Doping a 2d Mott insulator – Study of a quantum dimer model

ORAL

Abstract

Experiments with quantum gas microscopes have started to explore the antiferromagnetic phase of the Fermi-Hubbard model and effects of doping with holes away from half filling1. We show in this talk that the system averaged local two-spin density matrix enables to distinguish magnetically ordered and interesting topologically ordered spin-liquid phases, which might occur in the Hubbard model close to half filling.
Fractionalized Fermi liquids (FL*) are a promising candidate for this parameter regime. The generalized quantum dimer model introduced in Ref. [2] is an effective lattice realization of such an FL* with a Hilbert space spanned by configurations of fermionic and bosonic short-range bound states. We construct a rather unconventional dynamical cluster approximation (DCA) by making explicit use of the dimer Hilbert space and show first results of spectral data for a minimal cluster of two lattice sites.

1A. Mazurenko, C. Chiu et al., Nature 545, 7655 (2017)
2M. Punk, A. Allais and S. Sachdev, PNAS 112, 31 (2015)

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Presenters

  • Sebastian Huber

    Arnold Sommerfeld Center, Ludwig-Maximilians University, 80333 Munich, Germany

Authors

  • Sebastian Huber

    Arnold Sommerfeld Center, Ludwig-Maximilians University, 80333 Munich, Germany

  • Fabian Grusdt

    Physics Department, Technical University of Munich, Department of Physics and Institute for Advanced Study, Technical University of Munich, 85748 Garching, Harvard University, Technical University of Munich

  • Matthias Punk

    Ludwig Maximilian University of Munich, Arnold Sommerfeld Center, Ludwig-Maximilians University, 80333 Munich, Germany