Quantum electron transport in magnetically entangled subbands

William Mayer, Sergey Vitkalov, A. A. Bykov

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Transport properties of highly mobile two-dimensional (2D) electrons in symmetric GaAs quantum wells with two populated subbands placed in tilted magnetic fields are studied at high temperatures. Quantum positive magnetoresistance (QPMR) and magneto-intersubband resistance oscillations (MISO) are observed in quantizing magnetic fields, B¥, applied perpendicular to the 2D layer. QPMR displays contributions from electrons with considerably different quantum lifetimes, τq(1,2), confirming the presence of two subbands in the studied system. MISO evolution with B¥ agrees with the obtained quantum scattering times only if an additional reduction of the MISO magnitude is applied at small magnetic fields. This indicates the presence of a yet unknown mechanism leading to MISO damping. Application of an in-plane magnetic field produces a strong decrease of both QPMR and MISO magnitude. The reduction of QPMR is explained by spin splitting of Landau levels indicating a g factor, g≈0.4, which is considerably less than the g factor found in GaAs quantum well with a single subband populated. In contrast to QPMR, the decrease of MISO magnitude is largely related to the in-plane magnetic field induced entanglement between quantum levels in different subbands that, in addition, increases the MISO period.

Original languageEnglish
Article number045436
Number of pages11
JournalPhysical Review B
Volume96
Issue number4
DOIs
Publication statusPublished - 28 Jul 2017

Keywords

  • 2-DIMENSIONAL SYSTEMS
  • FERMI-SURFACE
  • BREAKDOWN
  • FIELD
  • HETEROSTRUCTURES
  • SCATTERING
  • WELL
  • GAS

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