Ground-State Degeneracy of Correlated Insulators with Edges

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Using the topological flux insertion procedure, the ground-state degeneracy of an insulator on a periodic lattice with filling factor $ν=p/q$ was found to be at least $q$-fold. Applying the same argument in a lattice with edges, we show that the degeneracy is modified by the additional edge density $ν_{\mysw{E}}$ associated with the open boundaries. In particular, we demonstrate that these edge corrections may even make an insulator with integer bulk filling degenerate.
4 pages, REVTeX 4

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/24952

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0409729
 http://arxiv.org/abs/cond-mat/0409729
 Phys. Rev. B 72, 073109 (2005)
 doi:10.1103/PhysRevB.72.073109

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arXiv