Stable Bloch Oscillations of Cold Atoms with Time-Dependent Interaction

被引：38

作者：

Gaul, C. ^{[1
]}

Lima, R. P. A. ^{[2
]}

Diaz, E. ^{[2
]}

Mueller, C. A. ^{[1
,3
]}

Dominguez-Adame, F. ^{[2
]}

机构：

[1] Univ Bayreuth, Inst Phys, D-95440 Bayreuth, Germany

[2] Univ Complutense, GISC, Dept Fis Mat, E-28040 Madrid, Spain

[3] UPMC, Lab Kastler Brossel, ENS, CNRS, F-75005 Paris, France

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 25期

关键词：

SEMICONDUCTOR SUPERLATTICE; DYNAMICS;

D O I：

10.1103/PhysRevLett.102.255303

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate Bloch oscillations of interacting cold atoms in a mean-field framework. In general, atom-atom interaction causes dephasing and destroys Bloch oscillations. Here we show that Bloch oscillations are persistent if the interaction is modulated harmonically with suitable frequency and phase. For other modulations, Bloch oscillations are rapidly damped. We explain this behavior in terms of collective coordinates whose Hamiltonian dynamics permits one to predict a whole family of stable solutions. In order to describe also the unstable cases, we carry out a stability analysis for Bogoliubov excitations. Using Floquet theory, we are able to predict the unstable modes as well as their growth rate, found to be in excellent agreement with numerical simulations.

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页数：4

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