Berlin 2018 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 19: Frustrated Magnets - Spin Liquids - Theory
TT 19.8: Vortrag
Montag, 12. März 2018, 17:00–17:15, H 3010
Doping a 2d Mott insulator - Study of a quantum dimer model — •Sebastian Huber1, Johannes Feldmeier1, Fabian Grusdt2, and Matthias Punk1 — 1Arnold Sommerfeld Center, Ludwig-Maximilians University, 80333 Munich, Germany — 2Department of Physics, Harvard University, Cambridge, MA 02138, USA
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 filling [1]. We show in this talk that the read-out of the two-particle reduced 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*) [2] are a promising candidate for this parameter regime. The generalized quantum dimer model introduced in Ref. [3] 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 compute the corresponding electron spectral functions using exact diagonalization on lattices of size 6x6 to verify the existence of a pseudogap.
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M. Punk, A. Allais and S. Sachdev, PNAS 112, 31 (2015)