Quantum Phase Transitions in Josephson Junction Chains
摘要
We investigate the quantum phase transition in a one-dimensional chain of ultra-small superconducting grains, considering both the self- and junction capacitances. At zero temperature, the system is transformed into a two-dimensional system of classical vortices, where the junction capacitance introduces anisotropy in the interaction between vortices. This leads to the superconductor-insulator transition of the Berezinskii-Kosterlitz-Thouless type, as the ratios of the Josephson coupling energy to the charging energies are varied. It is found that the junction capacitance plays a role similar to that of dissipation and tends to suppress quantum fluctuations; nevertheless the insulator region survives even for arbitrarily large values of the junction capacitance.
引用
@article{arxiv.cond-mat/9711046,
title = {Quantum Phase Transitions in Josephson Junction Chains},
author = {Mahn-Soo Choi and J. Yi and M. Y. Choi and J. Choi and S. -I. Lee},
journal= {arXiv preprint arXiv:cond-mat/9711046},
year = {2009}
}
备注
REVTeX+5 EPS figures, To appear in PRB Rapids