Phys. Rev. Lett. 97, 186404 (2006) [4 pages]Valley Susceptibility of an Interacting Two-Dimensional Electron SystemReceived 29 April 2006; published 3 November 2006 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. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.97.186404
DOI:
10.1103/PhysRevLett.97.186404
PACS:
71.70.Fk, 73.21.−b, 73.43.Qt
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