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arXiv 1801.05321cond-mat.quant-gas
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谐振陷陷引力和排斥自旋轨道及Rabi耦合玻色-爱因斯坦凝聚体

Harmonically trapped attractive and repulsive spin-orbit and Rabi coupled Bose-Einstein condensates

Emerson Chiquillo

摘要:

通过数值计算,研究了谐波陷阱作用下有效一维自旋轨道(SO)和拉比耦合的两个赝旋量玻色-爱因斯坦凝聚体(BEC)的基态。对于这两个符号的相互作用,SO和拉比耦合的BEC在谐波势,这模拟了一个真实的实验情况下的密度分布。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。对于相互作用的符号和拉比耦合的负值,凝聚体在中心点发展出一个凹口,它似乎是一个明中暗孤子。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。

英文摘要:

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.

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