Observation of giant thermal noise due to multiple Andreev reflection in a ballistic SNS junction with an InGaAs-based heterostructure

T. Akazaki, H. Nakano, J. Nitta, H. Takayanagi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report on the fabrication of a ballistic SNS junction with a two-dimensional electron gas (2DEG) in an InGaAs-based heterostructure. We have observed the Josephson current as well as the subharmonic energy-gap structures caused by the MAR. Moreover, we experimentally estimated the thermal noise by comparing measured IV characteristics with those obtained with an extension of the Ambegaokar and Halperin theory. As a consequence, we have observed giant thermal noise that is much larger than that expected with normal reservoirs. The experimentally obtained "giant" thermal noise can be qualitatively explained by the Martín-Rodero theory that considers both the ballistic transport of the 2DEG and the thermal fluctuation in the coherent multiple Andreev reflection regime.

Original languageEnglish
Title of host publicationNOISE AND FLUCTUATIONS
Subtitle of host publication18th International Conference on Noise and Fluctuations - ICNF 2005
Pages476-479
Number of pages4
DOIs
Publication statusPublished - 2005 Aug 25
Externally publishedYes
EventNOISE AND FLUCTUATIONS: 18th International Conference on Noise and Fluctuations - ICNF 2005 - Salamanca, Spain
Duration: 2005 Sep 192005 Sep 23

Publication series

NameAIP Conference Proceedings
Volume780
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherNOISE AND FLUCTUATIONS: 18th International Conference on Noise and Fluctuations - ICNF 2005
CountrySpain
CitySalamanca
Period05/9/1905/9/23

Keywords

  • Multiple Andreev reflection
  • SNS junction
  • Thermal noise

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Fingerprint Dive into the research topics of 'Observation of giant thermal noise due to multiple Andreev reflection in a ballistic SNS junction with an InGaAs-based heterostructure'. Together they form a unique fingerprint.

  • Cite this

    Akazaki, T., Nakano, H., Nitta, J., & Takayanagi, H. (2005). Observation of giant thermal noise due to multiple Andreev reflection in a ballistic SNS junction with an InGaAs-based heterostructure. In NOISE AND FLUCTUATIONS: 18th International Conference on Noise and Fluctuations - ICNF 2005 (pp. 476-479). (AIP Conference Proceedings; Vol. 780). https://doi.org/10.1063/1.2036796