RT Journal Article
T1 Robust nonequilibrium edge currents with and without band topology
A1 Mitchison, Mark
A1 Rivas Vargas, Ángel
A1 Martín-Delgado Alcántara, Miguel Ángel
AB We study two-dimensional bosonic and fermionic lattice systems under nonequilibrium conditions corresponding to a sharp gradient of temperature imposed by two thermal baths. In particular, we consider a lattice model with broken time-reversal symmetry that exhibits both topologically trivial and nontrivial phases. Using a nonperturbative Green function approach, we characterize the nonequilibrium current distribution in different parameter regimes. For both bosonic and fermionic systems, we find chiral edge currents that are robust against coupling to reservoirs and to the presence of defects on the boundary or in the bulk. This robustness not only originates from topological effects at zero temperature but, remarkably, also persists as a result of dissipative symmetries in regimes where band topology plays no role. Chirality of the edge currents implies that energy locally flows against the temperature gradient without any external work input. In the fermionic case, there is also a regime with topologically protected boundary currents, which nonetheless do not circulate around all system edges.
PB American Physical Society
YR 2022
FD 2022
LK https://hdl.handle.net/20.500.14352/88981
UL https://hdl.handle.net/20.500.14352/88981
LA eng
NO M. T. Mitchison, Á. Rivas, and M. A. Martin-Delgado, Phys. Rev. Lett. 128, 120403 (2022).
NO European Commission
NO Ministerio de Economía, Comercio y Empresa (España)
NO Comunidad de Madrid
NO U.S. Army Research Office
DS Docta Complutense
RD 18 abr 2025