Quantum Tera-Hertz electrodynamics in Layered Superconductors

Details Quantum Tera-Hertz electrodynamics in Layered Superconductors Quantum Tera-Hertz electrodynamics in Layered Superconductors

2006-07-19

arxiv.org/abs/cond-mat/0607479v1

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures

Scientific paper

In close analogy to quantum electrodynamics, we derive a quantum field theory of Josephson plasma waves (JPWs) in layered superconductors (LSCs), which describes two types of interacting JPW bosonic quanta: one massive and the other almost-massless. We also calculate the amplitude of their decay and scattering. We propose a mechanism of enhancement of macroscopic quantum tunneling (MQT) in stacks of intrinsic Josephson-junctions (SIJJs). Due to the long-range interactions between many junctions in the LSCs, the calculated MQT escape rate $\Gamma$ has a very nonlinear dependence on the number of junctions in the stack. This allows to quantitatively describe striking recent experiments in Bi2212 stacks.

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