Dragging spin–orbit-coupled solitons by a moving optical lattice. (22nd December 2021)

• Record Type: Journal Article
• Authors: Sakaguchi, Hidetsugu; Hirano, Fumihide; Malomed, Boris A
• Is Part Of: Journal of physics. Volume 54:Number 24(2021)
• Publication Date: 2021-12-22
• Subjects: soliton -- Bose–Einstein condensates -- spin–orbit coupling -- moving optical lattice; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/ac461d
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: It is known that the interplay of the spin–orbit-coupling (SOC) and mean-field self-attraction creates stable two-dimensional (2D) solitons (ground states) in spinor Bose–Einstein condensates. However, SOC destroys the system's Galilean invariance, therefore moving solitons exist only in a narrow interval of velocities, outside of which the solitons suffer delocalization. We demonstrate that the application of a relatively weak moving optical lattice (OL), with the 2D or quasi-1D structure, makes it possible to greatly expand the velocity interval for stable motion of the solitons. The stability domain in the system's parameter space is identified by means of numerical methods. In particular, the quasi-1D OL produces a stronger stabilizing effect than its full 2D counterpart. Some features of the domain are explained analytically.