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

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

2008-07-08

arxiv.org/abs/0807.1327v1

Phys. Rev. Lett. 101, 026402 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.026402

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.

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