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Strongly confined tunnel-coupled one-dimensional electron systems from an asymmetric double quantum well

✍ Scribed by S.S. Buchholz; S.F. Fischer; U. Kunze; D. Schuh; G. Abstreiter

Publisher: Elsevier Science
Year: 2008
Tongue: English
Weight: 305 KB
Volume: 40
Category: Article
ISSN: 1386-9477
DOI: 10.1016/j.physe.2007.09.038

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✦ Synopsis

Vertically stacked quantum point contacts (QPCs) are prepared by atomic force microscope (AFM) lithography from an asymmetric GaAs/AlGaAs double quantum well (DQW) heterostructure. Top-and back-gate voltages are used to tune the tunnel-coupled QPCs, and back-gate bias cooling is employed to investigate coupled and decoupled one-dimensional (1D) modes. Parity dependent mode coupling is invoked by the particular asymmetry in the vertical DQW confinement.