Magnetoresistance of One-Dimensional Subbands in Tunnel-Coupled Double Quantum Wires

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We study the low-temperature in-plane magnetoresistance of tunnel-coupled quasi-one-dimensional quantum wires. The wires are defined by two pairs of mutually aligned split gates on opposite sides of a < 1 micron thick AlGaAs/GaAs double quantum well heterostructure, allowing independent control of their widths. In the ballistic regime, when both wires are defined and the field is perpendicular to the current, a large resistance peak at ~6 Tesla is observed with a strong gate voltage dependence. The data is consistent with a counting model whereby the number of subbands crossing the Fermi level changes with field due to the formation of ... continued below

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19 Pages

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Blount, M.A.; Lyo, S.K.; Moon, J.S.; Reno, J.L.; Simmons, J.A. & Wendt, J.R. April 27, 1999.

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

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Description

We study the low-temperature in-plane magnetoresistance of tunnel-coupled quasi-one-dimensional quantum wires. The wires are defined by two pairs of mutually aligned split gates on opposite sides of a < 1 micron thick AlGaAs/GaAs double quantum well heterostructure, allowing independent control of their widths. In the ballistic regime, when both wires are defined and the field is perpendicular to the current, a large resistance peak at ~6 Tesla is observed with a strong gate voltage dependence. The 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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19 Pages

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  • Journal Name: Physical Review B

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  • Other: DE00007029
  • Report No.: SAND99-1060J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 7029
  • Archival Resource Key: ark:/67531/metadc712426

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  • April 27, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • Dec. 7, 2016, 4:50 p.m.

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Blount, M.A.; Lyo, S.K.; Moon, J.S.; Reno, J.L.; Simmons, J.A. & Wendt, J.R. Magnetoresistance of One-Dimensional Subbands in Tunnel-Coupled Double Quantum Wires, article, April 27, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc712426/: accessed December 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.