Valley susceptibility of an interacting two-dimensional electron system

Details Valley susceptibility of an interacting two-dimensional electron system Valley susceptibility of an interacting two-dimensional electron system

2006-05-29

arxiv.org/abs/cond-mat/0605692v1

Phys. Rev. Lett. 97, 186 404 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.97.186404

We report direct measurements of the valley susceptibility, the change of valley population in response to 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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