Quantum terahertz electrodynamics and macroscopic quantum tunneling in layered superconductors.
Quantum terahertz electrodynamics and macroscopic quantum tunneling in layered superconductors.
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DOI：
10.1103/physrevlett.98.077002
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发表时间：
2007-02
影响因子：
8.6
通讯作者：
S. Savel’ev;A. Rakhmanov;F. Nori
中科院分区：
文献类型：
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作者：
S. Savel’ev;A. Rakhmanov;F. Nori
本文导出了层状超导体中约瑟夫森等离子体波的量子场论，它描述了两种类型的相互作用的约瑟夫森等离子体波玻色子（一重一轻）。本文提出了一种增强本征约瑟夫森结中宏观量子隧穿的机制。由于层状超导体中结之间的长程相互作用，计算出的MQT逃逸率γ与堆叠中的结数具有非线性关系。我们发现，量子和热逃逸之间的交叉温度增加时，增加的结的数量。这使我们能够定量描述引人注目的最近的实验中Bi2Sr2CaCu2O8+三角洲堆栈。
We derive a quantum field theory of Josephson plasma waves (JPWs) in layered superconductors, which describes two types of interacting JPW bosonic quanta (one heavy and one lighter). We propose a mechanism of enhancement of macroscopic quantum tunneling (MQT) in stacks of intrinsic Josephson junctions. Because of the long-range interaction between junctions in layered superconductors, the calculated MQT escape rate Gamma has a nonlinear dependence on the number of junctions in the stack. We show that the crossover temperature between quantum and thermal escape increases when increasing the number of junctions. This allows us to quantitatively describe striking recent experiments in Bi2Sr2CaCu2O8+delta stacks.