Critical Velocity in the Presence of Surface Bound States in Superfluid 3He-B

被引：17

作者：

Zheng, P. ^{[1
]}

Jiang, W. G. ^{[1
]}

Barquist, C. S. ^{[1
]}

Lee, Y. ^{[1
]}

Chan, H. B. ^{[2
]}

机构：

[1] Univ Florida, Dept Phys, Gainesville, FL 32611 USA

[2] Hong Kong Univ Sci & Technol, Dept Phys, Kowloon, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW LETTERS | 2017年 / 118卷 / 06期

基金：

美国国家科学基金会;

关键词：

VIBRATING-WIRE; SUPERCONDUCTORS; BEHAVIOR; LIMIT; BREAKING; OBJECT; HE-4; GAS;

D O I：

10.1103/PhysRevLett.118.065301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A microelectromechanical oscillator with a gap of 1.25 mu m was immersed in superfluid He-3-B and cooled below 250 mu K at various pressures. Mechanical resonances of its shear motion were measured at various levels of driving force. The oscillator enters into a nonlinear regime above a certain threshold velocity. The damping increases rapidly in the nonlinear region and eventually prevents the velocity of the oscillator from increasing beyond the critical velocity which is much lower than the Landau critical velocity. We propose that this peculiar nonlinear behavior stems from the escape of quasiparticles from the surface bound states into the bulk fluid.

引用

页数：5

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