Observation of enhanced thermal noise due to multiple Andreev reflection in ballistic InGaAs-based superconducting weak links

Tatsushi Akazaki, Hayato Nakano, Junsaku Nitta, Hideaki Takayanagi

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3 Citations (Scopus)

Abstract

We have experimentally obtained clear evidence of enhanced thermal noise in a ballistic superconductor-normal metal-superconductor junction with an InGaAs-based two-dimensional electron gas (2DEG). The thermal noise was estimated from a comparison of measured current-voltage characteristics with those obtained with an extended Ambegaokar and Halperin theory. As a consequence, we have observed enhanced thermal noise that is much larger than that expected with normal reservoirs. This enhanced thermal noise can be explained by a theory that considers both the ballistic transport of the 2DEG and the thermal fluctuation in the coherent multiple Andreev reflection regime.

Original languageEnglish
Article number132505
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number13
DOIs
Publication statusPublished - 2005 Mar 28

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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