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arXiv 1405.5035cond-mat.quant-gas
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玻色-爱因斯坦凝聚体中拓扑缺陷-硬壁-附近Bogoliubov模色散关系的精确解

Exact solutions for the dispersion relation of Bogoliubov modes localized near a topological defect - a hard wall - in Bose-Einstein condensate

Peter V. Pikhitsa

摘要:

我们考虑一个具有排斥作用的玻色子的玻色-爱因斯坦凝聚体,它由Gross-Pitaevskii方程描述,并被一个不可穿透的“硬壁”(刚性或柔性)所限制,该硬壁旨在抑制暗孤子固有的“蛇不稳定性”。我们解析地求解Bogoliubov-de Gennes方程,以找到位于“畴壁”附近的无隙Bogoliubov激发谱,从而从玻色-爱因斯坦凝聚体的体激发谱中分离出来。“畴壁”可以模拟液氦的表面,也可以模拟被强烈俘获的玻色-爱因斯坦凝聚体的表面。对于所有波数$k$,沿表面的“自由粒子”行为$k \rightarrow \infty$,发现表面激发的色散关系,后者被证明是绑定到“硬壁”与一些“通用”能量$Δ$。

英文摘要:

We consider a Bose-Einstein condensate of bosons with repulsion, described by the Gross-Pitaevskii equation and restricted by an impenetrable "hard wall" (either rigid or flexible) which is intended to suppress the "snake instability" inherent for dark solitons. We solve analytically the Bogoliubov - de Gennes equations to find the spectra of gapless Bogoliubov excitations localized near the "domain wall" and therefore split from the bulk excitation spectrum of the Bose-Einstein condensate. The "domain wall" may model either the surface of liquid helium or of a strongly trapped Bose-Einstein condensate. The dispersion relations for the surface excitations are found for all wavenumbers $k$ along the surface up to the "free-particle" behavior $k \rightarrow \infty$, the latter was shown to be bound to the "hard wall" with some "universal" energy $Δ$.

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