Gaussian impurity moving through a Bose-Einstein superfluid
arXiv:1610.04125 · doi:10.1016/j.physb.2017.06.038
Abstract
In this paper a Gaussian impurity moving through an equilibrium Bose-Einstein condensate at T = 0 is studied. The problem can be described by a Gross-Pitaevskii equation, which is solved perturbatively. The analysis is done for systems of 2 and 3 spatial dimensions and generalises the work by [G.E. Astrakharchik and L.P. Pitaevskii, Phys. Rev. A 70, 013608 (2004)]. The Bogoliubov equation solutions for the condensate perturbed by a finite impurity are calculated in the co-moving frame, which are formally equivalent up to a dimension dependent form factor for general dimensions. From those solutions the total energy of the perturbed system is determined as a function of the width and the amplitude of the moving Gaussian impurity and its velocity. Finally we derive the drag force the Gaussian impurity approximately experiences as it moves through the superfluid, which proofs the existence of a superfluid phase for finite extensions of the impurities below the speed of sound and that the force increases monotonically with velocity until it decreases again.
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Cited by in corpus (10)
- Many-Body Dissipative Flow of a Confined Scalar Bose-Einstein Condensate Driven by a Gaussian Impurity
- Mean-field construction for spectrum of one-dimensional Bose polaron
- Critical Energy Dissipation in a Binary Superfluid Gas by a Moving Magnetic Obstacle
- Classical analogies for the force acting on an impurity in a Bose-Einstein condensate
- Shape of a sound wave in a weakly-perturbed Bose gas
- Beyond superfluidity in driven non-equilibrium Bose-Einstein condensates
- Half-quantum vortex generation in a two-component Bose-Einstein condensate by an oscillatory magnetic obstacle
- Vortex shedding patterns in holographic superfluids at finite temperature
- Drag force of a exciton-polariton condensate under non-resonant pumping
- Increasing the stability of a superfluid in a rotating necklace potential