Negative magnetoresistance in quantum-dot spin valve in cotunneling regime

Shogo Naya, Mikio Eto

研究成果: Conference contribution

抄録

The transport through a quantum-dot spin valve is theoretically examined when an electron spin 1/2 is localized in the quantum dot by the Coulomb blockade. The cotunneling current by the second-order tunnel processes is evaluated. We show that spin-flip cotunneling processes result in a negative magnetoresistance, which means that the conductance is larger in the antiparallel (AP) alignment of the magnetization in the ferromagnets than in the parallel (P) alignment, when double tunnel barriers are largely asymmetric. In the presence of Zeeman splitting in the quantum dot, the differential conductance can show a larger peak in the AP alignment when the bias voltage is matched to the splitting.

本文言語English
ホスト出版物のタイトルPhysics of Semiconductors - 30th International Conference on the Physics of Semiconductors, ICPS-30
ページ687-688
ページ数2
DOI
出版ステータスPublished - 2011
イベント30th International Conference on the Physics of Semiconductors, ICPS-30 - Seoul, Korea, Republic of
継続期間: 2010 7 252010 7 30

出版物シリーズ

名前AIP Conference Proceedings
1399
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Other

Other30th International Conference on the Physics of Semiconductors, ICPS-30
CountryKorea, Republic of
CitySeoul
Period10/7/2510/7/30

ASJC Scopus subject areas

  • Physics and Astronomy(all)

フィンガープリント 「Negative magnetoresistance in quantum-dot spin valve in cotunneling regime」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル