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arXiv 1202.3574cond-mat.quant-gas
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吸引玻色-哈伯德模型中的相对运动和质心运动

Relative and center-of-mass motion in the attractive Bose-Hubbard model

Ole Søe Sørensen, Søren Gammelmark, Klaus Mølmer

摘要:

利用第一性原理数值计算了具有周期边界条件的吸引玻色-哈伯德模型的少粒子解。我们证明了用数值对角化方法得到的低能多体态可以写成粒子的紧凑复合系统的平移叠加态。这些紧凑的状态打破了问题的平移对称性,它们的质心和内部激发提供了完整模型的能谱的简单解释。

英文摘要:

We present first-principle numerical calculations for few particle solutions of the attractive Bose-Hubbard model with periodic boundary conditions. We show that the low-energy many-body states found by numerical diagonalization can be written as translational superposition states of compact composite systems of particles. These compact states break the translational symmetry of the problem and their center-of-mass and internal excitations offer simple explanations of the energy spectrum of the full model.

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