Please use this identifier to cite or link to this item: https://doi.org/10.1140/epjb/e2017-80195-3
Title: Interband coherence induced correction to Thouless pumping: possible observation in cold-atom systems
Authors: Raghava, Gudapati Naresh
Zhou, Longwen 
Gong, Jiangbin 
Keywords: Science & Technology
Physical Sciences
Physics, Condensed Matter
Physics
ELECTRONS
STATES
Issue Date: 8-Aug-2017
Publisher: SPRINGER
Citation: Raghava, Gudapati Naresh, Zhou, Longwen, Gong, Jiangbin (2017-08-08). Interband coherence induced correction to Thouless pumping: possible observation in cold-atom systems. EUROPEAN PHYSICAL JOURNAL B 90 (8). ScholarBank@NUS Repository. https://doi.org/10.1140/epjb/e2017-80195-3
Abstract: © 2017, EDP Sciences, SIF, Springer-Verlag GmbH Germany. 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.
Source Title: EUROPEAN PHYSICAL JOURNAL B
URI: https://scholarbank.nus.edu.sg/handle/10635/167774
ISSN: 14346028
14346036
DOI: 10.1140/epjb/e2017-80195-3
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