Antiferromagnetism and the gap of a Mott insulator : Results from analytic continuation of the self-energy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Xin Wang
  • Emanuel Gull
  • Luca De Medici
  • Massimo Capone
  • Andrew J. Millis

Detail(s)

Original languageEnglish
Article number45101
Journal / PublicationPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number4
Publication statusPublished - 6 Aug 2009
Externally publishedYes

Abstract

Direct analytic continuation of the self-energy is used to determine the effect of antiferromagnetic ordering on the spectral function and optical conductivity of a Mott insulator. Comparison of several methods shows that the most robust estimation of the gap value is obtained by use of the real part of the continued self-energy in the quasiparticle equation within the single-site dynamical mean-field theory of the two-dimensional square lattice Hubbard model, where, for a U that is slightly greater than the Mott critical value, antiferromagnetism increases the gap by about 80%. © 2009 The American Physical Society.

Citation Format(s)

Antiferromagnetism and the gap of a Mott insulator : Results from analytic continuation of the self-energy. / Wang, Xin; Gull, Emanuel; De Medici, Luca; Capone, Massimo; Millis, Andrew J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 4, 45101, 06.08.2009.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review