SPATIALLY-RESOLVED STUDY OF THE DYNAMICS OF JOSEPHSON TUNNEL-JUNCTIONS

被引：28

作者：

LACHENMANN, SG ^{[1
]}

DODERER, T ^{[1
]}

HUEBENER, RP ^{[1
]}

QUENTER, D ^{[1
]}

NIEMEYER, J ^{[1
]}

POPEL, R ^{[1
]}

机构：

[1] PHYS TECH BUNDESANSTALT, W-3300 BRAUNSCHWEIG, GERMANY

来源：

PHYSICAL REVIEW B | 1993年 / 48卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.48.3295

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By scanning superconducting Nb/Al2O3/Nb tunnel junctions of various geometries with an electron beam at low temperatures we have obtained spatially resolved two-dimensional images related with the dynamics of the junctions. In a current-biased junction the local thermal perturbation effected by the beam results in a voltage change DELTAV representing a convenient imaging-response signal. The spatial resolution is limited by a characteristic thermal healing length with a value of about 2 mum in our experiments. We analyze our results in terms of the sine-Gordon equation. For the interpretation of the spatially resolved voltage signal DELTAV we extend the energetic analysis of the perturbed sine-Gordon system of McLaughlin and Scott by including the beam-induced local thermal perturbation. Our model allows the quantitative comparison of our experimental two-dimensional images with the local dynamics expected from the perturbed sine-Gordon equation. Our experiments include the observation of single-mode and multiple-mode cavity resonances, soliton oscillations, and flux-flow behavior.

引用

页码：3295 / 3303

页数：9

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