论文标题
在玻色网凝结物中共同相互作用的杂质的理论
Theory of a resonantly interacting impurity in a Bose-Einstein condensate
论文作者
论文摘要
我们研究了与单个杂质颗粒的强相互作用中的Bose-Einstein冷凝物。尽管近年来这种情况引起了极大的兴趣，但由于Bogoliubov理论在共鸣附近引起的不稳定性，强大耦合的政权仍然无法访问大多数方法。我们提出了总比塔维斯基理论的非局部扩展，该理论没有这种差异，并且不需要在任何相互作用势中使用天生的近似值。我们发现有吸引力和排斥极性之间的新动态过渡状态，在达到平衡之前，相互作用淬灭会导致有限数量的相干振荡和接触参数。
We investigate a Bose-Einstein condensate in strong interaction with a single impurity particle. While this situation has received considerable interest in recent years, the regime of strong coupling remained inaccessible to most approaches due to an instability in Bogoliubov theory arising near the resonance. We present a nonlocal extension of Gross-Pitaevskii theory that is free of such divergences and does not require the use of the Born approximation in any of the interaction potentials. We find a new dynamical transition regime between attractive and repulsive polarons, where an interaction quench results in a finite number of coherent oscillations in the density profiles of the medium and in the contact parameter before equilibrium is reached.
