MEAN-FIELD THEORY FOR UNDERDAMPED JOSEPHSON-JUNCTION ARRAYS WITH AN OFFSET VOLTAGE

被引:47
作者
RODDICK, E
STROUD, D
机构
[1] Department of Physics, Ohio State University, Columbus
关键词
D O I
10.1103/PhysRevB.48.16600
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study a model Hamiltonian for superconductivity in underdamped Josephson-junction arrays in the presence of an offset voltage between the array and the substrate. We develop an approximate zero-temperature (T = 0) phase diagram as a function of Josephson coupling, charging energy, and offset voltage, using a simple Hartree-type mean-field approximation. With diagonal charging energy, the calculated phase diagram is periodic in offset voltage, in agreement with previous results. At a special value of this voltage such that states with n and n + 1 Cooper pairs per gain are degenerate, only an infinitesimal Josephson coupling is needed to establish long-range phase coherence in this approximation. With both diagonal and nearest-neighbor charging energies, the T = 0 phase diagram has two types of insulating lobes with different kinds of charge order, and two types of superconducting regions. One of these is a ''supersolid'' in which long-range phase coherence coexists with a frozen charge-density wave. We briefly discuss connections to previous calculations, and possible relevance to experiments.
引用
收藏
页码:16600 / 16606
页数:7
相关论文
共 36 条
[1]   EFFECT OF CHARGING ENERGY ON SUPERCONDUCTIVITY IN GRANULAR METAL-FILMS [J].
ABELES, B .
PHYSICAL REVIEW B, 1977, 15 (05) :2828-2829
[2]  
ANDERSON PW, 1964, LECTURE MANY BODY PR, V2
[3]  
Averin D. V., 1991, MESOSCOPIC PHENOMENA
[4]   PHASE-TRANSITIONS IN DISSIPATIVE JOSEPHSON CHAINS [J].
BOBBERT, PA ;
FAZIO, R ;
SCHON, G ;
ZIMANYI, GT .
PHYSICAL REVIEW B, 1990, 41 (07) :4009-4016
[5]   QUANTUM PHASE-TRANSITIONS AND COMMENSURABILITY IN FRUSTRATED JOSEPHSON JUNCTION ARRAYS [J].
BRUDER, C ;
FAZIO, R ;
KAMPF, A ;
VANOTTERLO, A ;
SCHON, G .
PHYSICA SCRIPTA, 1992, T42 :159-170
[6]   EFFECT OF QUASI-PARTICLE TUNNELING ON QUANTUM-PHASE FLUCTUATIONS AND THE ONSET OF SUPERCONDUCTIVITY IN ANTIGRANULOCYTES FILMS [J].
CHAKRAVARTY, S ;
KIVELSON, S ;
ZIMANYI, GT ;
HALPERIN, BI .
PHYSICAL REVIEW B, 1987, 35 (13) :7256-7259
[7]   ONSET OF GLOBAL PHASE COHERENCE IN JOSEPHSON-JUNCTION ARRAYS - A DISSIPATIVE PHASE-TRANSITION [J].
CHAKRAVARTY, S ;
INGOLD, GL ;
KIVELSON, S ;
LUTHER, A .
PHYSICAL REVIEW LETTERS, 1986, 56 (21) :2303-2306
[8]   QUANTUM FLUCTUATIONS IN TWO-DIMENSIONAL SUPERCONDUCTORS [J].
DONIACH, S .
PHYSICAL REVIEW B, 1981, 24 (09) :5063-5070
[9]   CHARGE AND VORTEX DYNAMICS IN ARRAYS OF TUNNEL-JUNCTIONS [J].
FAZIO, R ;
SCHON, G .
PHYSICAL REVIEW B, 1991, 43 (07) :5307-5320
[10]  
FISHER MPA, 1989, PHYS REV B, V40, P546, DOI [10.1103/PhysRevB.40.546, 10.1063/1.38820]