Spin coupling in zigzag Wigner crystals

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fac_MeyerJ_PhysicalReviewB_2007_76_7.pdf (645.81 KB)

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2007-08-02

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American Physical Society

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We consider interacting electrons in a quantum wire in the case of a shallow confining potential and low electron density. In a certain range of densities, the electrons form a two-row (zigzag) Wigner crystal whose spin properties are determined by nearest and next-nearest neighbor exchange as well as by three- and four-particle ring exchange processes. The phase diagram of the resulting zigzag spin chain has regions of complete spin polarization and partial spin polarization in addition to a number of unpolarized phases, including antiferromagnetism and dimer order as well as a novel phase generated by the four-particle ring exchange.

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A. D. Klironomos et al, "Spin coupling in zigzag Wigner crystals," Physical Review B 76, no. 7 (2007), doi:10.1103/PhysRevB.76.075302

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http://hdl.handle.net/1811/48824

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Ohio State University Research and Scholarship