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복잡계 이론물리 연구단
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Anomalous transport in a topological Wannier-Stark ladder

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Title
Anomalous transport in a topological Wannier-Stark ladder
Author(s)
Kun Woo Kim; Alexei Andreanov; Sergej Flach
Subject
ELECTRIC FIELD EFFECTS, ; STARK EFFECT, ; TOPOLOGICAL PHASE TRANSITION, ; STRONG-FIELD-INDUCED SPECTRA
Publication Date
2020-04
Journal
Physical review research, v.2, no.2, pp.023067
Publisher
AMER PHYSICAL SOC
Abstract
ⓒAmerican physical society. A dc (e.g., electric) field with commensurate lattice direction turns a single-particle band structure in d = 3 dimensions into an infinite set of equally spaced irreducible (d − 1) = 2-dimensional Wannier-Stark (WS) band structures that are spatially localized along the field direction. Particle transport is expected to be suppressed once the WS bands are gapped in energy. The topological character of the irreducible band structure leads to one-dimensional sets of boundary states which fill the energy gaps. As a result, eigenmodes are smoothly connected in energy and space and yield anomalous particle transport throughout the ladder. The number of chiral boundary modes can be tuned by the dc field strength and manifests through the distribution of dissipated energy and spatial motion, and the temperature dependence of angular momentum carried by particles.
URI
https://pr.ibs.re.kr/handle/8788114/8641
DOI
10.1103/PhysRevResearch.2.023067
ISSN
2643-1564
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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