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강상관계 물질 연구단
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Role of thermal friction in relaxation of turbulent Bose-Einstein condensates

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Title
Role of thermal friction in relaxation of turbulent Bose-Einstein condensates
Author(s)
Joon Hyun Kim; Woo Jin Kwon; Yong il Shin
Publication Date
2016-09
Journal
PHYSICAL REVIEW A, v.94, no.3, pp.033612 -
Publisher
AMER PHYSICAL SOC
Abstract
In recent experiments, the relaxation dynamics of highly oblate, turbulent Bose-Einstein condensates (BECs) was investigated by measuring the vortex decay rates in various sample conditions [Phys. Rev. A 90, 063627 (2014)PLRAAN1050-294710.1103/PhysRevA.90.063627] and, separately, the thermal friction coefficient α for vortex motion was measured from the long-time evolution of a corotating vortex pair in a BEC [Phys. Rev. A 92, 051601(R) (2015)PLRAAN1050-294710.1103/PhysRevA.92.051601]. We present a comparative analysis of the experimental results, and find that the vortex decay rate Γ is almost linearly proportional to α. We perform numerical simulations of the time evolution of a turbulent BEC using a point-vortex model equipped with longitudinal friction and vortex-antivortex pair annihilation, and observe that the linear dependence of Γ on α is quantitatively accounted for in the dissipative point-vortex model. The numerical simulations reveal that thermal friction in the experiment was too strong to allow for the emergence of a vortex-clustered state out of decaying turbulence. © 2016 American Physical Society
URI
http://pr.ibs.re.kr/handle/8788114/3049
ISSN
2469-9926
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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