Low Temperature Physics: 44, 1032 (2018); https://doi.org/10.1063/1.5055844
Fizika Nizkikh Temperatur: Volume 44, Number 10 (October 2018), p. 1316-1325    ( to contents , go back )

Analogues of Josephson junctions and black hole event horizons in atomic Bose–Einstein condensates

A.I. Yakimenko, O.I. Matsyshyn, A.O. Oliinyk, V.M. Biloshytskyi, O.G. Chelpanova, and S.I. Vilchynskii

Department of Physics, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska Street, Kyiv 01601, Ukraine
E-mail: sivil@ukr.net

Received March 13, 2018, published online August 28, 2018

Abstract

We study dynamical processes in coherently coupled atomic Bose–Einstein condensates. Josephson effects in ring-shaped and dumbbell geometries are theoretically investigated. Conditions for observation of the Josephson effect are revealed. We found that multicharged persistent current in toroidal condensate can be robust even for supersonic atomic flow. In numerical simulations the acoustic analogues of event horizon in quantized superflow were observed. These theoretical finding open perspectives for investigation of Bose Josephson junctions and quantum aspects of acoustic analogue of Hawking radiation in existing experimental setups.

Key words: Bose–Einstein condensation, Josephson effect.

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