Density modulations associated with the dynamical instability in the bose-hubbard model

Rui Asaoka, Hiroki Tsuchiura, Makoto Yamashita, Yuta Toga

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

We analyze the non-equilibrium quantum dynamics of a Bose-Einstein condensate that flows in an optical lattice on the basis of the Bose-Hubbard model. The time evolution of a condensate calculated by the dynamical Gutzwiller approximation has clarified that density modulations appear as a precursor phenomenon of the dynamical instability. Furthermore, the principal mode of modulations strongly depends on both the interparticle interaction strength and the rate of momentum acceleration. We show that these features of density modulations are well explained by the stability phase diagram obtained on the basis of the Bogoliubov theory.

Original languageEnglish
Article number124001
Journaljournal of the physical society of japan
Volume83
Issue number12
DOIs
Publication statusPublished - 2014 Dec 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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