Can Correlations Drive a Band Insulator Metallic?

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2006-07-26

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American Physical Society

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We analyze the effects of the on-site Coulomb repulsion U on a band insulator using dynamical mean field theory (DMFT). We find the surprising result that the gap is suppressed to zero at a critical U_c1 and remains zero within a metallic phase. At a larger U_c2 there is a second transition from the metal to a Mott insulator, in which the gap increases with increasing U. These results are qualitatively different from Hartree-Fock theory which gives a monotonically decreasing but nonzero insulating gap for all finite U.

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Arti Garg, H. R. Krishnamurthy, Mohit Randeria, "Can Correlations Drive a Band Insulator Metallic?," Physical Review Letters 97, no. 4 (2006), doi:10.1103/PhysRevLett.97.046403

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http://hdl.handle.net/1811/48067

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Ohio State University Research and Scholarship