Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevB.100.144303
Title: Revealing many-body effects on interband coherence through adiabatic charge pumping
Authors: Mu, Sen
Zhang, Da-Jian
Zhou, Longwen 
Gong, Jiangbin 
Keywords: Science & Technology
Technology
Physical Sciences
Materials Science, Multidisciplinary
Physics, Applied
Physics, Condensed Matter
Materials Science
Physics
QUANTUM
THERMALIZATION
DYNAMICS
CHAOS
Issue Date: 4-Oct-2019
Publisher: AMER PHYSICAL SOC
Citation: Mu, Sen, Zhang, Da-Jian, Zhou, Longwen, Gong, Jiangbin (2019-10-04). Revealing many-body effects on interband coherence through adiabatic charge pumping. PHYSICAL REVIEW B 100 (14). ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.100.144303
Abstract: © 2019 American Physical Society. The adiabatic charge pumping of a nonequilibrium state of spinless fermions in a one-dimensional lattice is investigated, with an emphasis placed on its usefulness in revealing many-body interaction effects on interband coherence. For a noninteracting system, the pumped charge per adiabatic cycle depends not only on the topology of the occupied bands but also on the interband coherence in the initial state. This insight leads to an interesting opportunity for quantitatively observing how quantum coherence is affected by many-body interaction that is switched on for a varying duration prior to adiabatic pumping. In particular, interband coherence effects can be clearly observed by adjusting the switch-on rates with different adiabatic pumping protocols and by scanning the duration of many-body interaction prior to adiabatic pumping. The time dependence of single-particle interband coherence in the presence of many-body interaction can then be examined in detail. As an interesting side result, for relatively weak interaction strength, it is found that the difference in the pumped charges between different pumping protocols vanishes if a coherence measure defined by the single-particle density matrix in the sublattice representation reaches its local minima. Our results hence provide an interesting means to quantitatively probe the dynamics of quantum coherence in the presence of many-body interaction (e.g., in a thermalization process).
Source Title: PHYSICAL REVIEW B
URI: https://scholarbank.nus.edu.sg/handle/10635/168513
ISSN: 2469-9950
2469-9969
DOI: 10.1103/PhysRevB.100.144303
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