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Strong interlayer charge transfer due to exciton condensation in an electrically isolated GaAs quantum well bilayer

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Title
Strong interlayer charge transfer due to exciton condensation in an electrically isolated GaAs quantum well bilayer
Author(s)
Joonho Jang; Yoo, Heun Mo; Pfeiffer, L.N.; West, K.W.; Baldwin, K.W.; Ashoori, Raymond C.
Subject
PHASE, ; SPECTROSCOPY, ; GRAPHENE
Publication Date
2021-05-17
Journal
APPLIED PHYSICS LETTERS, v.118, no.20
Publisher
American Institute of Physics Inc.
Abstract
© 2021 Author(s).We introduce a design of electrically isolated "floating"bilayer GaAs quantum wells (QW), in which application of a large gating voltage controllably and highly reproducibly induces charges that remain trapped in the bilayer after removal of the gating voltage. At smaller gate voltages, the bilayer is fully electrically isolated from external electrodes by thick insulating barriers. This design permits full control of the total and differential densities of two coupled 2D electron systems. The floating bilayer design provides a unique approach for studying systems inaccessible by simple transport measurements. It also provides the ability to measure the charge transfer between the layers, even when the in-plane resistivities of the 2D systems diverge. We measure the capacitance and inter-layer tunneling spectra of the QW bilayer with independent control of the top and bottom layer electron densities. Our measurements display strongly enhanced inter-layer tunneling current at v T = 1, a signature of exciton condensation of a strongly interlayer-correlated bilayer system. With fully tunable densities of individual layers, the floating bilayer QW system provides a versatile platform to access previously unavailable information on the quantum phases in electron bilayer systems.
URI
https://pr.ibs.re.kr/handle/8788114/10001
DOI
10.1063/5.0049595
ISSN
0003-6951
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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