Shot noise induced by nonequilibrium spin accumulation

Tomonori Arakawa, Junichi Shiogai, Mariusz Ciorga, Martin Utz, Dieter Schuh, Makoto Kohda, Junsaku Nitta, Dominique Bougeard, Dieter Weiss, Teruo Ono, Kensuke Kobayashi

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

When an electric current passes across a potential barrier, the partition process of electrons at the barrier gives rise to the shot noise, reflecting the discrete nature of the electric charge. Here we report the observation of excess shot noise connected with a spin current which is induced by a nonequilibrium spin accumulation in an all-semiconductor lateral spin-valve device. We find that this excess shot noise is proportional to the spin current. Additionally, we determine quantitatively the spin-injection-induced electron temperature by measuring the current noise. Our experiments show that spin accumulation driven shot noise provides a novel means of investigating nonequilibrium spin transport.

Original languageEnglish
Article number016601
JournalPhysical review letters
Volume114
Issue number1
DOIs
Publication statusPublished - 2015 Jul 7

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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