Enhanced macroscopic quantum tunneling in Bi2Sr2CaCu2O8+δ intrinsic Josephson-junction stacks

被引：134

作者：

Jin, XY ^{[1
]}

Lisenfeld, J ^{[1
]}

Koval, Y ^{[1
]}

Lukashenko, A ^{[1
]}

Ustinov, AV ^{[1
]}

Müller, P ^{[1
]}

机构：

[1] Univ Erlangen Nurnberg, Inst Phys 3, D-91058 Erlangen, Germany

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.96.177003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated macroscopic quantum tunneling in Bi2Sr2CaCu2O8+delta intrinsic Josephson junctions at millikelvin temperatures using microwave irradiation. Measurements show that the escape rate for uniformly switching stacks of N junctions is about N-2 times higher than that of a single junction having the same plasma frequency. We argue that this gigantic enhancement of the macroscopic quantum tunneling rate in stacks is boosted by current fluctuations which occur in the series array of junctions loaded by the impedance of the environment.

引用

页数：4

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