【大学频道】卡弗里理论科学研究所呈献 | 雷根斯堡大学Dieter Weiss教授

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图 | Dieter Weiss

题目：Spin injection/detection in two-dimensional electron systems

报告人：Dieter Weiss

单位：University of Regensburg, Germany

时间：2020-01-15

地点：中国科学院大学

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报告摘要

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.

个人简介

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.

会议简介

会议名称：The 2nd Kavli ITS Workshop on Magnetic Semiconductors

会议地点：中国科学院大学

会议时间：2020-01-15

主办方：中国科学院大学卡弗里理论科学研究所、中国科学院物理研究所