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arXiv 1502.05574cond-mat.quant-gas
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自旋-轨道耦合玻色-爱因斯坦凝聚体中的正负质量孤子

Positive and negative mass solitons in spin-orbit coupled Bose-Einstein condensates

V. Achilleos, D. J. Frantzeskakis, P. G. Kevrekidis, P. Schmelcher, J. Stockhofe

摘要:

本文对准一维自旋轨道耦合玻色-爱因斯坦凝聚体中出现的不同类型的物质波孤子进行了统一的描述。这种描述依赖于通过多尺度展开方法将原始的两组分Gross-Pitaevskii SOC-BEC模型简化为单个非线性薛定谔方程。这样,我们找到近似的亮和暗孤子的解决方案,吸引和排斥原子间的相互作用,分别为不同的制度的SOC相互作用。除此之外,我们的方法还揭示了“负质量”制度,相应的“负质量”亮或暗孤子可以存在排斥或吸引的相互作用,分别。这种独特的机会源于SOC-BEC的激发光谱的结构。数值结果与我们的分析预测非常吻合。

英文摘要:

We present a unified description of different types of matter-wave solitons that can emerge in quasi one-dimensional spin-orbit coupled (SOC) Bose-Einstein condensates (BECs). This description relies on the reduction of the original two-component Gross-Pitaevskii SOC-BEC model to a single nonlinear Schrödinger equation, via a multiscale expansion method. This way, we find approximate bright and dark soliton solutions, for attractive and repulsive interatomic interactions respectively, for different regimes of the SOC interactions. Beyond this, our approach also reveals "negative mass" regimes, where corresponding "negative mass" bright or dark solitons can exist for repulsive or attractive interactions, respectively. Such a unique opportunity stems from the structure of the excitation spectrum of the SOC-BEC. Numerical results are found to be in excellent agreement with our analytical predictions.

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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