理想玻色气体中自旋杂质量子动力学
Quantum dynamics of spinful impurity in ideal Bose gas
- Ivan Franko National University of Lviv（利沃夫伊万·弗兰科国立大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文研究理想玻色气体中自旋杂质在横向拉比场下的淬火动力学，提出类平均场近似，预测自旋退相干显著加速。
AI中文摘要：
我们讨论了一个由横向拉比场中的单个自旋杂质与无相互作用的三维和二维玻色子浴组成的孤立系统的淬火动力学。具体而言，我们考虑了玻色子和一个自旋-1/2粒子的演化，它们分别初始制备于玻色-爱因斯坦凝聚态和磁基态，并开启了依赖于自旋的接触玻色子-杂质相互作用。应用一种原创的类平均场近似，该近似自然反映了玻色子浴的统计效应，我们计算了平均杂质自旋随时间变化的分量以及初始时刻与任意时刻之间波函数的重叠。一个关键预测是，与使用Chevy类拟设获得的结果相比，自旋自由度的退相干（热化）动力学显著加速。
英文摘要：
We discuss the quench dynamics of an isolated system composed of a single spinful impurity in the transverse Rabi field and bath of non-interacting three- and two-dimensional bosons. Specifically, we consider the evolution of bosons and a spin-$\frac{1}{2}$ particle, initially prepared in a Bose-Einstein condensate state and a magnetic ground state, respectively, with the spin-dependent contact boson-impurity interaction switched on. Applying an original mean-field-like approximation, which naturally reflects the statistical effects of the bosonic bath, we calculate time-dependent components of the average impurity spin and the overlap of the wave function between initial and arbitrary time moments. A key prediction is a substantial speed-up in the decoherence (thermalization) dynamics of the spin degree of freedom compared to results obtained with the Chevy-like ansatz.
