Competition of spin and charge excitations in the one-dimensional Hubbard model

Bruno Sciolla, Akiyuki Tokuno, Shun Uchino, Peter Barmettler, Thierry Giamarchi, Corinna Kollath

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Abstract

Motivated by recent experiments with ultracold fermionic atoms in optical lattices, we study finite temperature magnetic correlations, as singlet and triplet correlations, and the double occupancy in the one-dimensional Hubbard model. We point out that for intermediate interaction strengths the double occupancy has an intriguing doubly nonmonotonic temperature dependence due to the competition between spin and charge modes, related to the Pomeranchuk effect. Furthermore, we determine properties of magnetic correlations in the temperature regimes relevant for current cold atom experiments and discuss effects of the trap on spatially integrated observables. We estimate the entropy and the temperature reached in the experiment by Greif, Uehlinger, Jotzu, Tarruell, and Esslinger.

Original languageEnglish
Article number063629
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume88
Issue number6
DOIs
Publication statusPublished - 2013 Dec 16
Externally publishedYes

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excitation
temperature
atoms
traps
entropy
temperature dependence
estimates
interactions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Competition of spin and charge excitations in the one-dimensional Hubbard model. / Sciolla, Bruno; Tokuno, Akiyuki; Uchino, Shun; Barmettler, Peter; Giamarchi, Thierry; Kollath, Corinna.

In: Physical Review A - Atomic, Molecular, and Optical Physics, Vol. 88, No. 6, 063629, 16.12.2013.

Research output: Contribution to journalArticle

Sciolla, Bruno ; Tokuno, Akiyuki ; Uchino, Shun ; Barmettler, Peter ; Giamarchi, Thierry ; Kollath, Corinna. / Competition of spin and charge excitations in the one-dimensional Hubbard model. In: Physical Review A - Atomic, Molecular, and Optical Physics. 2013 ; Vol. 88, No. 6.
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