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Effective masses in high-mobility 2D electron gas structures

Research output: Contribution to journalJournal article

Published

  • Peter T Coleridge
  • M Hayne
  • P Zawadzki
  • Andrew S Sachrajda
Journal publication date20/07/1996
JournalSurface Science
Journal number1-3
Volume362
Number of pages4
Pages560-563
Original languageEnglish

Abstract

Effective masses derived from the low-field Shubnikov-de Haas oscillations in high mobility GaAs/AlGaAs samples are found to decrease systematically with density. Measurements in a low-density sample show the temperature dependence does not conform to standard theory. It is argued that this is to be expected when there is extra structure, in addition to the Landau levels, in the density of states. This may be important in interpreting measurements of composite fermion effective masses.