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圖 | Dieter Weiss
題 目:Spin injection/detection in two-dimensional electron systems
報告人:Dieter Weiss
單 位:University of Regensburg, Germany
時 間:2020-01-15
地 點:中國科學院大學
Ferromagnetic contacts of the diluted magnetic semiconductor (Ga, Mn) As turn out to be very effective spin injectors and detectors for (Al, Ga) As/GaAs based high mobility two-dimensional electron systems (2DES). As (Ga, Mn) As is a degenerately doped p-type semiconductor, epitaxially grown on n-type GaAs, the (Ga, Mn) As/GaAs interface forms an Esaki diode with high spin injection efficiency between 70% and 90%. The combination of epitaxial interface, high spin injection efficiency and non-recifying contacts enables two-terminal spin-valve experiments with large spin signals ΔR/R (ΔR= spin dependent resistance change, R = spin independent two-terminal resistance) of up to 80%. 2DES with (Ga, Mn) As injector/detector contacts are thus perfectly suited to seek for the Datta-Das spin transistor functionality. Besides first experiments, using gates to tune the spin signal I will report a significantly increased spin relaxation length in devices with reduced transport channel width.Dieter Weiss,since 1995 he is a full professor of physics in Regensburg. Besides having been Dean of the Physics Faculty and member of the Senate of the University of Regensburg for some time, he has been the spokesperson of DFG (German Science Foundation) funded research consortia (Research Unit FOR 370, Collaborative Research Center SFB689) on spintronics for more than 17 years. Today the focus of his research is on: the physics around spin injection, -detection and -manipulation in two-dimensional electron systems and spin-orbit fields in semiconductor-ferromagnet hybrid systems, transport and spin-transport in nanopatterned graphene, and transport in (nanopatterned) topological insulators, mostly HgTe based.
會議名稱:The 2nd Kavli ITS Workshop on Magnetic Semiconductors
會議地點:中國科學院大學
會議時間:2020-01-15
主辦方:中國科學院大學卡弗裡理論科學研究所、中國科學院物理研究所
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