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Phys. Rev. A 75, 055601 (2007) [4 pages]

Čerenkov-like radiation in a binary superfluid flow past an obstacle

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H. Susanto1, P. G. Kevrekidis1, R. Carretero-González2, B. A. Malomed3, D. J. Frantzeskakis4, and A. R. Bishop5
1Department of Mathematics and Statistics, University of Massachusetts, Amherst, Massachusetts 01003-4515, USA
2Nonlinear Dynamical Systems Group, Department of Mathematics and Statistics, and Computational Science Research Center, San Diego State University, San Diego, California, 92182-7720, USA
3Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel
4Department of Physics, University of Athens, Panepistimiopolis, Zografos, Athens 15784, Greece
5Theoretical Division and Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

Received 18 January 2007; published 8 May 2007

We consider the dynamics of two coupled miscible Bose-Einstein condensates, when an obstacle is dragged through them. The existence of two different speeds of sound provides the possibility for three dynamical regimes: when both components are subcritical, we do not observe nucleation of coherent structures; when both components are supercritical they both form dark solitons in one dimension (1D) and vortices or rotating vortex dipoles in two dimensions; in the intermediate regime, we observe the nucleation of a structure in the form of a dark-antidark soliton in 1D; the 2D analog of such a structure, a vortex-lump, is also observed.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevA.75.055601
DOI:
10.1103/PhysRevA.75.055601
PACS:
03.75.−b, 52.35.Mw
 
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