Interband coherence induced correction to Thouless pumping: possible observation in cold-atom systems

Gudapati Naresh Raghava, Longwen Zhou and Jiangbin Gong ()
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Gudapati Naresh Raghava: National University of Singapore
Longwen Zhou: National University of Singapore
Jiangbin Gong: National University of Singapore

The European Physical Journal B: Condensed Matter and Complex Systems, 2017, vol. 90, issue 8, 1-7

Abstract: Abstract In Thouless pump, the charge transport in a one-dimensional insulator over an adiabatic cycle is topologically quantized. For nonequilibrium initial states, however, interband coherence will induce a previously unknown contribution to Thouless pumping. Though not geometric in nature, this contribution is independent of the time scale of the pumping protocol. In this work, we perform a detailed analysis of our previous finding [H.L. Wang et al., Phys. Rev. B 91, 085420 (2015)] in an already available cold-atom setup. We show that initial states with interband coherence can be obtained via a quench of the system’s Hamiltonian. Adiabatic pumping in the post-quench system are then examined both theoretically and numerically, in which the interband coherence is shown to play an important role and can hence be observed experimentally. By choosing adiabatic protocols with different switching-on rates, we also show that the contribution of interband coherence to adiabatic pumping can be tuned. It is further proposed that the interband coherence induced correction to Thouless pumping may be useful in capturing a topological phase transition point. All our results have direct experimental interests.

Keywords: Mesoscopic; and; Nanoscale; Systems (search for similar items in EconPapers)
Date: 2017
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DOI: 10.1140/epjb/e2017-80195-3

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