Effective mass suppression in dilute, spin-polarized two-dimensional electron systems

Medini Padmanabhan, T. Gokmen, N. C. Bishop, M. Shayegan

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We report effective mass (m*) measurements, via analyzing the temperature dependence of the Shubnikov-de Haas oscillations, for dilute, interacting, two-dimensional electron systems (2DESs) occupying a single conduction-band valley in AlAs quantum wells. When the 2DES is partially spin-polarized, m* is larger than its band value, consistent with previous results on various 2DESs. However, as we fully spin-polarize the 2DES by subjecting it to strong parallel magnetic fields, m* is unexpectedly suppressed and falls even below the band mass.

Original languageAmerican English
Article number026402
JournalPhysical review letters
Issue number2
StatePublished - Jul 7 2008

ASJC Scopus subject areas

  • General Physics and Astronomy

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