Subradiant edge states in an atom chain with waveguide-mediated hopping

Strong hybridization of edge and bulk states in dimerized PT-symmetric coupled waveguide chain.

We study mode coupling of an edge state with bulk states in a coupled waveguide chain in the presence of gain and losses. In a low non-Hermiticity regime, it is found that the edge state associated with the interface between two topologically different waveguide chains is well isolated from the bulk states, sharing the exact same features as the well-known Su-Schrieffer-Heeger Model. As the non...

Atom-atom interactions around the band edge of a photonic crystal waveguide.

Tailoring the interactions between quantum emitters and single photons constitutes one of the cornerstones of quantum optics. Coupling a quantum emitter to the band edge of a photonic crystal waveguide (PCW) provides a unique platform for tuning these interactions. In particular, the cross-over from propagating fields [Formula: see text] outside the bandgap to localized fields [Formula: see tex...

Direct imaging of topological edge states in cold-atom systems.

Detecting topological order in cold-atom experiments is an ongoing challenge, the resolution of which offers novel perspectives on topological matter. In material systems, unambiguous signatures of topological order exist for topological insulators and quantum Hall devices. In quantum Hall systems, the quantized conductivity and the associated robust propagating edge modes--guaranteed by the ex...

Disorder-driven transition in a chain with power-law hopping

h-pairing superconductivity in the Hubbard chain with pair hopping

G. I. Japaridze, A. P. Kampf, M. Sekania, P. Kakashvili, and Ph. Brune Institut für Physik, Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, 86135 Augsburg, Germany Institute of Physics, Georgian Academy of Sciences, Guramishvili Str. 6, 380077, Tbilisi, Georgia Department of Physics, Tbilisi State University, Chavchavadze Ave. 3, 380028, Tbilisi, Geor...