Symmetry breaking of localized discrete matter waves induced by spin–orbit coupling

Abdullaev, Fatkhulla and Salerno, Mario (2015) Symmetry breaking of localized discrete matter waves induced by spin–orbit coupling. Physics Letters A, 379. pp. 2252-2256. ISSN 0375-9601

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Abstract

We study localized nonlinear excitations of a dilute Bose–Einstein condensate (BEC) with spin–orbit coupling in a deep optical lattice (OL). For this we introduce a tight-binding model that includes the spin–orbit coupling (SOC) at the discrete level in the form of a generalized discrete nonlinear Schrödingerequation. Existence and stability of discrete solitons of different symmetry types is demonstrated. Quite interestingly, we find three distinctive regions in which discrete solitons undergo spontaneously symmetry breaking, passing from on-site to inter-site and to asymmetric, simply by varying the interatomic interactions. Existence ranges of discrete solitons with inter-site symmetry depend on SOC and shrink to zero as the SOC parameter is increased. Asymmetric discrete solitons appear as novel excitations specific of the SOC. Possible experimental implementation of these results is briefly discussed.

Item Type:	Article (Journal)
Additional Information:	7021/44268
Uncontrolled Keywords:	Matter waves Multicomponent condensates Spinor condensates Bose–Einstein condensates in periodic potentials Solitons
Subjects:	Q Science > QC Physics
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Physics
Depositing User:	Prof Fatkhulla Abdullaev
Date Deposited:	19 Aug 2015 09:52
Last Modified:	08 Aug 2017 10:48
URI:	http://irep.iium.edu.my/id/eprint/44268

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