TY - JOUR
T1 - Density modulations associated with the dynamical instability in the bose-hubbard model
AU - Asaoka, Rui
AU - Tsuchiura, Hiroki
AU - Yamashita, Makoto
AU - Toga, Yuta
N1 - Publisher Copyright:
© 2014 The Physical Society of Japan.
PY - 2014/12/15
Y1 - 2014/12/15
N2 - 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.
AB - 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.
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U2 - 10.7566/JPSJ.83.124001
DO - 10.7566/JPSJ.83.124001
M3 - Article
AN - SCOPUS:84924942308
SN - 0031-9015
VL - 83
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 12
M1 - 124001
ER -