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spin-polarized quantum transport through an Aharonov-Bohm quantum-dot-ring

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Chinese Physics B 2007年第7期16卷 2075-2081页

作者：王建明王瑞梁九卿 Department of Physics and Institute of Theoretical Physics Shanxi University Taiyuan 030006 China

In this paper the quantum transport through an Aharonov-Bohm （AB） quantum-dot-ring with two dot-array arms described by a single-band tight-binding Hamiltonian is investigated in the presence of additional magnetic fields applied to the dot-array arms to produce spin flip of electrons. A far richer interference pattern than that in the charge transport alone is found. Besides the usual AB oscillation the tunable spin polarization of the current by the magnetic flux is a new observation and is seen to be particularly useful in technical applications. The spectrum of transmission probability is modulated by the quantum dot numbers on the up-arc and down-arc of the ring, which, however, does not affect the period of the AB oscillation.

关键词： spin-polarized Aharonov-Bohm ring interference

Short Range Magnetic Order From spin-polarized Photoelectron Diffraction and Holography: Experiment and Theory for MnO(001)

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电子显微学报 1997年第4期 71-72页

ＳｈｏｒｔＲａｎｇｅＭａｇｎｅｔｉｃＯｒｄｅｒＦｒｏｍＳｐｉｎＰｏｌａｒｉｚｅｄＰｈｏｔｏｅｌｅｃｔｒｏｎＤｉｆｒａｃｔｉｏｎａｎｄＨｏｌｏｇｒａｐｈｙ：ＥｘｐｅｒｉｍｅｎｔａｎｄＴｈｅｏｒｙｆｏｒＭｎＯ（００１）... 详细信息

ＳｈｏｒｔＲａｎｇｅＭａｇｎｅｔｉｃＯｒｄｅｒＦｒｏｍＳｐｉｎＰｏｌａｒｉｚｅｄＰｈｏｔｏｅｌｅｃｔｒｏｎＤｉｆｒａｃｔｉｏｎａｎｄＨｏｌｏｇｒａｐｈｙ：ＥｘｐｅｒｉｍｅｎｔａｎｄＴｈｅｏｒｙｆｏｒＭｎＯ（００１）Ｚ．Ｘ．Ｗａｎｇ（Ｌａｗｒｅｎｃｅ...

关键词： Theory Magnetic Order Photoelectron Diffraction MnO spin-polarized

Co and Phthalocyanine Overlayers on the Quantum-Well System Co(001)/Cu: spin-polarized Electron Reflection Experiments

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Journal of Modern Physics 2018年第5期9卷 976-984页

作者： Etienne Urbain Guillaume Garreau Patrick Wetzel Samy Boukari Eric Beaurepaire Martin Bowen Wolfgang Weber Université de Strasbourg CNRS Institut de Physique et Chimie des Matériaux de Strasbourg Strasbourg France Université de Haute-Alsace CNRS Institut de Science des Matériaux de Mulhouse Mulhouse France

The influence of a Co or phthalocyanine (Pc) molecular overlayer on the properties of quantum-well resonances (QWR) in Cu layers atop Co(001) is studied by means of spin-polarized electron reflection. For Co atoms and Pc molecules, an energy shift of the QWR-induced signal is observed with increasing coverage and is attributed to a variation of the electron reflection phase at the Cu/Co and Cu/Pc interface. For Co we find a linear energy shift in the Cu QWR energy position with increasing coverage down to the sub-monolayer regime. This shows that the phase accumulation model remains accurate within the sub-monolayer regime of a discontinuous interface. An opposite sign in the energy shift between Co and Pc overlayers could reflect an opposite impact on the Cu surface work function of overlayer adsorption.

关键词： Quantum-Well Resonances spin-polarized Electron Reflection

spin-dependent tunnelling through an indirect double-barrier structure

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Chinese Physics B 2008年第9期17卷 3438-3443页

作者：王瑞张存喜王建明梁九卿 Physical Department Zhejiang Ocean University Department of Physics and Institute of Theoretical Physics Shanxi University

We use the transfer matrix method to study the quantum tunnelling through an indirect-band-gap double-barrier like the GaAs/AlAs/GaAs/AlAs/GaAs heterostructures along the [001] axis, which is described by the tight-binding model. The X-valley quasi-bound state gives rise to the Fano resonance different from the direct double-barrier transition in a resonance-tunnelling diode. The quantitative calculations demonstrate that a relatively high spin-polarization of the transmission probability can be achieved as compared with the single-barrier tunnelling ease. Moreover the extension to the multi-barrier device is provided and leads to an important observation that the spin polarization increases with the number of barriers.

关键词： spin-polarized spin-orbit interaction indirect-barrier

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spin Transport under In-plane Electric Fields with Different Orientations in Undoped InGaAs/AlGaAs Multiple Quantum Wells

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Chinese Physics Letters 2019年第7期36卷 82-85页

作者： Xiao-di Xue Yu Liu Lai-pan Zhu Wei Huang Yang Zhang Xiao-lin Zeng Jing Wu Bo Xu Zhan-guo Wang Yong-hai Chen Wei-feng Zhang Henan Key Laboratory of Photovoltaic Materials Henan University Kaifeng 475004 Key Laboratory of Semiconductor Materials Science Institute of Semiconductors Chinese Academy of Sciences Beijing Key Laboratory of Low Dimensional Semiconductor Materials and Devices Beijing 100083 Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing 100049 Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of Sciences Beijing 100083 Science and Technology on Monolithic Integrated Circuits and Modules Laboratory Nanjing Electronic Devices Institute Nanjing 210016

The spin-polarized photocurrent is used to study the in-plane electric field dependent spin transport in undoped InGaAs/AlGaAs multiple quantum wells. In the temperature range of 77–297 K, the spin-polarized photocurrent shows an anisotropic spin transport under different oriented in-plane electric fields. We ascribe this characteristic to two dominant mechanisms: the hot phonon effect and the Rashba spin-orbit effect which is influenced by the in-plane electric fields with different orientations. The formulas are proposed to fit our experiments, suggesting a guide of potential applications and devices.

关键词： The spin-polarized photocurrent dependent spin transport applications and devices

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Magnetic vortex gyration mediated by point-contact position

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Chinese Physics B 2019年第10期28卷 531-534页

作者： Hua-Nan Li Zi-Wei Fan Jia-Xin Li Yue Hu Hui-Lian Liu College of Physics Jilin Normal University National Demonstration Center for Experimental Physics EducationJilin Normal University

Micromagnetic simulation is employed to study the gyration motion of magnetic vortices in distinct permalloy nanodisks driven by a spin-polarized current. The critical current density for magnetic vortex gyration, eigenfrequency, trajectory, velocity and the time for a magnetic vortex to obtain the steady gyration are analyzed. Simulation results reveal that the magnetic vortices in larger and thinner nanodisks can achieve a lower-frequency gyration at a lower current density in a shorter time. However, the magnetic vortices in thicker nanodisks need a higher current density and longer time to attain steady gyration but with a higher eigenfrequency. We also find that the point-contact position exerts different influences on these parameters in different nanodisks, which contributes to the control of the magnetic vortex gyration. The conclusions of this paper can serve as a theoretical basis for designing nano-oscillators and microwave frequency modulators.

关键词： magnetic vortex spin-polarized current point-contact micromagnetic simulation

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