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Phys Rev Lett. 2006 Nov 3;97(18):186404. Epub 2006 Nov 3.

Valley susceptibility of an interacting two-dimensional electron system.

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1
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.

Abstract

We report direct measurements of the valley susceptibility, the change of valley population in response to an applied symmetry-breaking strain, in an AlAs two-dimensional electron system. As the two-dimensional density is reduced, the valley susceptibility dramatically increases relative to its band value, reflecting the system's strong electron-electron interaction. The increase has a remarkable resemblance to the enhancement of the spin susceptibility and establishes the analogy between the spin and valley degrees of freedom.

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