Geometric pumping and dephasing at topological phase transition
Date
2022-01-03
Authors
Song, B.Q.
Smith, J.D.H.
Luo, L.
Wang, J.
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Advisor
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Publisher
Iowa State University Digital Repository, Ames IA (United States)
Abstract
A measure-preserving formalism (MPF) is constructed and applied to spin/band models, which yield observations about pumping. It occurs at the topological phase transition, i.e., a Z2 flip, suggesting that Z2 can imply bulk effects. The model's asymptotic behavior is analytically solved via MPF. The pumping probability is geometric, fractional, and has a ceiling of 21. Intriguingly, theorems are proved about occurrence conditions, which are linked to the system's dimension and the distinction between rational and irrational numbers. Experimental detection is discussed.
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IS-J 10692
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article
Comments
This article is published as Song, B. Q., J. D. H. Smith, L. Luo, and J. Wang. "Geometric pumping and dephasing at topological phase transition." Physical Review B 105, no. 3 (2022): 035101.
DOI: 10.1103/PhysRevB.105.035101.
Copyright 2022 American Physical Society.
DOE Contract Number(s): AC02-07CH11358.
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