Transport properties in an InAs-inserted-channel In0.52Al0.48As/In0.53Ga0.47As heterostructure coupled superconducting junction

Junsaku Nitta, Tatsushi Akazaki, Hideaki Takayanagi, Kunihiro Arai

Research output: Contribution to journalArticle

72 Citations (Scopus)

Abstract

Supercurrent is observed in a superconductor-semiconductor-superconductor (S-Sm-S) junction using a two-dimensional-electron-gas system in an InAs-inserted-channel In0.52Al0.48As/In0.53Ga0.47As heterostructure. The temperature dependence of the supercurrent cannot be explained by a simple exponential expression, but is here explained in terms of the clean-limit theory, taking account of the higher-order effect of the coherence length. The differential resistance of the junction shows clear subharmonic energy-gap structures due to multiple Andreev reflection since the phase coherence is maintained during the Andreev-reflection process. The Cooper pair transport explained by the clean-limit theory is attributed to the fact that the mean free path is longer than the coherence length and the length between the superconducting electrodes.

Original languageEnglish
Pages (from-to)14286-14289
Number of pages4
JournalPhysical Review B
Volume46
Issue number21
DOIs
Publication statusPublished - 1992 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics

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