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


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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