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

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

2009-04-13

arxiv.org/abs/0904.1982v3

Phys. Rev. B 80, 045101 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 9 figures. An error in normalization of optical conductivity (Fig. 9) corrected. to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.80.045101

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 U slightly greater than the Mott critical value, antiferromagnetism increases the gap by about 80%.

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