5 papers
Topological phases of the Bogoliubov de Gennes Hamiltonian
Klaus Ziegler
We investigate a two-dimensional superconducting system with a smoothly and periodically varying order parameter. The order parameter is modulated along one direction while remaini…
Phonon mode splitting and phonon anomaly in multiband electron systems
Klaus Ziegler
We investigate the topological consequences of coupling chiral fermions to local, dispersionless phonons. This interaction induces a splitting of the phonon spectrum into three ban…
Enhanced polariton interaction in the presence of disorder
Matthew Prest, Cassandra Imperato, Oleg L. Berman +2
We consider the interaction between exciton-polaritons in a semiconductor quantum well, embedded in a microcavity, in the presence of disorder. The disorder acts on the excitons in…
Stability of the Mott phase in excitonic double layers
K. Ziegler, R. Ya. Kezerashvili
We study the stability of excitonic Mott phases in the presence of a periodic potential and a non-local exciton-exciton interaction. The non-local interaction is treated in a mean-…
Analytic bulk-edge connection in circular-symmetric models
Klaus Ziegler
We propose a systematic analysis of the eigenfunctions of two-band systems in two dimensions with a circular edge. Our approach is based on an analytic continuation of the wavenumb…