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Pseudo-Hydrodynamic Flow of Quasiparticles in Semimetal WTe2 at Room Temperature

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Title
Pseudo-Hydrodynamic Flow of Quasiparticles in Semimetal WTe2 at Room Temperature
Author(s)
Choi, Young-Gwan; Doan, Manh-Ha; Ngoc, Luu Ly Pham; Lee, Junsu; Gyung-Min Choi; Chernodub, Maxim Nikolaevich
Publication Date
2023-07
Journal
Small, v.19, no.27
Publisher
John Wiley and Sons Inc
Abstract
Copyright © 1999-2023 John Wiley & Sons, Inc. All rights reserved. Recently, much interest has emerged in fluid-like electric charge transport in various solid-state systems. The hydrodynamic behavior of the electronic fluid reveals itself as a decrease of the electrical resistance with increasing temperature (the Gurzhi effect) in narrow channels, polynomial scaling of the resistance as a function of the channel width, violation of the Wiedemann–Franz law supported by the emergence of the Poiseuille flow. Similar to whirlpools in flowing water, the viscous electronic flow generates vortices, resulting in abnormal sign-changing electrical response driven by backflow. However, the question of whether the long-ranged sign-changing electrical response can be produced by a mechanism other than hydrodynamics has not been addressed so far. Here polarization-sensitive laser microscopy is used to demonstrate the emergence of visually similar abnormal sign-alternating patterns in semi-metallic tungsten ditelluride at room temperature where this material does not exhibit true hydrodynamics. It is found that the neutral quasiparticle current consisting of electrons and holes obeys an equation remarkably similar to the Navier–Stokes equation. In particular, the momentum relaxation is replaced by the much slower process of quasiparticle recombination. This pseudo-hydrodynamic flow of quasiparticles leads to a sign-changing charge accumulation pattern via different diffusivities of electrons and holes. © 2023 Wiley-VCH GmbH.
URI
https://pr.ibs.re.kr/handle/8788114/13712
DOI
10.1002/smll.202206604
ISSN
1613-6810
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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