Magnetoconductance of Independently Tunable Tunnel-Coupled Double Quantum Wires

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The authors report on their recent experimental studies of vertically-coupled quantum point contacts subject to in-plane magnetic fields. Using a novel flip-chip technique, mutually aligned split gates on both sides of a sub micron thick double quantum well heterostructure define a closely-coupled pair of ballistic one-dimensional (1D) constrictions. They observe quantized conductance steps due to each quantum well and demonstrate independent control of each ID constriction width. In addition, a novel magnetoconductance feature at {approximately}6 T is observed when a magnetic field is applied perpendicular to both the current and growth directions. This conductance dip is observed only when 1D ... continued below

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4 p.

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BLOUNT,MARK A.; MOON,J.S.; SIMMONS,JERRY A.; LYO,SUNGKWUN K.; WENDT,JOEL R. & RENO,JOHN L. July 13, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The authors report on their recent experimental studies of vertically-coupled quantum point contacts subject to in-plane magnetic fields. Using a novel flip-chip technique, mutually aligned split gates on both sides of a sub micron thick double quantum well heterostructure define a closely-coupled pair of ballistic one-dimensional (1D) constrictions. They observe quantized conductance steps due to each quantum well and demonstrate independent control of each ID constriction width. In addition, a novel magnetoconductance feature at {approximately}6 T is observed when a magnetic field is applied perpendicular to both the current and growth directions. This conductance dip is observed only when 1D subbands are populated in both the top and bottom constrictions. This data is consistent with a counting model whereby the number of subbands crossing the Fermi level changes with field due to the formation of an anticrossing in each pair of 1D subbands.

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4 p.

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OSTI as DE00759896

Medium: P; Size: 4 pages

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  • Journal Name: Physica E; Other Information: Submitted to Physica E

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  • Report No.: SAND2000-1644J
  • Grant Number: AC04-94AL85000
  • DOI: 10.1016/S1386-9477(99)00174-5 | External Link
  • Office of Scientific & Technical Information Report Number: 759896
  • Archival Resource Key: ark:/67531/metadc703427

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  • July 13, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 8:14 p.m.

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BLOUNT,MARK A.; MOON,J.S.; SIMMONS,JERRY A.; LYO,SUNGKWUN K.; WENDT,JOEL R. & RENO,JOHN L. Magnetoconductance of Independently Tunable Tunnel-Coupled Double Quantum Wires, article, July 13, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc703427/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.