Subharmonic Shapiro steps and assisted tunneling in superconducting point contacts -: art. no. 157001

被引：44

作者：

Cuevas, JC

Heurich, J

Martín-Rodero, A

Yeyati, A

Schön, G

机构：

[1] Univ Karlsruhe, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[2] Univ Autonoma Madrid, Dept Fis Teor Mat Condensada C5, E-28049 Madrid, Spain

[3] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2002年 / 88卷 / 15期

关键词：

D O I：

10.1103/PhysRevLett.88.157001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We analyze the current in a superconducting point contact of arbitrary transmission in the presence of a microwave radiation. The interplay between the ac Josephson current and the microwave signal gives rise to Shapiro steps at voltages V = (m/n)(h) over bar omega(r)/2e , where n, m are integer numbers and omega(r) is the radiation frequency. The subharmonic steps (n not equal 1) are a consequence of multiple Andreev reflections (MAR) and provide a signature of the peculiar ac Josephson effect at high transmission. Moreover, the dc current exhibits a rich subgap structure due to photon-assisted MARs.

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页数：4

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