113 citations · 971 across the 28 of their papers we have counts for
19 papers · 1 filter
Exceptional points in oligomer chains
C. A. Downing, V. A. Saroka
Symmetry underpins our understanding of physical law. Open systems, those in contact with their environment, can provide a platform to explore parity-time symmetry. While classical…
Non-reciprocal population dynamics in a quantum trimer
C. A. Downing, D. Zueco
We study a quantum trimer of coupled two-level systems beyond the single-excitation sector, where the coherent coupling constants are ornamented by a complex phase. Accounting for…
Doublons, topology and interactions in a one-dimensional lattice
P. Martínez Azcona, C. A. Downing
We investigate theoretically the Bose-Hubbard version of the celebrated Su-Schrieffer-Heeger topological model, which essentially describes a one-dimensional dimerized array of cou…
Extreme renormalisations of dimer eigenmodes by strong light-matter coupling
Thomas J. Sturges, Taavi Repän, Charles A. Downing +2
We explore by theoretical means an extreme renormalisation of the eigenmodes of a dimer of dipolar meta-atoms due to strong light-matter interactions. Firstly, by tuning the height…
Chiral current circulation and symmetry in a trimer of oscillators
Charles A. Downing, David Zueco, Luis Martín-Moreno
We present a simple quantum theory of a bosonic trimer in a triangular configuration, subject to gain and loss in an open quantum systems approach. Importantly, the coupling consta…
Plasmonic modes in cylindrical nanoparticles and dimers
Charles A. Downing, Guillaume Weick
We present analytical expressions for the resonance frequencies of the plasmonic modes hosted in a cylindrical nanoparticle within the quasistatic approximation. Our theoretical mo…