Contrast between spin and valley degrees of freedom

Details Contrast between spin and valley degrees of freedom Contrast between spin and valley degrees of freedom

2010-08-15

arxiv.org/abs/1008.2536v1

Phys. Rev. B 81, 235305 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4+ pages, 2 figures

Scientific paper

10.1103/PhysRevB.81.235305

We measure the renormalized effective mass (m*) of interacting two-dimensional electrons confined to an AlAs quantum well while we control their distribution between two spin and two valley subbands. We observe a marked contrast between the spin and valley degrees of freedom: When electrons occupy two spin subbands, m* strongly depends on the valley occupation, but not vice versa. Combining our m* data with the measured spin and valley susceptibilities, we find that the renormalized effective Lande g-factor strongly depends on valley occupation, but the renormalized conduction-band deformation potential is nearly independent of the spin occupation.

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