#### Papers

**2020**

[23] C. A. Downing, D. Zueco, and L. Martín-Moreno

*Chiral current circulation and PT symmetry in a trimer of oscillators*

[22] T. J. Sturges, T. Repän, C. A. Downing, C. Rockstuhl and M. Stobińska

*Extreme renormalisations of dimer eigenmodes by strong light-matter coupling*

New J. Phys. **22**, 103001 (2020)

[21] C. A. Downing and L. Martín-Moreno

*Polaritonic Tamm states induced by cavity photons*

[20] C. A. Downing, J. C. López Carreño, A. I. Fernández-Domínguez and E. del Valle

*Asymmetric coupling between two quantum emitters*

Phys. Rev. A **102**, 013723 (2020)

**2019**

[19] C. A. Downing, T. J. Sturges, G. Weick, M. Stobińska and L. Martín-Moreno

*Topological phases of polaritons in a cavity waveguide*

Phys. Rev. Lett. **123**, 217401 (2019)

[18] C. A. Downing and M. E. Portnoi

*Zero-energy vortices in Dirac materials*

Phys. Status Solidi B **256**, 1800584 (2019)

[17] C. A. Downing, J. C. López Carreño, F. P. Laussy, E. del Valle and A. I. Fernández-

Domínguez

*Quasichiral interactions between quantum emitters at the nanoscale*

Phys. Rev. Lett. **122**, 057401 (2019)

**2018**

[16] C. A. Downing and G. Weick

*Topological plasmons in dimerized chains of nanoparticles: robustness against longrangequasistatic interactions and retardation effects*

Eur. Phys. J. B **91**, 253 (2018)

[15] C. A. Downing, E. Mariani and G. Weick

*Retardation effects on the dispersion and propagation of plasmons in metallic nanoparticlechains*

J. Phys.: Condens. Matter **30**, 025301 (2018)

**2017**

[14] C. A. Downing and M. E. Portnoi

*Bielectron vortices in two-dimensional Dirac semimetals*

[13] C. A. Downing, E. Mariani and G. Weick

*Radiative shifts in nanoplasmonic dimers*

Phys. Rev. B **96**, 155421 (2017)

[12] C. A. Downing and M. E. Portnoi

*Localization of massless Dirac particles via spatial modulations of the Fermi velocity*

J. Phys.: Condens. Matter **29**, 315301 (2017)

[11] C. A. Downing and G. Weick

*Topological collective plasmons in bipartite chains of metallic nanoparticles*

Phys. Rev. B **95**, 125426 (2017)

[10] C. A. Downing

*Two-electron atom with a screened interaction*

Phys. Rev. A **95**, 022105 (2017)

**2016**

[9] A. Brandstetter-Kunc, G. Weick, C. A. Downing, D. Weinmann and R. A. Jalabert

*Nonradiative limitations to plasmon propagation in chains of metallic nanoparticles*

Phys. Rev. B **94**, 205432 (2016)

[8] C. A. Downing, M. G. Robinson and M. E. Portnoi

*Nanohelices as superlattices: Bloch oscillations and electric dipole transitions*

Phys. Rev. B **94**, 155306 (2016)

[7] C. A. Downing and M. E. Portnoi

*Massless Dirac fermions in two dimensions: Confinement in nonuniform magneticfields*

Phys. Rev. B **94**, 165407 (2016)

[6] C. A. Downing and M. E. Portnoi

*Magnetic quantum dots and rings in two-dimensions*

Phys. Rev. B **94**, 045430 (2016)

**2015**

[5] C. A. Downing, A. R. Pearce, R. J. Churchill and M. E. Portnoi

*Optimum traps in graphene*

Phys. Rev. B **92**, 165401 (2015)

**2014**

[4] C. A. Downing and M. E. Portnoi

*One-dimensional Coulomb problem in Dirac materials*

Phys. Rev. A **90**, 052116 (2014)

**2013**

[3] C. A. Downing

*On a solution of the Schrödinger equation with a hyperbolic double-well potential*

J. Math. Phys. **54**, 072101 (2013)

**2012**

[2] D. A. Stone, C. A. Downing and M. E. Portnoi

*Searching for confined modes in graphene channels: The variable phase method*

Phys. Rev. B **86**, 075464 (2012)

**2011**

[1] C. A. Downing, D. A. Stone and M. E. Portnoi

*Zero-energy states in graphene quantum dots and rings*

Phys. Rev. B **84**, 155437 (2011)

**Conference publications**

[3] C. A. Downing and M. E. Portnoi

*Trapping charge carriers in low-Dimensional Dirac materials*

Int. J. Nanosci. **18**, 1940001 (2019)

[2] T. P. Collier, A. M. Alexeev, C. A. Downing, O. V. Kibis and M. E. Portnoi

*Terahertz optoelectronics of quantum rings and nanohelices*

Semiconductors **52**, 1813 (2018)

[1] M. E. Portnoi, C. A. Downing, R. R. Hartmann and I. A. Shelykh

*Excitons and interband terahertz transitions in narrow-gap carbon nanotubes*

IEEE Xplore International Conference on Electromagnetics in Advanced Applications,

231-234, (2013)

**Book chapters**

[2] T. P. Collier, V. A Saroka, C. A. Downing, A. M. Alexeev, R. R. Hartmann and

M. E. Portnoi

*Terahertz applications of non-simply-connected and helical nanostructures*

Fundamental and Applied Nano-Electromagnetics II

[1] C. A. Downing, M. G. Robinson and M. E. Portnoi

Electromagnetic properties of nanohelices