1 6 M ar 2 00 6 Enhanced Macroscopic Quantum Tunneling in Bi 2 Sr 2 CaCu 2 O 8 + δ Intrinsic Josephson Junction Stacks
1 6 M ar 2 00 6 Enhanced Macroscopic Quantum Tunneling in Bi 2 Sr 2 CaCu 2 O 8 + δ Intrinsic Josephson Junction Stacks
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1 6 Mar 2 00 6 Bi 2 Sr 2 CaCu 2 O 8 + δ 本征约瑟夫森结堆栈中增强的宏观量子隧道
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. Müller
中科院分区：
文献类型：
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作者：
X. Y. Jin;J. Lisenfeld;Y. Koval;A. Lukashenko;A. V. Ustinov;P. Müller
我们已经在Milllikelvin温度下使用微波辐射研究了BI2SR2CACU2O8+δ的宏观量子隧道，该固有的Josephson连接表明，N连接的均匀切换堆栈的逃逸速率比具有同一质量质量的N型N端的n倍高。我们认为，堆栈中宏观量子隧道速率的这种巨大增强是由于环境阻抗加载的串联阵列中发生的当前波动所增强的。
We have investigated macroscopic quantum tunneling in Bi2Sr2CaCu2O8+δ 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 times higher than that of a single junction having the same plasma frequency. We argue that this gigantic enhancement of 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.