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Phase Diagrams of Periodically Driven Spin–Orbit Coupled 87Rb and 23Na Bose–Einstein Condensates
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-11-01 , DOI: 10.1002/andp.202000194
Zhi Lin 1, 2
Affiliation  

The phase boundaries of periodically driven spin–orbit coupled BECs with effective two‐body interactions are analytically calculated by using variational method. The phase diagrams of periodically driven 87 Rb and 23 Na systems present distinguished features from undriven systems, respectively. For the 87 Rb BECs, the critical density n c (density at quantum tricritical point) will be dramatically reduced in some parameter regions, and the prospect of observing this intriguing quantum tricritical point is greatly enlarged. Moreover, a series of quantum tricritical points emerge quasi‐periodically when increasing the Raman coupling strength with fixed 87 Rb density. In the 23 Na BECs, two hyperfine states of 23 Na atoms can be miscible within the suitable regions of driving parameter space. As a result, 23 Na systems will stay in the stripe phase with small Raman frequency at typical density, which expands the region of stripe phase in the phase diagram. In addition, an absence of quantum tricritical point in such 23 Na system is observed, which is very unlike 87 Rb  systems.

中文翻译:

周期性驱动的自旋轨道耦合的87Rb和23Na Bose-Einstein凝聚物的相图

使用变分方法分析计算了具有有效两体相互作用的周期性驱动自旋轨道耦合BEC的相界。周期性驱动的相图 87 b 23 系统分别具有与非驱动系统不同的特征。为了 87 b BEC,临界密度 ñ C 量子三临界点处的密度(量子三临界点处的密度)将显着降低,并且观察该有趣的量子三临界点的前景大大扩大。此外,当固定拉曼强度增加拉曼耦合强度时,一系列量子三临界点准周期地出现 87 b 密度。在里面 23 BEC,两个超精细状态 23 原子在驱动参数空间的合适区域内可以互溶。结果是, 23 系统将以典型密度停留在具有较小拉曼频率的条纹相中,从而扩大了相图中的条纹相区域。另外,在这种情况下不存在量子三临界点 23 系统被观察到,这与 87 b  系统。
更新日期:2020-11-01
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