Dynamical instability in the S=1 Bose-Hubbard model

被引：7

作者：

Asaoka, Rui ^{[1
]}

Tsuchiura, Hiroki ^{[1
]}

Yamashita, Makoto ^{[2
]}

Toga, Yuta ^{[1
]}

机构：

[1] Tohoku Univ, Dept Appl Phys, Sendai, Miyagi 9808579, Japan

[2] NTT Corp, NTT Basic Res Labs, Atsugi, Kanagawa 2430198, Japan

来源：

PHYSICAL REVIEW A | 2016年 / 93卷 / 01期

基金：

日本学术振兴会;

关键词：

OPTICAL LATTICE; EINSTEIN CONDENSATE; BOSONS; GASES;

D O I：

10.1103/PhysRevA.93.013628

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We study the dynamical instabilities of superfluid flows in the S = 1 Bose-Hubbard model. The time evolution of each spin component in a condensate is calculated based on the dynamical Gutzwiller approximation for a wide range of interactions, from a weakly correlated regime to a strongly correlated regime near the Mott-insulator transition. Owing to the spin-dependent interactions, the superfluid flow of the spin-1 condensate decays at a different critical momentum from a spinless case when the interaction strength is the same. We furthermore calculate the dynamical phase diagram of this model and clarify that the obtained phase boundary has very different features depending on whether the average number of particles per site is even or odd. Finally, we analyze the density and spin modulations that appear in association with the dynamical instability. We find that spin modulations are highly sensitive to the presence of a uniform magnetic field.

引用

页数：10

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