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Critical Energy Dissipation in a Binary Superfluid Gas by a Moving Magnetic Obstacle

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Title
Critical Energy Dissipation in a Binary Superfluid Gas by a Moving Magnetic Obstacle
Author(s)
Kim, Joon Hyun; Deokhwa Hong; Kyuhwan Lee; Yong-il Shin
Publication Date
2021-08-27
Journal
Physical Review Letters, v.127, no.9
Publisher
American Physical Society
Abstract
© 2021 American Physical Society.We study the critical energy dissipation in an atomic superfluid gas with two symmetric spin components by an oscillating magnetic obstacle. Above a certain critical oscillation frequency, spin-wave excitations are generated by the magnetic obstacle, demonstrating the spin superfluid behavior of the system. When the obstacle is strong enough to cause density perturbations via local saturation of spin polarization, half-quantum vortices (HQVs) are created for higher oscillation frequencies, which reveals the characteristic evolution of critical dissipative dynamics from spin-wave emission to HQV shedding. Critical HQV shedding is further investigated using a pulsed linear motion of the obstacle, and we identify two critical velocities to create HQVs with different core magnetization.
URI
https://pr.ibs.re.kr/handle/8788114/10365
DOI
10.1103/PhysRevLett.127.095302
ISSN
0031-9007
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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