Quantum impurities: from mobile Josephson junctions to depletons

Michael Schecter, Dimitri M Gangardt, Alex Kamenev

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)
201 Downloads (Pure)


We overview the main features of mobile impurities moving in one-dimensional superfluid backgrounds by modeling it as a mobile Josephson junction, which leads naturally to the periodic dispersion of the impurity. The dissipation processes, such as radiative friction and quantum viscosity, are shown to result from the interaction of the collective phase difference with the background phonons. We develop a more realistic depleton model of an impurity-hole bound state that provides a number of exact results interpolating between the semiclassical weakly interacting picture and the strongly interacting Tonks–Girardeau regime. We also discuss the physics of a trapped impurity, relevant to current experiments with ultra cold atoms.
Original languageEnglish
JournalNew Journal of Physics
Issue number6
Publication statusPublished - 31 May 2016


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