Generating a nonequilibrium stationary state from a ground-state condensate through an almost adiabatic cycle
Generating a nonequilibrium stationary state from a ground-state condensate through an almost adiabatic cycle
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DOI：
10.1103/physreva.102.013308
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发表时间：
2019-12
期刊：
影响因子：
--
通讯作者：
A. Tanaka;Takaaki Nakamura;T. Cheon
中科院分区：
文献类型：
--
作者：
A. Tanaka;Takaaki Nakamura;T. Cheon
结果表明，准一维盒陷阱中弱相互作用玻色粒子的基态可以通过涉及相互作用强度淬灭的绝热循环操作转换为激发稳态：施加尖锐的杂质势并且其强度在循环过程中变化，从而引起表现出粒子数反转的非平衡稳态。这个过程是鲁棒的，因为所产生的稳态几乎独立于循环的细节，例如杂质的位置，只要循环距离临界区域足够远。还检查了由于强粒子间相互作用而导致粒子数反转失败的情况。
It is shown that the ground state of weakly interacting Bose particles in a quasi one-dimensional box trap can be converted into an excited stationary state by an adiabatic cyclic operation that involves a quench of interaction strength: A sharp impurity potential is applied and its strength is varied during the cycle, which induces a nonequilibrium stationary state exhibiting the inversion of population. This process is robust in the sense that the resultant stationary state is almost independent of the details of the cycle, such as the position of the impurity as long as the cycle is far enough from critical regions. The case of the failure of the population inversion due to the strong interparticle interactions is also examined.