Superradiance Induced Particle Flow via Dynamical Gauge Coupling.


Type
Article
Change log
Authors
Zheng, W 
Cooper, NR 
Abstract

We study fermions that are gauge coupled to a cavity mode via Raman-assisted hopping in a one-dimensional lattice. For an infinite lattice, we find a superradiant phase with an infinitesimal pumping threshold which induces a directed particle flow. We explore the fate of this flow in a finite lattice with boundaries, studying the nonequilibrium dynamics including fluctuation effects. The short-time dynamics is dominated by superradiance, while the long-time behavior is governed by cavity fluctuations. We show that the steady state in the finite lattice is not unique and can be understood in terms of coherent bosonic excitations above a Fermi surface in real space.

Description
Keywords
cond-mat.quant-gas, cond-mat.quant-gas
Journal Title
Phys Rev Lett
Conference Name
Journal ISSN
0031-9007
1079-7114
Volume Title
117
Publisher
American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/K030094/1)
This work was supported by EPSRC Grant No. EP/K030094/1.