Nonequilibrium DC Current Generation in a Driven Dissipative Haldane Model

Abstract

The interplay of topology with nonequilibrium driving and dissipation in open quantum systems has recently attracted significant interest in condensed matter physics. In this work, we investigate a driven, dissipative Haldane model using large-scale numerical simulations of Lindblad dynamics. We show that the system evolves into a time-periodic quasi-steady state when subjected to driving and dissipation, with nonequilibrium band occupations. To characterize this regime, we introduce an occupation-weighted Chern number as a nonquantized diagnostic constructed from the steady-state occupations and the geometry of the unperturbed bands. We further analyze charge transport in the presence of simultaneous driving and damping and demonstrate that a finite DC bulk current emerges when inversion symmetry is broken by a staggered sublattice potential. The magnitude and direction of this current are controlled by the driving amplitude, revealing a tunable nonequilibrium transport response enabled by inversion-symmetry breaking.