Phys. Rev. Lett. 101, 146405 (2008) [4 pages]Dependence of Effective Mass on Spin and Valley Degrees of FreedomReceived 16 July 2008; published 2 October 2008 We measure the effective mass (m*) of interacting two-dimensional electrons confined to an AlAs quantum well while we change the conduction-band valley occupation and the spin polarization via the application of strain and magnetic field, respectively. Compared to its band value, m* is enhanced unless the electrons are fully valley- and spin-polarized. Incidentally, in the fully spin- and valley-polarized regime, the electron system exhibits an insulating behavior. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.146405
DOI:
10.1103/PhysRevLett.101.146405
PACS:
71.18.+y, 72.25.Dc, 73.43.Qt
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