Quantum response theory for open systems and its application to Hall conductance
arXiv:1505.01556 · doi:10.1103/PhysRevE.92.052122
Abstract
Quantum linear response theory considers only the response of a closed quantum system to a perturbation up to first order in the perturbation. This theory breaks down when the system subjects to environments and the response up to second order in perturbation is not negligible. In this paper, we develop a quantum nonlinear response theory for open systems. We first formulate this theory in terms of general susceptibility, then apply it to deriving the Hall conductance for the open system at finite temperature. Taking the two-band model as an example, we derive the Hall conductance for the two-band model. We calculate the Hall conductance for a two-dimensional ferromagnetic electron gas and a two-dimensional lattice model via different expressions for . The results show that the transition points of topological phase almost remain unchanged in the presence of environments.
10 pages, 6 figures
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