paper

Phase Space Crystal Vibrations: Chiral Edge States with Preserved Time-reversal Symmetry

arXiv:2105.06989 · doi:10.1103/PhysRevB.105.094301

Abstract

It was recently discovered that atoms subject to a time-periodic drive can give rise to a crystal structure in phase space. In this work, we point out the atom-atom interactions give rise to collective phonon excitations of phase-space crystal via a pairing interaction with intrinsically complex phases that can lead to a phonon Chern insulator, accompanied by topologically robust chiral transport along the edge of the phase-space crystal. This topological phase is realized even in scenarios where the time-reversal transformation is a symmetry, which is surprising because the breaking of time-reversal symmetry is a strict precondition for topological chiral transport in the standard setting of real-space crystals. Our work has also important implications for the dynamics of 2D charged particles in a strong magnetic field.

19 pages, 6 figures; Supplemental video at https://owncloud.gwdg.de/index.php/s/VeQjlZwGoYNN7a4

References in corpus (8)

Cited by in corpus (8)