Phys. Rev. Lett. 101, 026402 (2008) [4 pages]Effective Mass Suppression in Dilute, Spin-Polarized Two-Dimensional Electron SystemsReceived 19 September 2007; published 7 July 2008 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. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.026402
DOI:
10.1103/PhysRevLett.101.026402
PACS:
71.18.+y, 72.25.Dc, 73.43.Qt
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