JOSEPHSON EFFECT IN LOW-CAPACITANCE SUPERCONDUCTOR NORMAL-METAL SUPERCONDUCTOR SYSTEMS

被引:26
|
作者
BAUERNSCHMITT, R
SIEWERT, J
NAZAROV, YV
ODINTSOV, AA
机构
[1] UNIV KARLSRUHE,INST THEORET FESTKORPERPHYS,D-76128 KARLSRUHE,GERMANY
[2] UNIV KARLSRUHE,LEHRSTUHL THEORET CHEM,INST PHYS CHEM & ELEKTROCHEM,D-76128 KARLSRUHE,GERMANY
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 06期
关键词
D O I
10.1103/PhysRevB.49.4076
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The transport properties of a small superconductor-normal-metal-superconducting tunnel junction can be controlled by a gate electrode coupled capacitively to the central island. We evaluate the critical Josephson current I(c) through such a system as a function of the gate voltage V(g) taking into account parity effects in the superconductors. The dependence I(c)(V(g)) shows resonant singularities and has a qualitatively different character for DELTA < E(C) and DELTA > E(C), DELTA being the superconducting gap and E(C) = e2/2C being the charging energy. Due to the sweeping of the gate voltage, the system can be driven to states which are metastable with respect to a change of the number of electrons on the central island. Since the lifetime of the metastable states can be macroscopically large, one can observe a remarkable bistability of the Josephson current. A weak magnetic field supresses the interference of the electrons propagating through the central electrode, and, consequently, the magnitude of the critical current.
引用
收藏
页码:4076 / 4081
页数:6
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