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강상관계 물질 연구단
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Observation of Wall-Vortex Composite Defects in a Spinor Bose-Einstein Condensate

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Title
Observation of Wall-Vortex Composite Defects in a Spinor Bose-Einstein Condensate
Author(s)
Seji Kang; Sang Won Seo; Hiromitsu Takeuchi; Y. Shin
Publication Date
2019-03
Journal
PHYSICAL REVIEW LETTERS, v.122, no.9, pp.095301 -
Publisher
AMER PHYSICAL SOC
Abstract
We report the observation of spin domain walls bounded by half-quantum vortices (HQVs) in a spin-1 Bose-Einstein condensate with antiferromagnetic interactions. A spinor condensate is initially prepared in the easy-plane polar phase, and then, suddenly quenched into the easy-axis polar phase. Domain walls are created via the spontaneous Z2 symmetry breaking in the phase transition and the walls dynamically split into composite defects due to snake instability. The end points of the defects are identified as HQVs for the polar order parameter and the mass supercurrent in their proximity is demonstrated using Bragg scattering. In a strong quench regime, we observe that singly charged quantum vortices are formed with the relaxation of free wall-vortex composite defects. Our results demonstrate a nucleation mechanism for composite defects via phase transition dynamics. © 2019 American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6476
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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