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arXiv 1402.0231cond-mat.quant-gascond-mat.mes-hallcond-mat.stat-mechcond-mat.str-el
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具有弱接触排斥的一维玻色气体的低能激发

Low-energy excitations of a one-dimensional Bose gas with weak contact repulsion

M. Pustilnik, K. A. Matveev

摘要:

研究了具有弱接触排斥的一维玻色子系统的元激发。我们表明,Gross-Pitaevskii制度,其中的激发是著名的Bogoliubov准粒子和暗孤子,不延伸到低能量极限。相反,这两种激发的光谱在零动量时都有有限的曲率,这与费米子准粒子的唯象图像一致。我们分析描述的交叉之间的Gross-Pitaevskii和低能量制度,并讨论我们的结果的动态结构因子的行为的影响。

英文摘要:

We study elementary excitations of a system of one-dimensional bosons with weak contact repulsion. We show that the Gross-Pitaevskii regime, in which the excitations are the well-known Bogoliubov quasiparticles and dark solitons, does not extend to the low energy limit. Instead, the spectra of both excitations have finite curvatures at zero momentum, in agreement with the phenomenological picture of fermionic quasiparticles. We describe analytically the crossover between the Gross-Pitaevskii and the low-energy regimes, and discuss implications of our results for the behavior of the dynamic structure factor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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