Room-Temperature Mesoscopic Fluctuations and Coulomb Drag in Multilayer WSe2

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Title
Room-Temperature Mesoscopic Fluctuations and Coulomb Drag in Multilayer WSe2
Author(s)
Doan Manh-Ha; Youngjo Jin; Tuan Khanh Chau; Min-Kyu Joo; Young Hee Lee
Publication Date
2019-04
Journal
ADVANCED MATERIALS, v.31, no.17, pp.1900154 -
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Mesoscopic fluctuations, manifesting the quantum interference (QI) of electrons, have been theoretically proposed in bilayer Coulomb drag systems. Unfortunately, these phenomena are usually observed at cryogenic temperatures, which severely limits their novel physics for pragmatic applications. In this paper, observation of room-temperature QI and Coulomb drag in a multilayer WSe2 transistor is reported via graphene contacts separately at its top and bottom layers. The central layers of WSe2 act as an insulating region with a width of few nanometers, which spatially separates the top and bottom conducting channels and provides a strong Coulomb interaction between them, leading to large conductance oscillations at room temperature. The gradual suppression of the oscillations with the increase in the applied magnetic field and/or injected current further confirms the QI phenomenon. With the decrease in temperature, the Coulomb drag effect is exhibited in the system owing to the increased thickness of the insulating region. This study reveals a novel approach for realization of advanced quantum electronics operating at high temperatures. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
URI
https://pr.ibs.re.kr/handle/8788114/5990
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > Journal Papers (저널논문)
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