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High-field spin-polarization transition in the Landau bands of quasi-2D electron gases with strong lateral modulation

Research output: Contribution to journalJournal article

Published

  • Florent Petit
  • Larbi Sfaxi
  • Francois Lelarge
  • A Cavanna
  • M Hayne
  • Bernard Etienne
Journal publication date20/04/1997
JournalEurophysics Letters
Journal number3
Volume38
Number of pages6
Pages225-230
Original languageEnglish

Abstract

2D electron gases, imbedded in a 1D lateral potential (in AlxGa1-xAs), made by a periodic modulation in alloy composition, are obtained by organized epitaxy on vicinal surfaces. The exchange enhancement of the Landau level spin splitting is inhibited up to a strong magnetic field (similar to 6T here). Low-temperature magneto-transport data revealing this effect cannot be explained by disorder but are fully consistent with the large potential gradients associated with the modulation amplitude.