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

研究成果: Conference contribution

抄録

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.

本文言語English
ホスト出版物のタイトルNOISE AND FLUCTUATIONS
ホスト出版物のサブタイトル18th International Conference on Noise and Fluctuations - ICNF 2005
ページ476-479
ページ数4
DOI
出版ステータスPublished - 2005 8月 25
外部発表はい
イベントNOISE AND FLUCTUATIONS: 18th International Conference on Noise and Fluctuations - ICNF 2005 - Salamanca, Spain
継続期間: 2005 9月 192005 9月 23

出版物シリーズ

名前AIP Conference Proceedings
780
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

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

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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