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Valley Susceptibility of an Interacting Two-Dimensional Electron System

2006; American Physical Society; Volume: 97; Issue: 18 Linguagem: Inglês

10.1103/physrevlett.97.186404

1092-0145

Oki Gunawan, Y. P. Shkolnikov, K. Vakili, Tayfun Gokmen, E. P. De Poortere, M. Shayegan,

Physics of Superconductivity and Magnetism

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.