Impact of the Injection Protocol on an Impurity's Stationary State

Oleksandr Gamayun, Oleg Lychkovskiy, Evgeni Burovski, Matthew Malcomson, Vadim V. Cheianov, Mikhail B. Zvonarev

    Research output: Contribution to journalArticlepeer-review

    26 Citations (Scopus)


    We examine stationary-state properties of an impurity particle injected into a one-dimensional quantum gas. We show that the value of the impurity's end velocity lies between zero and the speed of sound in the gas and is determined by the injection protocol. This way, the impurity's constant motion is a dynamically emergent phenomenon whose description goes beyond accounting for the kinematic constraints of the Landau approach to superfluidity. We provide exact analytic results in the thermodynamic limit and perform finite-size numerical simulations to demonstrate that the predicted phenomena are within the reach of the ultracold gas experiments.

    Original languageEnglish
    Article number220605
    JournalPhysical Review Letters
    Issue number22
    Publication statusPublished - 1 Jun 2018


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