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Title: Chern band insulators in a magnetic field
Authors: Araújo, Miguel
Castro, Eduardo
Keywords: número de Chern
efeito de Hall quântico
espectro de Hofstadter
estados de superfície
Issue Date: 29-Jan-2014
Publisher: Journal of Physics: Condensed Matter
Citation: Journal of Physics: Condensed Matter 26, 075501 (2014)
Abstract: The effect of a magnetic field on a two-dimensional Chern band insulator is discussed. It is shown that, unlike the trivial insulator, an anomalous Hall insulator with Chern number C becomes a metal when a magnetic field is applied at constant particle density, for any C >0. For a timereversal invariant topological insulator with a spin Chern resolved number, C_up=-C_down=C, the magnetic field induces a spin polarized spin Hall insulator. We consider also the effect of a superlattice potential and extend previous results for the quantization of the Hall conductance of filled Hofstadter bands to this problem.
Type: article
Appears in Collections:FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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