Quantitative study of macroscopic quantum tunneling in a dc SQUID: A system with two degrees of freedom

被引：39

作者：

Li, SX ^{[1
]}

Yu, Y

Zhang, Y

Qiu, W

Han, S

Wang, Z

机构：

[1] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA

[2] Minist Posts & Telecommun, Commun Res Lab, KARC, Nishi Ku, Kobe, Hyogo 65124, Japan

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 89卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.89.098301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

To test whether the theory of macroscopic quantum tunneling (MQT) is applicable to systems with 2 degrees of freedom, we experimentally investigated the switching current distribution of a dc SQUID. Using sample parameters determined from measurements at T=4.2 K, we are able to make quantitative comparison to the theories from 8 mK to 4.2 K. The excellent agreement between the data and the MQT theory demonstrates that tunneling from the zero-voltage state of the dc SQUID is well described by the quantum mechanics.

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页数：4

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