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spin-polarized current in double quantum dots

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Chinese Physics B 2012年第11期21卷 383-387页

作者：李爱仙段素青 Graduate School of China Academy of Engineering Physics Institute of Applied Physics and Computational Mathematics

We analyze the transport through asymmetric double quantum dots with an inhomogeneous Zeeman splitting in the presence of crossed dc and ac magnetic fields. A strong spin-polarized current can be obtained by changing the dc magnetic field. It is mainly due to the resonant tunnelling. But for the ferromagnetic right electrode, the electron spin resonance also plays an important role in transport. We show that the double quantum dots with three-level mixing under crossed dc and ac magnetic fields can act not only as a bipolar spin filter but also as a spin inverter under suitable conditions.

关键词： resonant tunnelling spin-polarized current spin filter double quantum dots

Investigation of the magnetoresistance in EuS/Nb:SrTiO3 junction

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Chinese Physics B 2020年第11期29卷 492-496页

作者： Jia Lu Yu-Lin Gan Yun-Lin Lei Lei Yan Hong Ding Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences(CAS)Beijing 100190China College of Physics and Materials Science Tianjin Normal UniversityTianjin 300387China Department of Physics University of Chinese Academy of SciencesBeijing 100049China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China

EuS is one of typical ferromagnetic semiconductor using as spin filter in spintronic devices,and the doped one could be a good spin ***,we fabricate a spin-functional tunnel junction by epitaxially growing the ferromagnetic EuS film on Nb-doped *** improvement of Curie temperature up to 35 K is associated with indirect exchange through additional charge carriers at the interface of EuS/Nb:STO *** magnetic field controlled current-voltage curves indicate the large magnetoresistance(MR)effect in EuS barriers as a highly spin-polarized *** negative MR is up to 60%in 10-nm EuS/Nb:STO at 4 T and 30 *** MR is enhanced with increasing thickness of EuS *** large negative MR effect over a wide temperature range makes this junction into a potential candidate for spintronic devices.

关键词： EuS/Nb:SrTiO3 tunnel junction spin filter magnetoresistance

spin transport in a Zigzag normal/ferromagnetic graphene junction

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Chinese Physics B 2015年第5期24卷 514-518页

作者：史豪晟 Vahram L.Grigoryan Department of Physics and State Key Laboratory of Surface Physics Fudan University

We study magnetic proximity effect induced low-energy spin transport in the normal/ferromagnetic junction of a semi-infinite zigzag graphene nanoribbon. Due to the absence of a spin flip in a single interface, the spin transfer in this model can be described by the ＂two-spin channel＂ model. We identify each spin channel as either a perfect conducting or a non-conducting channel. This feature leads to spin filter in symmetric zigzag graphene nanoribbon and spin precession in antisymmetric zigzag graphene nanoribbon, and helps to directly determine the exchange-splitting intensity directly, even without an external auxiliary bias.

关键词： graphene junction spin filter spin transfer torque magnetic proximity effect

Magnetism in Carbon Nanoscrolls: Quasi-Half-Metals and Half-Metals in Pristine Hydrocarbons

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Nano Research 2009年第11期2卷 844-850页

作者： Lin Lai Jing Lu Lu Wang Guangfu Luo Jing Zhou Rui Qin Yu Chen Hong Li Zhengxiang Gao Guangping Li Wai Ning Mei Yutaka Maeda Takeshi Akasaka and Stefano Sanvito State Key Laboratory for Mesoscopic Physics and Department of Physics Peking UniversityBeijing 100871China Department of Physics University of Nebraska at OmahaOmahaNebraska 68182-0266USA SICAS Center Lee HallSUNY OneontaOneontaNY 13820USA Department of Chemistry Tokyo Gakugei UniversityTokyo 184-8501Japan PRESTO Japan Science and Technology Agency4-1-8 Honcho KawagushiSaitamaJapan Center for Tsukuba Advanced Research Alliance University of TsukubaIbaraki 305-8577Japan School of Physics and CRANN Trinity CollegeDublin 2Ireland

A magnetic ground state is revealed for the first time in zigzag-edged carbon nanoscrolls(ZCNSs)from spin-unrestricted density functional theory *** their flat counterpart-zigzag-edged carbon nanoribbons,which are semiconductors with spin-degenerate electronic structure-ZCNSs show a variety of magnetic configurations,namely spin-selective semiconductors,metals,semimetals,quasi-half-metals,and *** the best of our knowledge,this is the first discovery of quasi-half-metals and half-metals in a pure hydrocarbon without resort to an external electric *** addition,we calculated the spin-dependent transportation of the semiconducting ZCNSs with 12 and 20 zigzag chains,and found that they are 13% and 17% at the Fermi level,respectively,suggesting that ZCNS can be an effective spin filter.

关键词： Carbon nanoscrolls quasi-half-metals half-metals graphene spin-selective spin filter

spin manipulations through electrical and thermoelectrical transport in magnetic tunnel junctions

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Science China(Physics,Mechanics & Astronomy) 2013年第1期56卷 166-183页

作者： ZHU ZhenGang SU Gang School of Electronics Eletrical and Communication EngineeringUniversity of Chinese Academy of Sciences Institut fr Physik Martin-Luther-UniversittHalle-Wittenberg Nanotechnikum-WeinbergHeinrich-Damerow-Strasse 4 D-06120 Halle(Saale)Germany School of Physics University of Chinese Academy of Sciences

A brief review is presented,which includes the direct current,alternate current,electrical and thermoelectrical transport as well as spin transfer effect in a variety of spin-based nanostructures such as the magnetic tunnel junction(MTJ),ferromagnet(FM)-quantum dot(QD)/FM-FM,double barrier MTJ,FM-marginal Fermi liquid-FM,FM-unconventional superconductor-FM(FUSF),quantum ring and optical spin-field-effect *** magnetoresistances in those structures,spin accumulation effect in FM-QD-FM and FUSF systems,spin injection and spin filter into semiconductor,spin transfer effect,photon-assisted spin transport,magnonassisted tunneling,electron-electron interaction effect on spin transport,laser-controlled spin dynamics,and thermoelectrical spin transport are discussed.

关键词： spintronics magnetic tunnel junction spin transport magnetoresistance spin transfer torque spin injection spin filter spin-valve spin-orbit