Aharonov-Casher Effect in Wigner Crystal Exchange Interactions

Details Aharonov-Casher Effect in Wigner Crystal Exchange Interactions Aharonov-Casher Effect in Wigner Crystal Exchange Interactions

2008-09-03

arxiv.org/abs/0809.0598v2

Phys. Rev. Lett. 102 (2009) 126801

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 1 figure

Scientific paper

We theoretically study the effects of spin-orbit coupling on spin exchange in a low-density Wigner crystal. In addition to the familiar antiferromagnetic Heisenberg exchange, we find general anisotropic interactions in spin space if the exchange paths allowed by the crystal structure form loops in real space. In particular, it is shown that the two-electron exchange interaction can acquire ferromagnetic character.

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