59 citations · 190 across the 9 of their papers we have counts for
8 papers · 1 filter
Quantum confinement in Dirac-like nanostructures
C. A. Downing, M. E. Portnoi
In Westminster Abbey, in a nave near to Newton's monument, lies a memorial stone to Paul Dirac. The inscription on the stone includes the relativistic wave equation for an electron…
Tunable chiral anomalies and coherent transport on a honeycomb lattice
Vasil A. Saroka, Fanmiao Kong, Charles A. Downing +4
The search for energy efficient materials is urged not only by the needs of modern electronics but also by emerging applications in neuromorphic computing and artificial intelligen…
Asymmetric coupling between two quantum emitters
C. A. Downing, J. C. López Carreño, A. I. Fernández-Domínguez +1
We study a prototypical model of two coupled two-level systems, where the competition between coherent and dissipative coupling gives rise to a rich phenomenology. In particular, w…
Zero-energy vortices in Dirac materials
C. A. Downing, M. E. Portnoi
In this brief review, we survey the problem of electrostatic confinement of massless Dirac particles, via a number of exactly solvable one- and two-body models. By considering boun…
Localization of massless Dirac particles via spatial modulations of the Fermi velocity
C. A. Downing, M. E. Portnoi
The electrons found in Dirac materials are notorious for being difficult to manipulate due to the Klein phenomenon and absence of backscattering. Here we investigate how spatial mo…
Nanohelices as superlattices: Bloch oscillations and electric dipole transitions
C. A. Downing, M. G. Robinson, M. E. Portnoi
Subjecting a nanohelix to a transverse electric field gives rise to superlattice behavior with tunable electronic properties. We theoretically investigate such a system and find Bl…