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Arindam, Mallick
복잡계 이론물리 연구단
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Spectral magnetization ratchets with discrete-time quantum walks

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Title
Spectral magnetization ratchets with discrete-time quantum walks
Author(s)
Arindam Mallick; Mikhail Fistul; P. Kaczynska; Sergej Flach
Subject
TRANSPORT
Publication Date
2020-03
Journal
PHYSICAL REVIEW A, v.101, no.3, pp.032119
Publisher
AMER PHYSICAL SOC
Abstract
© 2020 American Physical Society. We predict and theoretically study in detail the ratchet effect for the spectral magnetization of periodic discrete-time quantum walks (DTQWs)-a repetition of a sequence of m different DTQWs. These generalized DTQWs are achieved by varying the corresponding coin operator parameters periodically with discrete time. We consider periods m = 1, 2, and 3. The dynamics of m-periodic DTQWs is characterized by a two-band dispersion relation omega((m))(+/-)(k), where k is the wave vector. We identify a generalized parity symmetry of m-periodic DTQWs. The symmetry can be broken for m = 2 and 3 by proper choices of the coin operator parameters. The obtained symmetry breaking results in a ratchet effect, i.e., the appearance of a nonzero spectral magnetization M-s(omega). This ratchet effect can be observed in the framework of continuous quantum measurements of a time-dependent correlation function of periodic DTQWs
URI
https://pr.ibs.re.kr/handle/8788114/8717
DOI
10.1103/PhysRevA.101.032119
ISSN
2469-9926
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > 1. Journal Papers (저널논문)
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