Magnetic breakdown in double quantum wells

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The authors find that a sufficiently large perpendicular magnetic field (B{sub {perpendicular}}) causes magnetic breakdown (MB) in coupled double quantum wells (QWs) that are subject to an in-plane magnetic field (B{sub {parallel}}). B{sub {parallel}} shifts one QW dispersion curve with respect to that of the other QW, resulting in an anticrossing and an energy gap. When the gap is below the Fermi level the resulting Fermi surface (FS) consists of two components, a lens-shaped inner orbit and an hour-glass shaped outer orbit. B{sub {perpendicular}} causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each component of the FS. MB ... continued below

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5 p.

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Harff, N.E.; Simmons, J.A.; Klem, J.F.; Boebinger, G.S.; Pfeiffer, L.N. & West, K.W. August 1, 1996.

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

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Description

The authors find that a sufficiently large perpendicular magnetic field (B{sub {perpendicular}}) causes magnetic breakdown (MB) in coupled double quantum wells (QWs) that are subject to an in-plane magnetic field (B{sub {parallel}}). B{sub {parallel}} shifts one QW dispersion curve with respect to that of the other QW, resulting in an anticrossing and an energy gap. When the gap is below the Fermi level the resulting Fermi surface (FS) consists of two components, a lens-shaped inner orbit and an hour-glass shaped outer orbit. B{sub {perpendicular}} causes Landau level formation and Shubnikov-de Haas (SdH) oscillations for each component of the FS. MB occurs when the magnetic forces from B{sub {perpendicular}} become dominant and the electrons move on free-electron circular orbits rather than on the lens and hour-glass orbits. MB is observed by identifying the peaks present in the Fourier power spectrum of the longitudinal resistance vs. 1/B{sub {perpendicular}} at constant B{sub {parallel}}, an arrangement achieved with an in-situ tilting sample holder. Results are presented for two strongly coupled GaAs/AlGaAs DQW samples.

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5 p.

Notes

OSTI as DE96013402

Source

  • International conference on physics of semiconductors, Berlin (Germany), 21-26 Jul 1996

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  • Other: DE96013402
  • Report No.: SAND--96-0619C
  • Report No.: CONF-960781--1
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/270798 | External Link
  • Office of Scientific & Technical Information Report Number: 270798
  • Archival Resource Key: ark:/67531/metadc664218

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Creation Date

  • August 1, 1996

Added to The UNT Digital Library

  • June 29, 2015, 9:42 p.m.

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  • April 14, 2016, 4:17 p.m.

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Harff, N.E.; Simmons, J.A.; Klem, J.F.; Boebinger, G.S.; Pfeiffer, L.N. & West, K.W. Magnetic breakdown in double quantum wells, report, August 1, 1996; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc664218/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.