10 research outputs found
Strong Spin-Orbit Interaction Induced in Graphene by Monolayer WS
We demonstrate strong anisotropic spin-orbit interaction (SOI) in graphene
induced by monolayer WS. Direct comparison between graphene/monolayer
WS and graphene/bulk WS system in magnetotransport measurements reveals
that monolayer transition metal dichalcogenide (TMD) can induce much stronger
SOI than bulk. Detailed theoretical analysis of the weak-antilocalization
curves gives an estimated spin-orbit energy () higher than 10 meV.
The symmetry of the induced SOI is also discussed, and the dominant
symmetric SOI can only explain the experimental results.
Spin relaxation by the Elliot-Yafet (EY) mechanism and anomalous resistance
increase with temperature close to the Dirac point indicates Kane-Mele (KM) SOI
induced in graphene.Comment: 5 pages, 4 figure
Novel transport phenomena in graphene induced by strong spin-orbit interaction
Graphene is known to have small intrinsic spin-orbit Interaction (SOI). In
this review, we demonstrate that SOIs in graphene can be strongly enhanced by
proximity effect when graphene is deposited on the top of transition metal
dichalcogenides. We discuss the symmetry of the induced SOIs and differences
between TMD underlayers in the capacity of inducing strong SOIs in graphene.
The strong SOIs contribute to bring novel phenomena to graphene, exemplified by
robust supercurrents sustained even under tesla-range magnetic fields.Comment: 14 pages, 7 figure
超伝導体中におけるスピン注入とスピン輸送
学位の種別: 課程博士審査委員会委員 : (主査)東京大学教授 大谷 義近, 東京大学教授 高木 英典, (独)日本原子力研究開発機構センター長 前川 禎通, フランス国立科学研究センター主任研究員 Helene Bouchiat, 東京大学教授 月橋 文孝University of Tokyo(東京大学
Generation of Large Spin Accumulation and Its Application to Superconductivity Modulation
報告番号: ; 学位授与年月日: 2012-03-22 ; 学位の種別: 修士 ; 学位の種類: 修士(科学) ; 学位記番号: 修創域第4152号 ; 研究科・専攻: 新領域創成科学研究科基盤科学研究系物質系専
Generation of Large Spin Accumulation and Its Application to Superconductivity Modulation
Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
Microwave photoassisted dissipation and supercurrent of a phase-biased graphene-superconductor ring
Irradiating normal-superconducting junctions with microwave photons produce spectacular effects, such as Shapiro steps and photoinduced modifications of the dc supercurrent. Moreover, microwave irradiation can also have other, hitherto unexplored consequences, such as a photoassisted dissipation which is phase dependent. Here we present a finite-frequency measurement of both the dissipation and the supercurrent of a phase-biased graphene-superconductor junction in response to microwave photons. We find that, while the supercurrent response is well described by existing theory, the dissipation exhibits unexpected effects which need new theoretical elucidation. Especially with high frequency photons, the dissipation is enhanced at phase zero, where it is minimum without irradiation. We attribute this enhancement to Andreev level transitions, made possible by microwave-induced nonequilibrium population of Andreev bound states. Our results demonstrate that dissipation is a more sensitive probe of microwave photons than is the supercurrent, and reveal the potential of measuring dissipation to improve superconducting photodetectors and investigate photoassisted physics in hybrid superconducting systems.peerReviewe