Volume 103, Number 2, July 2013
|Number of page(s)||6|
|Published online||06 August 2013|
Matter-wave dark solitons and their excitation spectra in spin-orbit coupled Bose-Einstein condensates
1 Department of Physics, University of Athens, Panepistimiopolis - Zografos, Athens 157 84, Greece, EU
2 Zentrum für Optische Quantentechnologien, Universität Hamburg - Luruper Chaussee 149, 22761 Hamburg, Germany, EU
3 Department of of Mathematics and Statistics, University of Massachusetts - Amherst, MA 01003-9305, USA
4 The Hamburg Centre for Ultrafast Imaging - Luruper Chaussee 149, 22761 Hamburg, Germany, EU
Received: 5 April 2013
Accepted: 29 June 2013
We present three types of dark solitons in quasi–one-dimensional spin-orbit coupled repulsive Bose-Einstein condensates. Among these families, two are always stable, while the third one is only stable sufficiently close to the linear regime. The solitons' excitation spectra reveal the potential existence of a second anomalous mode. While the first such mode describes the soliton oscillatory motion in a parabolic trap, the second, when present, reflects the double-well structure of the underlying single-particle spectrum. This novel mode results in moving density stripes in the vicinity of the soliton core, or in an out-of-phase oscillation of the constituent components, with little effect on the nearly stationary striped total density of the composite soliton.
PACS: 05.45.Yv – Solitons / 03.75.Mn – Multicomponent condensates; spinor condensates / 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow
© EPLA, 2013
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