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arXiv 1912.04434cond-mat.quant-gasquant-ph
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基态凝聚态通过准绝热循环生成非平衡态stationary state

Generating nonequilibrium stationary state from ground state condensate through an almost-adiabatic cycle

Atushi Tanaka, Takaaki Nakamura, Taksu Cheon

摘要:

研究表明,在准一维盒阱中,弱相互作用玻色粒子的基态可以通过绝热循环操作转变为激发定态,这种绝热循环操作涉及到相互作用强度的猝灭:在循环过程中施加一个尖锐的杂质势,并改变其强度,诱导出一个呈现布居数反转的非平衡定态.这个过程是稳健的,因为所得的稳态几乎与循环的细节无关,例如杂质的位置,只要循环离临界区域足够远。粒子数反转失败的情况下,由于强粒子间的相互作用也检查。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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