Overview

I am a Royal Society University Research Fellow and Proleptic Lecturer in Physics, working in the Quantum Systems and Nanomaterials group and the Centre for Metamaterial Research and Innovation.

For more details, see cadowning.com.

Research Interests

• condensed matter theory
• metamaterials
• nanophotonics
• quantum optics
• plasmonics

Education and Employment

• 2022 - present: Royal Society University Research Fellow [Senior Research Fellow] and Proleptic Lecturer, University of Exeter
• 2020 - 2022: Royal Society University Research Fellow [Research Fellow] and Proleptic Lecturer, University of Exeter
• 2018 - 2020: Juan de la Cierva Fellow, Universidad de Zaragoza
• 2017 - 2018: Postdoctoral Researcher, Universidad Autónoma de Madrid
• 2015 - 2017: Postdoctoral Researcher, Université de Strasbourg
• 2015: PhD in Physics, University of Exeter

Funded Research Projects

• 2020 - present: University Research Fellowship, Royal Society
• 2018 - 2020: Juan de la Cierva Fellowship, CSIC

Publications

• Google Scholar: Charles A. Downing 
• ORCID: 0000-0002-0058-9746
• Scopus Author ID: 54083065200
• Web of Science ResearcherID: K-8942-2019

Memberships

• American Physical Society
• Institute of Physics
• Mediterranean Institute of Fundamental Physics

Contributions to the Community

• Advisory Board of the Journal of Physics: Condensed Matter
• Referee for international journals

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Publications

_{Copyright Notice: Any articles made available for download are for personal use only. Any other use requires prior permission of the author and the copyright holder.}

| 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 |

2024

• Downing CA, Ukhtary MS. (2024) Hyperbolic enhancement of a quantum battery, Phys. Rev. A, volume 109. [PDF]
• Ukhtary MS, Downing C, Nugraha ART, Cahaya AB, Rusydi A, Majidi A. (2024) High-performance quantum battery with non-linearities, Quantum Technologies 2024, DOI:10.1117/12.3027080.
• Downing CA, Ukhtary MS. (2024) Hyperbolic enhancement of a quantum battery, Physical Review A, volume 109, no. 5, article no. 052206, DOI:10.1103/physreva.109.052206. [PDF]
• Downing CA, Ukhtary MS. (2024) Energetics of a pulsed quantum battery, EPL, volume 146. [PDF]
• Downing CA, Ukhtary MS. (2024) Energetics of a pulsed quantum battery, Europhysics Letters, volume 146, no. 1, pages 10001-10001, DOI:10.1209/0295-5075/ad2e79. [PDF]

2023

• Downing CA. (2023) Exceptional points in nanophotonics*, 2023 IEEE Nanotechnology Materials and Devices Conference (NMDC), DOI:10.1109/nmdc57951.2023.10344246.
• Downing CA, Portnoi ME. (2023) Quantum confinement in Dirac-like nanostructures, Encyclopedia of Condensed Matter Physics (Second Edition) Volume 2, 2024, Pages 344-349. [PDF]
• Downing CA, Ukhtary MS. (2023) A quantum battery with quadratic driving, Communications Physics, volume 6, no. 1, article no. 322, DOI:10.1038/s42005-023-01439-y. [PDF]
• Downing CA, Ukhtary MS. (2023) A quantum battery with quadratic driving, Commun. Phys, volume 6. [PDF]
• Downing CA, Fox OIR. (2023) Unbalanced gain and loss in a quantum photonic system, J. Opt, volume 25. [PDF]
• Downing CA, Reuben Fox OI. (2023) Unbalanced gain and loss in a quantum photonic system, Journal of Optics, volume 25, no. 9, pages 095201-095201, DOI:10.1088/2040-8986/ace5be. [PDF]
• Downing CA, Vidiella-Barranco A. (2023) Parametrically driving a quantum oscillator into exceptionality, Sci. Rep, volume 13. [PDF]
• Downing CA, Vidiella-Barranco A. (2023) Parametrically driving a quantum oscillator into exceptionality, Scientific Reports, volume 13, no. 1, article no. 11004, DOI:10.1038/s41598-023-37964-7. [PDF]
• Downing CA, del Valle E, Fernández-Domínguez AI. (2023) Resonance fluorescence of two asymmetrically pumped and coupled two-level systems, DOI:10.48550/arxiv.2302.09020.
• Downing CA, del Valle E, Fernández-Domínguez AI. (2023) Resonance fluorescence of two asymmetrically pumped and coupled two-level systems, Physical Review A, volume 107, no. 2, article no. 023717, DOI:10.1103/physreva.107.023717. [PDF]

2022

• Downing CA, Portnoi ME. (2022) Quantum confinement in Dirac-like nanostructures, Reference Module in Materials Science and Materials Engineering, Elsevier, DOI:10.1016/b978-0-323-90800-9.00074-3.
• Downing CA, Sturges TJ. (2022) Directionality between driven-dissipative resonators, EPL, volume 140. [PDF]
• Downing CA, Sturges TJ. (2022) Directionality between driven-dissipative resonators, Europhysics Letters, volume 140, no. 3, pages 35001-35001, DOI:10.1209/0295-5075/ac9ad6. [PDF]
• Downing CA, Toghill AJ. (2022) Quantum topology in the ultrastrong coupling regime, Sci. Rep, volume 12. [PDF]
• Downing CA, Toghill AJ. (2022) Quantum topology in the ultrastrong coupling regime, Scientific Reports, volume 12, no. 1, article no. 11630, DOI:10.1038/s41598-022-15735-0. [PDF]

2021

• Downing CA, Saroka VA. (2021) Exceptional points in oligomer chains, COMMUNICATIONS PHYSICS, volume 4, no. 1, article no. ARTN 254, DOI:10.1038/s42005-021-00757-3. [PDF]
• Downing CA, Saroka VA. (2021) Exceptional points in oligomer chains, Commun. Phys, volume 4. [PDF]
• Downing CA, Zueco D. (2021) Non-reciprocal population dynamics in a quantum trimer, Proc. R. Soc. A, volume 477. [PDF]
• Azcona PM, Downing CA. (2021) Doublons, topology and interactions in a one-dimensional lattice, DOI:10.48550/arxiv.2105.04406.
• Downing CA, Martín-Moreno L. (2021) Polaritonic Tamm states induced by cavity photons, Frontiers in Optics and Photonics, De Gruyter, 527-536, DOI:10.1515/9783110710687-040.
• Downing CA, Zueco D. (2021) Non-reciprocal population dynamics in a quantum trimer, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, volume 477, no. 2255, DOI:10.1098/rspa.2021.0507. [PDF]
• Azcona PM, Downing CA. (2021) Doublons, topology and interactions in a one-dimensional lattice, Sci. Rep, volume 11. [PDF]
• Hernández-López L, Piquero-Zulaica I, Downing CA, Piantek M, Fujii J, Serrate D, Ortega JE, Bartolomé F, Lobo-Checa J. (2021) Searching for kagome multi-bands and edge states in a predicted organic topological insulator, Nanoscale, volume 13, no. 10, pages 5216-5223, DOI:10.1039/d0nr08558h. [PDF]

2020

• Downing CA, Carreño JCL, Fernández-Domínguez AI, del Valle E. (2020) Asymmetric coupling between two quantum emitters, DOI:10.48550/arxiv.2003.01050.
• Downing CA, Weick G. (2020) Plasmonic modes in cylindrical nanoparticles and dimers, DOI:10.48550/arxiv.2007.09095.
• Downing CA, Zueco D, Martín-Moreno L. (2020) Chiral current circulation and $\mathcal{PT}$ symmetry in a trimer of oscillators, DOI:10.48550/arxiv.2009.06620.
• Sturges TJ, Repän T, Downing CA, Rockstuhl C, Stobińska M. (2020) Extreme renormalisations of dimer eigenmodes by strong light-matter coupling, DOI:10.48550/arxiv.2010.11071.
• Downing CA, Zueco D, Martín-Moreno L. (2020) Chiral current circulation and $\mathcal{PT}$ symmetry in a trimer of oscillators, ACS Photonics, volume 7. [PDF]
• Downing CA, Weick G. (2020) Plasmonic modes in cylindrical nanoparticles and dimers, Proc Math Phys Eng Sci, volume 476, no. 2244, DOI:10.1098/rspa.2020.0530. [PDF]
• Downing CA, Martín-Moreno L. (2020) Polaritonic Tamm states induced by cavity photons, Nanophotonics, volume 10. [PDF]
• Sturges TJ, Repän T, Downing CA, Rockstuhl C, Stobińska M. (2020) Extreme renormalisations of dimer eigenmodes by strong light–matter coupling, New Journal of Physics, volume 22, no. 10, pages 103001-103001, DOI:10.1088/1367-2630/abb898. [PDF]
• Downing CA, Carreño JCL, Fernández-Domínguez AI, del Valle E. (2020) Asymmetric coupling between two quantum emitters, Physical Review A, volume 102, no. 1, article no. 013723, DOI:10.1103/physreva.102.013723. [PDF]

2019

• Downing CA, Portnoi ME. (2019) Trapping charge carriers in low-dimensional Dirac materials, DOI:10.48550/arxiv.1903.12465.
• Downing CA, Portnoi ME. (2019) Zero-energy vortices in Dirac materials, DOI:10.48550/arxiv.1903.09005.
• Collier TP, Alexeev AM, Downing CA, Kibis OV, Portnoi ME. (2019) Terahertz optoelectronics of quantum rings and nanohelices, DOI:10.48550/arxiv.1903.07342.
• Downing CA, Sturges TJ, Weick G, Stobińska M, Moreno LM. (2019) Topological phases of polaritons in a cavity waveguide, DOI:10.48550/arxiv.1907.02013.
• Downing CA, Sturges TJ, Weick G, Stobińska M, Martín-Moreno L. (2019) Topological Phases of Polaritons in a Cavity Waveguide, Physical Review Letters, volume 123, no. 21, article no. 217401, DOI:10.1103/physrevlett.123.217401. [PDF]
• Downing CA, Carreño JCL, Laussy FP, del Valle E, Fernández-Domínguez AI. (2019) Quasichiral Interactions between Quantum Emitters at the Nanoscale, Physical Review Letters, volume 122, no. 5, article no. 057401, DOI:10.1103/physrevlett.122.057401. [PDF]
• Collier TP, Saroka VA, Downing CA, Alexeev AM, Hartmann RR, Portnoi ME. (2019) Terahertz applications of non-simply-connected and helical nanostructures, NATO Science for Peace and Security Series B: Physics and Biophysics, 201-214, DOI:10.1007/978-94-024-1687-9_11.
• Downing CA, Portnoi ME. (2019) Trapping charge carriers in low-dimensional Dirac materials, Int. J. Nanosci, volume 18. [PDF]
• Downing CA, Portnoi ME. (2019) Zero-energy vortices in Dirac materials, Phys. Status Solidi B, volume 256. [PDF]

2018

• Downing CA, Weick G. (2018) Topological plasmons in dimerized chains of nanoparticles: robustness against long-range quasistatic interactions and retardation effects, DOI:10.48550/arxiv.1803.08872.
• Downing CA, Carreño JCL, Laussy FP, del Valle E, Fernández-Domínguez AI. (2018) Quasi-Chiral Interactions between Quantum Emitters at the Nanoscale, DOI:10.48550/arxiv.1807.07097.
• Downing CA, Weick G. (2018) Topological plasmons in dimerized chains of nanoparticles: robustness against long-range quasistatic interactions and retardation effects, The European Physical Journal B, volume 91, no. 10, article no. 253, DOI:10.1140/epjb/e2018-90199-0. [PDF]
• Collier TP, Alexeev AM, Downing CA, Kibis OV, Portnoi ME. (2018) Terahertz Optoelectronics of Quantum Rings and Nanohelices, Semiconductors, volume 52, no. 14, pages 1813-1816, DOI:10.1134/S1063782618140075.

2017

• Downing CA, Portnoi ME. (2017) Localization of massless Dirac particles via spatial modulations of the Fermi velocity, DOI:10.48550/arxiv.1706.02607.
• Downing CA, Mariani E, Weick G. (2017) Radiative frequency shifts in nanoplasmonic dimers, DOI:10.48550/arxiv.1705.04492.
• Downing CA, Mariani E, Weick G. (2017) Retardation effects on the dispersion and propagation of plasmons in metallic nanoparticle chains, DOI:10.48550/arxiv.1709.07770.
• Downing CA. (2017) Two-electron atom with a screened interaction, Physical Review A, volume 95, no. 2, article no. 022105, DOI:10.1103/physreva.95.022105. [PDF]
• Downing CA, Weick G. (2017) Topological collective plasmons in bipartite chains of metallic nanoparticles, Physical Review B, volume 95, no. 12, article no. 125426, DOI:10.1103/physrevb.95.125426. [PDF]
• Downing CA, Mariani E, Weick G. (2017) Retardation effects on the dispersion and propagation of plasmons in metallic nanoparticle chains, J. Phys.: Condens. Matter, volume 30. [PDF]
• Downing CA, Portnoi ME. (2017) Localization of massless Dirac particles via spatial modulations of the Fermi velocity, Journal of Physics: Condensed Matter, volume 29, no. 21, pages 315301-1-315301-8, article no. 315301, DOI:10.1088/1361-648X/aa7884.
• Downing CA, Mariani E, Weick G. (2017) Radiative frequency shifts in nanoplasmonic dimers, Phys. Rev. B, volume 96. [PDF]

2016

• Downing CA, Portnoi ME. (2016) Magnetic quantum dots and rings in two dimensions, DOI:10.48550/arxiv.1608.01522.
• Downing CA, Portnoi ME. (2016) Massless Dirac fermions in two dimensions: Confinement in nonuniform magnetic fields, DOI:10.48550/arxiv.1610.03032.
• Downing CA, Robinson MG, Portnoi ME. (2016) Nanohelices as superlattices: Bloch oscillations and electric dipole transitions, DOI:10.48550/arxiv.1610.04186.
• Brandstetter-Kunc A, Weick G, Downing CA, Weinmann D, Jalabert RA. (2016) Nonradiative limitations to plasmon propagation in chains of metallic nanoparticles, DOI:10.48550/arxiv.1607.02999.
• Brandstetter-Kunc A, Weick G, Downing CA, Weinmann D, Jalabert RA. (2016) Publisher's Note: Nonradiative limitations to plasmon propagation in chains of metallic nanoparticles [Phys. Rev. B 94, 205432 (2016)], Physical Review B, volume 94, no. 23, DOI:10.1103/physrevb.94.239902.
• Downing CA, Weick G. (2016) Topological collective plasmons in bipartite chains of metallic nanoparticles, DOI:10.48550/arxiv.1611.03349.
• Brandstetter-Kunc A, Weick G, Downing CA, Weinmann D, Jalabert RA. (2016) Nonradiative limitations to plasmon propagation in chains of metallic nanoparticles, Physical Review B, volume 94, no. 20, article no. 205432, DOI:10.1103/physrevb.94.205432. [PDF]
• Downing CA, Portnoi ME. (2016) Massless Dirac fermions in two dimensions: Confinement in nonuniform magnetic fields, Physical Review B - Condensed Matter and Materials Physics, volume 94, no. 16, pages 165407-1-165407-6, article no. 165407, DOI:10.1103/PhysRevB.94.165407.
• Downing CA, Robinson MG, Portnoi ME. (2016) Nanohelices as superlattices: Bloch oscillations and electric dipole transitions, Physical Review B - Condensed Matter and Materials Physics, volume 94, no. 15, pages 155306-1-155306-8, article no. 155306, DOI:10.1103/PhysRevB.94.155306.
• Downing CA, Portnoi ME. (2016) Magnetic quantum dots and rings in two dimensions, Physical Review B: Condensed Matter and Materials Physics, volume 94, no. 4, pages 045430-1-045430-8, article no. 045430, DOI:10.1103/PhysRevB.94.045430.
• Downing CA, Robinson MG, Portnoi ME. (2016) Electromagnetic Properties of Nanohelices, Fundamental and Applied Nano-Electromagnetics, Springer, 27-44, DOI:10.1007/978-94-017-7478-9_2. [PDF]

2015

• Downing CA, Portnoi ME. (2015) Bielectron vortices in two-dimensional Dirac semimetals, DOI:10.48550/arxiv.1506.04425.
• Downing CA, Pearce AR, Churchill RJ, Portnoi ME. (2015) Optimal traps in graphene, DOI:10.48550/arxiv.1503.08200.
• Downing CA, Portnoi ME. (2015) Bielectron vortices in two-dimensional Dirac semimetals, Nat. Commun, volume 8. [PDF]
• Downing CA, Pearce AR, Churchill RJ, Portnoi ME. (2015) Optimal traps in graphene, Phys. Rev. B, volume 92. [PDF]

2014

• Downing CA, Portnoi ME. (2014) One-dimensional coulomb problem in dirac materials, Physical Review A - Atomic, Molecular, and Optical Physics, volume 90, no. 5, DOI:10.1103/PhysRevA.90.052116.

2013

• Downing CA. (2013) On a solution of the Schrödinger equation with a hyperbolic double-well potential, Journal of Mathematical Physics, volume 54, no. 7, DOI:10.1063/1.4811855.
• Portnoi ME, Downing CA, Hartmann RR, Shelykh IA. (2013) Excitons and interband terahertz transitions in narrow-gap carbon nanotubes, Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013, pages 231-234, DOI:10.1109/ICEAA.2013.6632229.

2012

• Stone DA, Downing CA, Portnoi ME. (2012) Searching for confined modes in graphene channels: The variable phase method, Physical Review B - Condensed Matter and Materials Physics, volume 86, no. 7, DOI:10.1103/PhysRevB.86.075464.

2011

• Downing CA, Stone DA, Portnoi ME. (2011) Zero-energy states in graphene quantum dots and rings, PHYSICAL REVIEW B, volume 84, no. 15, article no. ARTN 155437, DOI:10.1103/PhysRevB.84.155437. [PDF]

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