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Self-bound supersolid stripe phase in binary Bose-Einstein condensates
Physical Review A ( IF 2.9 ) Pub Date : 
R. Sachdeva, M. Nilsson Tengstrand, S. M. Reimann

Supersolidity – a coexistence of superfluidity and crystalline or amorphous density variations – has been vividly debated ever since its conjecture. While the initial focus was on helium-4, recent experiments uncovered supersolidity in ultra-cold dipolar quantum gases. Here, we propose a new self-bound supersolid phase in a binary mixture of Bose gases with short-range interactions, making use of the non-trivial properties of spin-orbit coupling. We find that a first-order phase transition from a self-bound supersolid stripe phase to a zero-minimum droplet state of the Bose gas occurs as a function of the Rabi coupling strength. These phases are characterized using the momentum distribution, the transverse spin polarization and the superfluid fraction. The critical point of the transition is estimated in an analytical framework. The predicted density-modulated supersolid stripe and zero-minimum droplet phase should be experimentally observable in a binary mixture of 39K with spin-orbit coupling.

中文翻译:

二元玻色-爱因斯坦凝聚物中的自结合超固体条纹相

自从超猜想以来,超流体(超流体和晶体或非晶态密度变化的共存)就一直受到激烈争论。当最初的重点是氦4时,最近的实验发现了超冷偶极子量子气体中的超固体。在这里,我们利用自旋轨道耦合的非平凡特性,提出了一种具有短程相互作用的玻色气体二元混合物中的新的自结合超固相。我们发现,玻色气体从自束缚超固相带相到零最小液滴状态的一阶相变是Rabi耦合强度的函数。这些相的特征在于动量分布,横向自旋极化和超流体分数。过渡的关键点是在分析框架中估算的。39K具有自旋轨道耦合。
更新日期:2020-09-16
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