Atomic Fermi Gas in the Trimerized Kagomé Lattice at 2/3 Filling

B. Damski, H.-U. Everts, A. Honecker, H. Fehrmann, L. Santos, and M. Lewenstein
Phys. Rev. Lett. 95, 060403 – Published 5 August 2005

Abstract

We study low temperature properties of a spinless interacting Fermi gas in the trimerized kagomé lattice. The case of two fermions per trimer is described by a quantum spin 1/2 model on the triangular lattice with couplings depending on the bond directions. Using exact diagonalizations we show that the system exhibits nonstandard properties of a quantum spin-liquid crystal, combining a planar antiferromagnetic order with an exceptionally large number of low-energy excitations.

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  • Received 6 December 2004

DOI:https://doi.org/10.1103/PhysRevLett.95.060403

©2005 American Physical Society

Authors & Affiliations

B. Damski1,2, H.-U. Everts1, A. Honecker3, H. Fehrmann1, L. Santos4, and M. Lewenstein1,5,*

  • 1Institut für Theoretische Physik, Universität Hannover, Appelstrasse 2, D-30167 Hannover, Germany
  • 2Instytut Fizyki, Uniwersytet Jagielloński, Reymonta 4, PL-30-059 Kraków, Poland
  • 3Institut für Theoretische Physik, TU Braunschweig, Mendelssohnstrasse 3, D-38106 Braunschweig, Germany
  • 4Institut für Theoretische Physik III, Universität Stuttgart, Pfaffenwaldring 57 V, D-70550 Stuttgart, Germany
  • 5ICFO-Institut de Ciències Fotòniques, Jordi Girona 29, Edifici Nexus II, E-08034 Barcelona, Spain

  • *Also at Institució Catalana de Recerca i Estudis Avançats.

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Issue

Vol. 95, Iss. 6 — 5 August 2005

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