Spin-valley phase diagram of the two-dimensional metal-insulator transition

Details Spin-valley phase diagram of the two-dimensional metal-insulator transition Spin-valley phase diagram of the two-dimensional metal-insulator transition

2006-09-20

arxiv.org/abs/cond-mat/0609493v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

Using symmetry breaking strain to tune the valley occupation of a two-dimensional (2D) electron system in an AlAs quantum well, together with an applied in-plane magnetic field to tune the spin polarization, we independently control the system's valley and spin degrees of freedom and map out a spin-valley phase diagram for the 2D metal-insulator transition. The insulating phase occurs in the quadrant where the system is both spin- and valley-polarized. This observation establishes the equivalent roles of spin and valley degrees of freedom in the 2D metal-insulator transition.

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