WHIRLING MODES AND PARAMETRIC-INSTABILITIES IN THE DISCRETE SINE-GORDON EQUATION - EXPERIMENTAL TESTS IN JOSEPHSON RINGS

被引：59

作者：

WATANABE, S ^{[1
]}

STROGATZ, SH ^{[1
]}

VANDERZANT, HSJ ^{[1
]}

ORLANDO, TP ^{[1
]}

机构：

[1] MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139

来源：

PHYSICAL REVIEW LETTERS | 1995年 / 74卷 / 03期

关键词：

D O I：

10.1103/PhysRevLett.74.379

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We analyze the damped driven discrete sine-Gordon equation. For underdamped, highly discrete systems, we show that whirling periodic solutions undergo parametric instabilities at certain drive strengths. The theory predicts novel resonant steps in the current-voltage characteristics of discrete Josephson rings, occurring in the return path of the subgap region. We have observed these steps experimentally in a ring of 8 underdamped junctions. An unusual prediction, verified experimentally, is that such steps occur even if there are no vortices in the ring. Numerical simulations indicate that complex spatiotemporal behavior occurs past the onset of instability. © 1995 The American Physical Society.

引用

页码：379 / 382

页数：4

共 22 条

[1] THE DYNAMICS OF COUPLED CURRENT-BIASED JOSEPHSON JUNCTIONS - PART II [J].