Bond Order Solid of Two-Dimensional Dipolar Fermions

S. G. Bhongale, L. Mathey, Shan-Wen Tsai, Charles W. Clark, and Erhai Zhao
Phys. Rev. Lett. 108, 145301 – Published 2 April 2012
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Abstract

The recent experimental realization of dipolar Fermi gases near or below quantum degeneracy provides an opportunity to engineer Hubbard-like models with long-range interactions. Motivated by these experiments, we chart out the theoretical phase diagram of interacting dipolar fermions on the square lattice at zero temperature and half filling. We show that, in addition to p-wave superfluid and charge density wave order, two new and exotic types of bond order emerge generically in dipolar fermion systems. These phases feature homogeneous density but periodic modulations of the kinetic hopping energy between nearest or next-nearest neighbors. Similar, but manifestly different, phases of two-dimensional correlated electrons have previously only been hypothesized and termed “density waves of nonzero angular momentum.” Our results suggest that these phases can be constructed flexibly with dipolar fermions, using currently available experimental techniques.

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  • Received 9 December 2011

DOI:https://doi.org/10.1103/PhysRevLett.108.145301

© 2012 American Physical Society

Authors & Affiliations

S. G. Bhongale1, L. Mathey2,3, Shan-Wen Tsai4, Charles W. Clark3, and Erhai Zhao1

  • 1School of Physics, Astronomy and Computational Sciences, George Mason University, Fairfax, Virginia 22030, USA
  • 2Zentrum für Optische Quantentechnologien and Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany
  • 3Joint Quantum Institute, National Institute of Standards and Technology & University of Maryland, Gaithersburg, Maryland 20899, USA
  • 4Department of Physics and Astronomy, University of California, Riverside, California 92521, USA

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Vol. 108, Iss. 14 — 6 April 2012

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