser Dewetting of Au Films, ACS Applied Electronic Materials, 5, (8), 2023, p4080-4093 , Journal Article, PUBLISHED  DOI
Macenulty L., O'Regan D.D., Optimization strategies developed on NiO for Heisenberg exchange coupling calculations using projector augmented wave based first-principles DFT+U+J, Physical Review B, 108, (24), 2023, Journal Article, PUBLISHED  DOI
Burgess A.C., Linscott E., O'Regan D.D., The convexity condition of density-functional theory, Journal of Chemical Physics, 159, (21), 2023, Journal Article, PUBLISHED  DOI
Berman S., Zhussupbekova A., Boschker J.E., Schwarzkopf J., O'Regan D.D., Shvets I.V., Zhussupbekov K., Reconciling the theoretical and experimental electronic structure of NbO2, Physical Review B, 108, (15), 2023, p155141-, Journal Article, PUBLISHED  DOI

Page 1 of 5
D. D. O'Regan, Force calculations in density-functional theory with extra challenges: Strongly-correlated materials, multi-centre constraints, and time-evolving basis sets, American Chemical Society Fall 2021 National Meeting & Exposition, Online and Atlanta, GA, U.S.A., 2021, Invited Talk, PRESENTED
D. D. O'Regan, The partner of the Hubbard U: interpretation of Hund's J in DFT+U methods, linear-response calculations for J, and the results to expect, EPFL THEOS Group & NCCR-MARVEL Seminar, Online and Lausanne, CH, 2021, Invited Talk, PRESENTED
D. Lambert and D. D. O'Regan, Systematic Evaluation of First Principles DFT+U+J Algorithms for the Fast and Accurate Modelling of Transition Metal Oxides, MRS Fall Meeting and Exhibit, Online and Boston, MA, U.S.A., 2021, Oral Presentation, PRESENTED
K. Elibol, C. Mangler, D. D. O'Regan, K. Mustonen, D. Eder, J. C. Meyer, J. Kotakoski, R. G. Hobbs, P. A. van Aken, T. Susi, and B. C. Bayer, Self-assembly and heteroatomic anchoring of single indium atoms and few-atom indium clusters on graphene, EUROMAT 2021, Online, 2021, Oral Presentation, PRESENTED
L. MacEnulty and D. D. O'Regan, On using an auxiliary magnetic charge density to calculate the magnetostatic dipole-dipole correction to spin-density functional theory (DFT), EUROMAT 2021, Online, 2021, Oral Presentation, PRESENTED
D. D. O'Regan, O. K. Orhan, G. Moynihan, E. B. Linscott, D. J. Cole, and G. Teobaldi, The partner of the Hubbard U: interpretation of Hund's J in DFT+U methods, Psi-k School "Bridging First-Principles Calculations and Effective Hamiltonians", Online, hosted by IIT Genova, IT, 2021, Oral Presentation, PRESENTED
D. D. O'Regan, O. K. Orhan, E. B. Linscott, G. Moynihan, and G. Teobaldi, A linear-response approach for first-principles Hund's J parameters: insights, oxides, and self-consistency, APS March Meeting, Online and Chicago, IL, U.S.A., 2021, Oral Presentation, PRESENTED
D. P. Gavin and D. D. O'Regan, Quantum-mechanical computational screening and design of resilient plasmonic alloys for ICT and sensing, AMBER ICT Theme Meeting, Trinity College Dublin, IE, 2021, Oral Presentation, PRESENTED
L. MacEnulty and D. D. O'Regan, Hubbard U and Hund's Coupling J Parameters from First Principles: Towards accurate Heisenberg exchange coupling parameters for NiO, QUOROM-V, Online, 2021, Poster, PRESENTED
L. MacEnulty and D. D. O'Regan, Calculation of the Magnetostatic Dipole-Dipole Correction to Periodic Spin-Density Functional Theory Using an Auxiliary Magnetic Charge Density, Materials Research Society (MRS) MRS Spring Meeting and Exhibit, Online, 2021, Poster, PRESENTED


Page 1 of 11