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Negative tunnelling magnetoresistance in spin filtering magnetic junctions with spin-orbit coupling

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Chinese Physics B 2011年第5期20卷 367-372页

作者：李云 Department of Materials Science and Engineering Yunnan University Department of Chemistry KAIST373-1 Guseong-dongYuseong-guDaejeon 305-701Republic of Korea Department of Chemistry Seoul National UniversitySeoul 151-747Republic of Korea

We present theoretical calculations of spin transport in spin filtering magnetic tunnelling junctions based on the Landauer-Buttiker formalism and taking into account the spin-orbit coupling(SOC).It is shown that spin-flip scattering induced by SOC is stronger in parallel alignment of magnetization of the ferromegnet barrier(FB) and the ferromagnetic electrode than that in antiparallel *** increase of negative tunnelling magnetoresistance with bias is in agreement with recent experimental observation.

关键词： tunnelling magnetoresistance spin filtering barrier magnetic tunnelling junctions spin-orbit coupling

Entanglement beating in free space through spin–orbit coupling

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Light(Science & Applications) 2018年第1期7卷 1040-1046页

作者： Eileen Otte Carmelo Rosales-Guzmán Bienvenu Ndagano Cornelia Denz Andrew Forbes Institute of Applied Physics University of MuensterMuenster D-48149Germany School of Physics University of the WitwatersrandWits 2050South Africa

It is well known that the entanglement of a quantum state is invariant under local unitary *** rule dictates,for example,that the entanglement of internal degrees of freedom of a photon remains invariant during free-space ***,we outline a scenario in which this paradigm does not *** local Bell states engineered from classical vector vortex beams with non-separable degrees of freedom,the so-called classically entangled states,we demonstrate that the entanglement evolves during propagation,oscillating between maximally entangled(purely vector)and product states(purely scalar).We outline the spin–orbit interaction behind these novel propagation dynamics and confirm the results experimentally,demonstrating spin–orbit coupling in paraxial *** demonstration highlights a hitherto unnoticed property of classical entanglement and simultaneously offers a device for the on-demand delivery of vector states to targets,for example,for dynamic laser materials processing,switchable resolution within stimulated emission depletion(STED)systems,and a tractor beam for entanglement.

关键词： classical entanglement complex light fields entanglement oscillation spin-orbit coupling

Substrate dependent spin-orbit coupling in hybrid perovskite thin films

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Substrate dependent spin-orbit coupling in hybrid perovskite...

Absence of a transport signature of spin-orbit coupling in graphene with indium adatoms

第二届全国太阳能电池材料与器件大会

作者：张琦 Haomiao.Yu 北京交通大学 Key Laboratory of Luminescence and Optical Information Ministry of Education School of Science Beijing Jiaotong University

Solution processable hybrid metal halide perovskites pave the necessary condition for the development of flexible perovskite solar cells(PSCs)[1–3]. This paper reports the substrate effects on the spin-orbit coupling(SOC) in perovskite films through thermal expansion under thermal annealing. XRD measurements show that using flexible Polyethylene Naphthalate(PEN) substrate introduces a smaller mechanical strain in perovskite MAPbI3-xClx films, as compared to conventional glass substrate. Interestingly, our linear/circular photoexcitation modulated photocurrent studies found that decreasing mechanical strain gives rise to a weaker orbit-orbit interaction towards decreasing the SOC in the MAPbI3-xClx films prepared on flexible PEN substrate relative to rigid glass substrate. Simultaneously, decreasing the mechanical strain causes a reduction on the internal magnetic parameter inside the MAPbI3-xClx films, providing further evidence to show that introducing mechanical strain can affect the SOC in hybrid perovskite films upon using flexible substrate towards developing flexible perovskite thin film devices. Furthermore, our thermal admittance spectroscopy indicates that the trap states are increased in the perovskite films prepared on flexible PEN substrate as compared to glass substrate. Consequently, PEN and rigid glass substrates lead to shorter and longer photoluminescence lifetimes, respectively. Clearly, our findings provide an insightful understanding on substrate effects of optoelectronic properties in flexible perovskite thin film devices.

关键词： hybrid perovskites spin-orbit coupling substrates strain

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Absence of a transport signature of spin-orbit coupling in g...

Vortex-pair states in spin-orbit-coupled Bose-Einstein condensates with coherent coupling

中国真空学会2014学术年会

作者：贾振钊燕宝明牛晶晶韩琪朱瑞俞大鹏吴孝松人工微结构和介观物理国家重点实验室量子物质科学协同创新中心

Enhancement of the spin-orbit coupling in graphene may lead to various topological phenomena and also find applications in *** absorption has been proposed as an effective way to achieve the *** particular,great hope has been held for indium in strengthening the spin-orbit coupling and realizing the quantum spin Hall effect[1,2].To search for evidence of the spin-orbit coupling in graphene absorbed with indium adatoms,we carry out extensive transport measurements,i.e.,weak localization magnetoresistance,quantum Hall effect and non-local spin Hall *** signature of the spin-orbit coupling is *** explanations are discussed.

关键词： graphene spin-orbit coupling weak-localization quantum Hall effect spin Hall effect

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Frontiers of physics 2018年第5期13卷 295-301页

作者： Yong-Kai Liu Hong-Xia Yue Liang-Liang Xu Shi-Jie Yang College of Physics and Information Engineering Shanxi Normal University Linfen 041004 China Department of Physics Beijing Normal University Beijing 100875 China

Three types of vortex-pair are identified in two-component Bose-Einstein condensates （BEC） of dif- ferent kinds of spin-orbit coupling. One type holds the two vortices in one component of the two- component condensates. Both the other two types hold a vortex in each component of the two- component condensates, and exhibit meron-pair textures that have either null or unit topological charge, respectively. The cores of the two vortices are connected by a string of the relative phase jump. These vortex pairs can be generated from a vortex-free wave packet by incorporating different non- Abelian gauge field into the BEC. When a Rabi coupling is introduced, the distance between the two cores is effectively controlled by the Rabi coupling strength and a transition of vortex configurations is observed.

关键词： Bose-Einstein condensates spin-orbit coupling vortex-pair states

A two-field-scan harmonic Hall voltage analysis for fast,accurate quantification of spin-orbit torques in magnetic heterostructures

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 105-112页

作者： Xin Lin Lijun Zhu State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

We report on the development of a“two-field-scan”harmonic Hall voltage(HHV)analysis,which collects the second HHVas a function of a swept in-plane magnetic field at 45°and 0°relative to the excitation current,for the determination of the spin-orbit torques of transverse spins in magnetic heterostructures without significant perpendicular spins,longitudinal spins,and longitudinal/perpendicular Oersted *** demonstrate that this two-field-scan analysis is as accurate as the well-established but time-consuming angle-scan HHV analysis even in the presence of considerable thermoelectric effects but takes more than a factor of 7 less measurement *** also show that the fit of the HHV data from a single field scan at 0°,which is commonly employed in the literature,is not reliable because the employment of too many free parameters in the fitting of the very slowly varying HHV signal allows erroneous conclusion about the spin-orbit torque efficiencies.

关键词： spin-orbit torque spin current spin-orbit coupling spintronics

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Twisted Phosphors that Violate Kasha's Exciton Model in Organic Systems

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Chinese Journal of Chemistry 2024年第11期42卷 1237-1246页

作者： Boyi Fu Guangming Wang Jiuyang Li Junbo Li Xun Li Xiaoya Zhao Shuhui Ding Guoping Yan Qianqian Yan Kaka Zhang School of Materials Science and Engineering Wuhan Institute of TechnologyWuhanHubei430205 China Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules Shanghai Institute of Organic ChemistryUniversity of Chinese Academy of SciencesChinese Academy of Sciences345 Lingling RoadShanghai200032 China

Kasha's exciton model proposes that T1 energy levels of organic compounds are insensitive to molecular aggregation and microenvironment change because of negligible small transition dipole moments of T1 *** model holds true in most organic systems till *** we report the fabrication of twisted organic phosphors with intramolecular charge transfer characters and flexible molecular *** doped into different organic matrices,the twisted phosphor adopts different conformation,exhibits distinct phosphorescence colors and T1 energy levels,which violates Kasha's exciton model in organic *** that the change of phosphorescence colors and maxima can be readily distinguished by human eyes and conventional instrument,the twisted phosphors would be exploited as a new type of molecular probe,which would exhibit potential application in optical sensing and stimuli-responsive systems.

关键词： Afterglow Twisted phosphor Triplet excited state Room-temperature phosphorescence Luminescence spin-orbit coupling

Suppression of intervalley scattering and enhanced phonon anharmonic interactions in 2D Bi_(2)TeSe_(2):Crystal-field symmetry and band convergence

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Journal of Materiomics 2024年第2期10卷 386-395页

作者： Lei Peng Ao Wu Yujie Xia Haotian Zhang Yuting Yang Hezhu Shao Ying Chen Juan Zhang Le Shu Heyuan Zhu Yuxiang Zheng Hao Zhang School of Information Science and Technology Department of Optical Science and EngineeringFudan UniversityShanghai 200433China College of Electrical and Electronic Engineering Wenzhou UniversityWenzhou 325035China Department of Light Sources and Illuminating Engineering Fudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000China

The electron-phonon(el-ph)and phonon-phonon interactions play a key role in determining electronic and thermal transport properties,respectively,in promising two-dimensional(2D)semiconductor *** this study,we investigated el-ph interactions using Wannier-Fourier interpolation method and renormalized phonon scattering considering finite-temperature effects in Bi_(2)TeSe_(2)*** re-sults show that the optical phonon modes dominate the carrier scattering,where level repulsion induced by crystal field splitting and spin-orbit coupling(SOC)effect effectively suppresses intervalley scattering,leading to high hole ***,the strong anharmonicity in Bi_(2)TeSe_(2)monolayer results in the temperature-dependent softening of its optical phonons,along with a corresponding variation in interatomic force constants(IFCs).As a result,the lattice thermal conductivity is remarkably low and exhibits weak temperature ***,the predicted dimensionless thermoelectric figure of merit exceeds unity in the range of 200-800 K,indicating the potential of Bi_(2)TeSe_(2)monolayer for thermoelectric *** work provides new insights into the elimination of intervalley scat-tering by crystal field splitting and SOC effects,and paves the way for the evaluation of thermoelectric properties of materials with complex scattering mechanisms and strong anharmonicity.

关键词： El-ph interactions Crystal field splitting spin-orbit coupling Intervalley scattering Renormalized phonon scattering

Stable stripe and vortex solitons in two-dimensional spin-orbit coupled Bose-Einstein condensates

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Communications in Theoretical Physics 2024年第6期76卷 26-33页

作者： Yuan Guo Muhammad Idrees Ji Lin Hui-jun Li Institute of Nonlinear Physics and Department of Physics Zhejiang Normal UniversityJinhua 321004China Zhejiang Institute of Photoelectronics and Zhejiang Institute for Advanced Light Source Zhejiang Normal UniversityJinhua 321004China

We present a flexible manipulation and control of solitons via Bose-Einstein *** the presence of Rashba spin-orbit coupling and repulsive interactions within a harmonic potential,our investigation reveals the numerical local solutions within the *** manipulating the strength of repulsive interactions and adjusting spin-orbit coupling while maintaining a zero-frequency rotation,diverse soliton structures emerge within the *** include plane-wave solitons,two distinct types of stripe solitons,and odd petal solitons with both single and double *** stability of these solitons is intricately dependent on the varying strength of spin-orbit ***,stripe solitons can maintain a stable existence within regions characterized by enhanced spin-orbit coupling while petal solitons are unable to sustain a stable existence under similar *** rotational frequency is introduced to the system,solitons undergo a transition from stripe solitons to a vortex array characterized by a sustained *** rotational directions of clockwise and counterclockwise are non-equivalent owing to spin-orbit *** a result,the properties of vortex solitons exhibit significant variation and are capable of maintaining a stable existence in the presence of repulsive interactions.

关键词： Bose-Einstein condensate spin-orbit coupling rotation frequency stripe solitons vortex array

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