Quantum Effects in Resistance-Shunted Josephson Junctions
Abstract
Thermodynamics and transport properties of resistance-shunted Josephson junctions are studied theoretically in the tight-binding limit E_C/E_J<<1, where E_C and E_J are a charging energy and a Josephson coupling energy respectively. Based on a phenomenological harmonic-oscillator model, weak coupling region K=R_Q/R<<1 is analytically studied, where R and R_Q=h/(2e)^2 are a shunted resistance and the quantum resistance. In addition to the effective bandwidth, we find that this multi-level system genuinely has a novel crossover at lower energy below which the density of states becomes strongly degenerate. These two energy scales control the linear DC responses, optical responses, and nonlinear I-V characteristics. The lower energy crossover indicates the existence of a new class of strongly-correlated phenomena beyond the framework of the Kondo problem.
Cite
@article{arxiv.cond-mat/9908192,
title = {Quantum Effects in Resistance-Shunted Josephson Junctions},
author = {Takeo Kato and Masatoshi Imada},
journal= {arXiv preprint arXiv:cond-mat/9908192},
year = {2007}
}
Comments
10 pages, 7 figures