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)

*S. Huber and M. Punk were supported by the German Excellence Initiative via the Nanosystems Initiative Munich (NIM). F. Grusdt acknowledges financial support by the Gordon and Betty Moore foundation under the EPiQS program.

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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