Harmonically trapped attractive and repulsive spin–orbit and Rabi coupled Bose–Einstein condensates
Harmonically trapped attractive and repulsive spin–orbit and Rabi coupled Bose–Einstein condensates
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DOI：
10.1088/1751-8121/aa59c1
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发表时间：
2017-02
期刊：
影响因子：
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通讯作者：
Emerson Chiquillo
中科院分区：
文献类型：
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作者：
Emerson Chiquillo
数值研究了一维有效自旋轨道（SO）和Rabi耦合的两个赝旋量玻色-爱因斯坦凝聚（BEC）在简谐势阱作用下的基态。对于这两种符号的相互作用，SO和拉比耦合的BEC在谐波势的密度分布，这模拟了真实的实验情况。谐波陷阱导致冷凝物的多峰性质的强烈减少，并且增加其密度。对于排斥相互作用，SO耦合的增加导致未压缩的密度较低的冷凝物，并增加了密度的多峰性质。拉比耦合的增加导致密度增加，具有几乎恒定数量的多峰。在相互作用的符号和拉比耦合的负值下，凝聚体在中心点形成一个凹口，看起来像是一个明中暗孤子。在吸引非线性的情况下，一个有趣的结果是在SO和Rabi耦合的作用下的崩溃阈值的增加。
Numerically we investigate the ground state of effective one-dimensional spin–orbit (SO) and Rabi coupled two pseudo-spinor Bose–Einstein condensates (BECs) under the effect of harmonic traps. For both signs of the interaction, density profiles of SO and Rabi coupled BECs in harmonic potentials, which simulate a real experimental situation are obtained. The harmonic trap causes a strong reduction of the multi-peak nature of the condensate and it increases its density. For repulsive interactions, the increase of SO coupling results in an uncompressed less dense condensate and with increased multi-peak nature of the density. The increase of Rabi coupling leads to a density increase with an almost constant number of multi-peaks. For both signs of the interaction and negative values of Rabi coupling, the condensate develops a notch in the central point and it seems to a dark-in-bright soliton. In the case of the attractive nonlinearity, an interesting result is the increase of the collapse threshold under the action of the SO and Rabi couplings.