MIXER OF SHORT WEAK-LINK USING A RESONANCE EFFECT DUE TO MULTIPLE ANDREEV REFLECTIONS AT SUBGAP VOLTAGES

被引：12

作者：

MATSUI, T ^{[1
]}

OHTA, H ^{[1
]}

机构：

[1] INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN

来源：

IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY | 1995年 / 5卷 / 02期

基金：

日本科学技术振兴机构;

关键词：

D O I：

10.1109/77.403297

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Short metallic weak links of Nb are used for millimeter-wave mixer experiments at 100-110 GHz. When the weak links are connected to a voltage bias circuit with zero output impedance, subharmonic gap structures are observed as a large dynamic resistance region or a negative differential resistance region at voltages V-n=2 Delta/ne on the I-V curve, where n=1,2,3... These strong structures are caused by a resonance effect between the energy gap and the multiple Andreev reflections that are present whenever there is a spatial inhomogeneity of the pair potential. Enhancement of IF signal peaks is observed at the subgap voltages. These experimental results suggest the appearance of the density of states predicted theoretically by R. Kummel et al. The subharmonic gap structure and details of the SNS mixer experiment will be described.

引用

页码：3300 / 3303

页数：4

共 17 条

[1] SUPERCONDUCTING TUNNELING WITHOUT THE TUNNELING HAMILTONIAN .2. SUBGAP HARMONIC STRUCTURE [J].