Decay of Phase-Imprinted Dark Soliton in Bose-Einstein Condensate at Nonzero Temperature
Decay of Phase-Imprinted Dark Soliton in Bose-Einstein Condensate at Nonzero Temperature
复制标题
非零温度下玻色-爱因斯坦凝聚体中相印迹暗孤子的衰变
DOI：
10.1007/s10909-019-02180-z
复制
发表时间：
2019
影响因子：
2
通讯作者：
Tetsuro Nikuni
中科院分区：
文献类型：
--
作者：
Hiroki Ohya;Shohei Watabe;Tetsuro Nikuni
利用投影Gross-Pitaevskii方程研究了非零温度下二维玻色-爱因斯坦凝聚体中由相位印记方法产生的暗孤子的弛豫动力学.在绝对零度下，暗孤子的衰变具有蛇形不稳定性。在非零温度下，正如预期的那样，我们发现，这种蛇不稳定性不能被视为在绝对零度的情况下，因为存在的热波动清楚。我们发现，由相对于相位印记初始状态的保真度的半衰期定义的衰减率的能量依赖性，示出了幂律衰减，并且在大的能量极限中接近非零值。
We study relaxation dynamics of dark soliton, created by a phase-imprinted method, in a two-dimensional trapped Bose–Einstein condensate at nonzero temperatures by using the projected Gross–Pitaevskii equation. At absolute zero temperature, a dark soliton is known to decay with a snake instability. At nonzero temperature, as expected, we find that this snake instability cannot be seen as clearly as in the absolute zero temperature case because of the presence of thermal fluctuations. We find that the energy dependence of the decay rate, defined by the half-life of the fidelity with respect to the phase-imprinted initial state, shows a power law decay and approaches a nonzero value in the large energy limit.