Effective Spin Model for the Spin-Liquid Phase of the Hubbard Model on the Triangular Lattice

Yang HY, Laeuchli AM, Mila F, Schmidt KP (2010)

Publication Status: Published

Publication Type: Journal article

Publication year: 2010

Journal

Physical Review Letters American Physical Society

Publisher: AMER PHYSICAL SOC

Book Volume: 105

Journal Issue: 26

DOI: 10.1103/PhysRevLett.105.267204

Abstract

We show that the spin-liquid phase of the half-filled Hubbard model on the triangular lattice can be described by a pure spin model. This is based on a high-order strong coupling expansion ( up to order 12) using perturbative continuous unitary transformations. The resulting spin model is consistent with a transition from three-sublattice long-range magnetic order to an insulating spin-liquid phase, and with a jump of the double occupancy at the transition. Exact diagonalizations of both models show that the effective spin model is quantitatively accurate well into the spin-liquid phase, and a comparison with the Gutzwiller projected Fermi sea suggests a gapless spectrum and a spinon Fermi surface.

Authors with CRIS profile

Kai Phillip Schmidt Professur für Theoretische Physik

Involved external institutions

Technische Universität Dortmund DE Germany (DE) Max-Planck-Institut für Physik komplexer Systeme (MPI PKS) / Max Planck Institute for the Physics of Complex Systems DE Germany (DE) École Polytechnique Fédérale de Lausanne (EPFL) CH Switzerland (CH)

How to cite

APA:

Yang, H.-Y., Laeuchli, A.M., Mila, F., & Schmidt, K.P. (2010). Effective Spin Model for the Spin-Liquid Phase of the Hubbard Model on the Triangular Lattice. Physical Review Letters, 105(26). https://doi.org/10.1103/PhysRevLett.105.267204

MLA:

Yang, Hong-Yu, et al. "Effective Spin Model for the Spin-Liquid Phase of the Hubbard Model on the Triangular Lattice." Physical Review Letters 105.26 (2010).

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