Multibranch Bogoliubov-Bloch spectrum of a cigar-shaped Bose condensate in an optical lattice
Multibranch Bogoliubov-Bloch spectrum of a cigar-shaped Bose condensate in an optical lattice
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DOI：
10.1103/physreva.72.053623
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发表时间：
2005-10
影响因子：
2.9
通讯作者：
T. Ghosh;K. Machida
中科院分区：
文献类型：
--
作者：
T. Ghosh;K. Machida
利用流体力学理论研究了弱耦合准二维玻色凝聚体阵列激发态的性质。轴向激发态的光谱强烈地依赖于在给定的对称性的各种离散的径向模式之间的耦合。通过在给定对称性下引入模耦合，给出了具有各种离散径向节点的轴向准粒子的完整激发谱。确定了确定模式耦合强度的单个参数。利用布拉格散射实验可以观察到零角动量区的激发谱。
We study properties of excited states of an array of weakly coupled quasi-two-dimensional Bose condensates by using the hydrodynamic theory. The spectrum of the axial excited states strongly depends on the coupling among the various discrete radial modes in a given symmetry. By including mode coupling within a given symmetry, the complete excitation spectrum of axial quasiparticles with various discrete radial nodes are presented. A single parameter which determines the strength of the mode coupling is identified. The excitation spectrum in the zero angular momentum sector can be observed by using the Bragg scattering experiments.