PHASE-TRANSITIONS IN DISSIPATIVE JOSEPHSON CHAINS - MONTE-CARLO RESULTS AND RESPONSE FUNCTIONS

被引:47
作者
BOBBERT, PA
FAZIO, R
SCHON, G
ZAIKIN, AD
机构
[1] PN LEBEDEV PHYS INST,DEPT PHYS,MOSCOW,USSR
[2] UNIV CATANIA,FAC INGN,IST FIS,I-95124 CATANIA,ITALY
来源
PHYSICAL REVIEW B | 1992年 / 45卷 / 05期
关键词
D O I
10.1103/PhysRevB.45.2294
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A chain of Josephson junctions shunted by Ohmic resistors undergoes phase transitions at zero temperature that result from the interplay between quantum fluctuations induced by charging effects and the dissipation. The quantum-mechanical partition function expressed in terms of phase slips in space-time can be mapped onto that of a two-dimensional Coulomb gas. Due to the dissipation the interaction is anisotropic. Despite the simplicity of the model, there is no general agreement about the phase diagram and the response functions. We have performed Monte Carlo simulations to determine the zero-temperature phase boundaries. We find four phases with the absence or presence of global or local order, in all combinations. We discuss the response functions in the different phases and find interesting transport properties.
引用
收藏
页码:2294 / 2304
页数:11
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