期刊
PHYSICAL REVIEW A
卷 89, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.89.033636
关键词
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资金
- Special Account for Research Grants of the University of Athens
- Alexander von Humboldt Foundation
- Binational Science Foundation [2010239, NSF-CMMI-1000337, NSF-DMS-1312856]
- International Research Staff Exchange Scheme [IRSES-606096]
- US-AFOSR [FA9550-12-10332]
- Division Of Mathematical Sciences
- Direct For Mathematical & Physical Scien [1312856, 1309035] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1000337] Funding Source: National Science Foundation
We present families of beating dark-dark solitons in spin-orbit (SO) -coupled Bose-Einstein condensates. These families consist of solitons residing simultaneously in the two bands of the energy spectrum. The soliton components are characterized by two different spatial and temporal scales, which are identified by a multiscale expansion method. The solitons are beating ones, as they perform density oscillations. The characteristic frequency of the latter is relevant to Zitterbewegung (ZB) oscillations, which were recently observed in experiments with SO-coupled condensates [C. Qu et al., Phys. Rev. A 88, 021604(R) (2013); L. J. LeBlanc et al., New J. Phys. 15, 073011 (2013)]. We find that spin oscillations may occur, depending on the parity of each soliton branch, which consequently lead to ZB oscillations of the beating dark solitons. Analytical results are corroborated by numerical simulations, illustrating the robustness of the solitons.
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