Short-range correlations and cooling of ultracold fermions in the honeycomb lattice

Baoming Tang, Thereza Paiva, Ehsan Khatami, Marcos Rigol

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We use determinantal quantum MonteCarlo 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.

Original languageEnglish (US)
Article number205301
JournalPhysical review letters
Volume109
Issue number20
DOIs
StatePublished - Nov 12 2012

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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