Evidence of two-dimensional macroscopic quantum tunneling of a current-biased dc SQUID

被引：38

作者：

Balestro, F

Claudon, J

Pekola, JP

Buisson, O

机构：

[1] CNRS, Ctr Rech Tres Basses Temp, Lab Associe Univ Joseph Fourier, F-38042 Grenoble 9, France

[2] Aalto Univ, Low Temp Lab, Espoo 02015, Finland

来源：

PHYSICAL REVIEW LETTERS | 2003年 / 91卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.91.158301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The escape probability out of the superconducting state of a hysteretic dc SQUID has been measured at different values of the applied magnetic flux. At low temperatures, the escape current and the width of the probability distribution are temperature independent but they depend on flux. Experimental results do not fit the usual one-dimensional macroscopic quantum tunneling (MQT) law but are perfectly accounted for by the two-dimensional MQT behavior as we propose here. Near zero flux, our data confirms the recent MQT observation in a dc SQUID [S. Li et al., Phys. Rev. Lett. 89, 98301 (2002)10.1103/PhysRevLett.89.098301 (2002)].

引用

页数：4

共 22 条

[1]

[Anonymous], THESIS U J FOURIER

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