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| Hydrodynamics of Quantum Vortices in Two Dimensions |
| 2017-04-26
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| Institute of Theoretical Physics | | Chinese Academy of Sciences | | Key Laboratory of Theoretical Physics | | Seminar | | Title 题目 | Hydrodynamics of Quantum Vortices in Two Dimensions | | Speaker 报告人 | Dr. Xiaoquan Yu | | Affiliation 所在单位 | University of Otago, New Zealand | | Date 日期 | 3:00pm, Wednesday, Apr. 26, 2017 | | Venue 地点 | Room 6420 ITP New Building | | Abstract 摘要 | In two dimensional superfluids a large number of quantum vortices with positive and negative circulations behave as an inviscid fluid on large scales. Two hydrodynamical velocities are introduced to describe this emergent binary vortex fluid, via vortex number current and vortex change current. The velocity field associated with the vortex number current evolves according to a hydrodynamic equation, subject to an anomalous stress absent from Euler'€™s equation. In contrast to the chiral vortex fluid containing only like-sign vortices [1], the binary vortex fluid is compressible and the orbital angular momentum is not conserved, as characterized by an asymmetric Cauchy stress tensor [2]. Dissipation effects due to thermal friction and vortex-sound interactions induce an effective damping rate, an anomalous viscous stress tensor, and a coefficient of second viscosity.
[1] P. Wiegmann and A. G. Abanov, Phys. Rev. Lett. 113, 034501(2014).
[2] X. Yu, A. S. Bradley, arXiv:1704.05410 | | Contact person 所内联系人 | Su Yi |
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