Magnetic domains in spinor Bose-Einstein condensates

Matuszewski, Michał; Alexander, Tristram J.; Kivshar, Yuri S.

doi:10.1063/1.3499231

Cited by 2 publications

(1 citation statement)

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“…It is relevant to mention that multi-domain patterns were also reported in Ref. [30] in the spinor (three-component) BEC under the action of external magnetic field (without the SO coupling). An essential difference of our system is that the transition between different numbers of domains is controlled by the intrinsic strength of the SO coupling, rather than by an additionally introduced magnetic field.…”

Section: Zero Zeeman Splittingsupporting

confidence: 65%

Nonlinear modes in binary bosonic condensates with pseudo–spin-orbital coupling

et al. 2013

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We consider a binary Bose-Einstein condensate (BEC) with nonlinear repulsive interactions and linear spin-orbit (SO) and Zeeman-splitting couplings. In the presence of the trapping harmonicoscillator (HO) potential, we report the existence of even, odd, and asymmetric spatial modes. They feature alternating domains with opposite directions of the pseudo-spin, i.e., anti-ferromagnetic structures, which is explained by the interplay of the linear couplings, HO confinement, and repulsive self-interaction. The number of the domains is determined by the strength of the SO coupling. The modes are constructed analytically in the weakly nonlinear system. The dynamical stability of the modes is investigated by means of the Bogoliubov-de Gennes equations and direct simulations. A notable result is that the multi-domain-wall (DW) structures are stable, alternating between odd and even shapes, while the simplest single-DW structure is unstable. Thus, the system features a transition to the complex ground states under the action of the SO coupling. The addition of the Zeeman splitting transforms the odd modes into asymmetric ones via spontaneous symmetry breaking. The results suggest possibilities for switching the binary system between states with opposite (pseudo) magnetization by external fields, and realization of similar stable states and dynamical effects in solid-state and nonlinear-optical settings emulated by the SO-coupled BECs.

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Section: Zero Zeeman Splittingsupporting

confidence: 65%