Novel magnetic-field-induced minigap and transport in coupled double quantum wells

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A review is given of recent theoretical and experimental work on in-plane electron transport in strongly coupled double quantum wells (QWs) in the presence of an in-plane magnetic field B{sub {parallel}} {parallel} x. This system displays unusual electronic and transport properties arising from a partial minigap ({approximately} a few meV) formed in the transverse in-plane direction k{sub y} {perpendicular} B{sub {parallel}} in k-space due to the anticrossing of the two QW dispersion curves displaced relative to each other by {Delta}k{sub y} {proportional_to} B{sub {parallel}}. Sweeping B{sub {parallel}} moves the minigap through the Fermi level ({mu}), deforming the Fermi surface from ... continued below

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12 p.

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Lyo, S.K.; Simmons, J.A.; Harff, N.E. & Klem, J.F. August 1, 1995.

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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

A review is given of recent theoretical and experimental work on in-plane electron transport in strongly coupled double quantum wells (QWs) in the presence of an in-plane magnetic field B{sub {parallel}} {parallel} x. This system displays unusual electronic and transport properties arising from a partial minigap ({approximately} a few meV) formed in the transverse in-plane direction k{sub y} {perpendicular} B{sub {parallel}} in k-space due to the anticrossing of the two QW dispersion curves displaced relative to each other by {Delta}k{sub y} {proportional_to} B{sub {parallel}}. Sweeping B{sub {parallel}} moves the minigap through the Fermi level ({mu}), deforming the Fermi surface from a two-component surface (with one orbit inside the other) to a single-orbit surface, and then back to a two-separated-orbit structure, accordingly as {mu} lies above, inside, and below the gap, respectively. The authors show that the density of states develops a sharp van Hove singularity at the lower gap edge, while transport properties such as the in-plane conductance and the cyclotron mass show sharp B{sub {parallel}}-dependent structures as {mu} passes through the gap edges.

Physical Description

12 p.

Notes

OSTI as DE95016414

Source

  • Chanceller`s symposium, Riverside, CA (United States), 18 Mar 1995

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  • Other: DE95016414
  • Report No.: SAND--95-0589C
  • Report No.: CONF-9503175--1
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 102203
  • Archival Resource Key: ark:/67531/metadc625581

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  • August 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • April 14, 2016, 7:57 p.m.

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Lyo, S.K.; Simmons, J.A.; Harff, N.E. & Klem, J.F. Novel magnetic-field-induced minigap and transport in coupled double quantum wells, article, August 1, 1995; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc625581/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.