Critical velocity of a mobile impurity in one-dimensional quantum liquids.
Critical velocity of a mobile impurity in one-dimensional quantum liquids.
复制标题
一维量子液体中移动杂质的临界速度。
DOI：
10.1103/physrevlett.108.207001
复制
发表时间：
2012
影响因子：
8.6
通讯作者：
Schecter M
中科院分区：
文献类型：
--
作者：
Schecter M
我们在一维空间中研究了超流体临界速度的概念。结果表明，对于质量超过临界质量的重杂质，在外加驱动力的作用下，色散会形成周期性的亚稳态分支，导致动力学的剧烈变化。与光滑的Bloch振荡不同，重杂质沿着亚稳态分支爬升，直到到达分支终止点或经历随机隧穿事件，两者都导致速度突变和能量损失。这将导致杂质漂移速度对小力的非解析依赖关系。
We study the notion of superfluid critical velocity in one spatial dimension. It is shown that, for heavy impurities with massexceeding a critical mass, the dispersion develops periodic metastable branches resulting in dramatic changes of dynamics in the presence of an external driving force. In contrast to smooth Bloch oscillations for, a heavy impurity climbs metastable branches until it reaches a branch termination point or undergoes a random tunneling event, both leading to an abrupt change in velocity and an energy loss. This is predicted to lead to a nonanalytic dependence of the impurity drift velocity on small forces.