Document Type

Article

Publication Date

January 2012

Publication Title

Physical Review Letters

Volume

109

Issue Number

20

DOI

10.1103/PhysRevLett.109.205301

Keywords

Short-range, Correlations, Cooling, Ultracold, Fermions

Disciplines

Astrophysics and Astronomy | Physical Sciences and Mathematics | Physics

Abstract

We use determinantal quantum Monte Carlo simulations and numerical linked-cluster expansions to study thermodynamic properties and short-range spin correlations of fermions in the honeycomb lattice. We find that, at half filling and finite temperatures, nearest-neighbor spin correlations can be stronger in this lattice than in the square lattice, even in regimes where the ground state in the former is a semimetal or a spin liquid. The honeycomb lattice also exhibits a more pronounced anomalous region in the double occupancy that leads to stronger adiabatic cooling than in the square lattice. We discuss the implications of these findings for optical lattice experiments.

Comments

This article originally appeared in Physical Review Letters, volume 109, issue 20, 2012, published by the American Physical Society. ©2012 American Physical Society. The article can also be found online at this link.
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