Enhanced macroscopic quantum tunneling in Bi2Sr2CaCu2O8 + delta intrinsic Josephson-junction stacks.
Enhanced macroscopic quantum tunneling in Bi2Sr2CaCu2O8 + delta intrinsic Josephson-junction stacks.
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Bi2Sr2CaCu2O8 δ 本征约瑟夫森结堆栈中增强的宏观量子隧道效应。
DOI：
10.1103/physrevlett.96.177003
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发表时间：
2006
影响因子：
8.6
通讯作者：
P. Müller
中科院分区：
文献类型：
--
作者：
X. Jin;J. Lisenfeld;Y. Koval’;A. Lukashenko;A. V. Ustinov;P. Müller
We have investigated macroscopic quantum tunneling in Bi(2)Sr(2)CaCu(2)O(8 + delta) intrinsic Josephson junctions at millikelvin temperatures using microwave irradiation. Measurements show that the escape rate for uniformly switching stacks of Nu junctions is about Nu(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.
