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Proximity effect in a ferromagnetic semiconductor with spin-orbit interactions

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Title: Proximity effect in a ferromagnetic semiconductor with spin-orbit interactions
Authors: Yamashita, Taketoki Browse this author
Lee, Jaechul Browse this author
Habe, Tetsuro Browse this author
Asano, Yasuhiro Browse this author →KAKEN DB
Issue Date: 3-Sep-2019
Publisher: American Physical Society (APS)
Journal Title: Physical Review B
Volume: 100
Issue: 9
Start Page: 094501
Publisher DOI: 10.1103/PhysRevB.100.094501
Abstract: We study theoretically the proximity effect in a ferromagnetic semiconductor with the Rashba spin-orbit interaction. The interplay between the exchange potential and the spin-orbit interactions enriches the symmetry variety of Cooper pairs depending on degree of disorder in a ferromagnet. In the ballistic limit, spin-singlet s-wave Cooper pairs are the most dominant in the presence of strong spin-orbit interaction because the spin-momentum locking stabilizes a Cooper pair consisting of two electrons of time-reversal partner to each other. We will show that the spin-orbit interactions generate equal-spin-triplet p-wave pairs. In the dirty regime, on the other hand, equal-spin-triplet s-wave pairs are dominant because random impurity potentials release the locking. The exchange splitting in the conduction band causes the imbalance between two equal-spin pairing components. In a half-metallic ferromagnet, only an equal-spin pairing component survives and carries the spin-polarized supercurrent. We discuss the effects of the spin-orbit interaction on the Josephson current.
Rights: ©2019 American Physical Society
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浅野 泰寛

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