Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom

Details Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom Dependence of spin susceptibility of a two-dimensional electron system on the valley degree of freedom

2004-02-15

arxiv.org/abs/cond-mat/0402399v1

Phys. Rev. Lett. 92, 246804 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.92.246804

We report measurements of the spin susceptibility, $\chi\propto g_v g^*m^*$, in an AlAs two-dimensional electron system where, via the application of in-plane stress, we transfer electrons from one conduction-band valley to another ($g_v$ is the valley degeneracy, and $m^*$ and $g^*$ are the electron effective mass and g-factor). At a given density, when the two valleys are equally populated ($g_v=2$), the measured $g^*m^*$ is smaller than when only one valley is occupied ($g_v=1$). This observation counters the common assumption that a two-valley two-dimensional system is effectively more dilute than a single-valley system because of its smaller Fermi energy.

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