BLOCH OSCILLATIONS AND COULOMB BLOCKADE OF COOPER PAIR TUNNELING IN ULTRASMALL JOSEPHSON-JUNCTIONS

被引：8

作者：

KUZMIN, LS ^{[1
]}

HAVILAND, DB ^{[1
]}

机构：

[1] MV LOMONOSOV STATE UNIV,DEPT PHYS,CRYOELECTR LAB,MOSCOW 119899,USSR

来源：

PHYSICA SCRIPTA | 1992年 / T42卷

关键词：

D O I：

10.1088/0031-8949/1992/T42/029

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have studied charging effects in ultrasmall aluminum or lead alloy Josephson junctions (S almost-equal-to 0.01-0.02 mum2) protected from the shunting impedance of the external circuit by high resistance leads with R almost-equal-to 100-300 kOMEGA. Measurements of the single junctions have shown two new effects predicted by theory: the Coulomb blockade of Cooper pair tunneling and the time correlation of individual Cooper pair tunneling events (so-called Bloch oscillations). The former effect was observed for a wide range of Josephson coupling energies less than and grater than the charging energy. Bloch oscillations were indicated by phase locking to an external signal of frequency 0.4 to 10 GHz for Josephson energies close to charging energy. The shape of the current-voltage characteristics and the bandwidth of Bloch oscillations as measures from the derivative dV/dI, were analyzed within the context of three different theoretical models.

引用

页码：171 / 176

页数：6

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