Half-Quantum Vortices in Thin Film of Superfluid 3He
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概要
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Stability of a half-quantum vortex (HQV) in superfluid 3He has been discussed recently by Kawakami et al. in Phys. Rev. B 79 (2009) 092506. We further extend this work here and consider the A2 phase of superfluid 3He confined in thin slab geometry and analyze the HQV realized in this setting. Solutions of HQV and singly quantized singular vortex are evaluated numerically by solving the Ginzburg--Landau equation and respective first critical angular velocities are obtained by employing these solutions. We show that the HQV in the A2 phase is stable near the boundary between the A2 and A1 phases. It is found that temperature and magnetic field must be fixed first in the stable region and subsequently the angular velocity of the system should be increased from zero to a larger value to create a HQV with a sufficiently large probability. The angular velocity and the magnetic field strength required for HQV formation are found to be experimentally feasible.
- 2012-10-15
著者
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Machida Kazushige
Department Of Physics Kyoto University
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Kondo Kenji
Department Of Electrical Engineering Faculty Of Science And Technology Keio University:fuji Electric
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Ohmi Tetsuo
Research Center for Quantum Computing, Interdisciplinary Graduate School of Science and Engineering, Kinki University, Higashiosaka, Osaka 577-8502, Japan
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Kawakami Takuto
Department of Physics, Okayama University, Okayama 700-8530, Japan
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Tsutsumi Yasumasa
Condensed Matter Theory Laboratory, RIKEN, Wako, Saitama 351-0198, Japan
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NAKAHARA Mikio
Department of Mathematics and Physics, Kinki University
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