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Evidence for distortion-induced local electric polarization in α-RuCl_(3)

Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 165-173页

作者： Xinrun Mi De Hou Xiao Wang Sabreen Hammouda Caixing Liu Zijian Xiong Han Li Yan Liu Guiwen Wang Aifeng Wang Yisheng Chai Yang Qi Wei Li Xiaoyuan Zhou Yixi Su DIKhomskii Mingquan He Zhigao Sheng Young Sun College of Physics Center of Quantum Materials and DevicesChongqing UniversityChongqing 401331China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceAnhuiChinese Academy of SciencesHefei 230031 China University of Science and Technology of China Hefei 230026China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(JCNS-MLZ) Forschungszentrum Jülich GmbHGarching D-85747Germany School of Physics Beihang UniversityBeijing 100191China Analytical and Testing Center Chongqing UniversityChongqing 401331China State Key Laboratory of Surface Physics Department of PhysicsFudan UniversityShanghai 200433China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Ⅱ.Physikalisches Institut Universität zu KölnKöln D-50937Germany

The spin-orbit assisted Mott insulator α-RuCl_(3) is a prime candidate for material realization of the Kitaev quantum spin *** little attention has been paid to charge degrees of freedom,charge effects,such as electric polarization,may arise in this ***,we report distortion-induced local electric polarization in α-RuCl_(3) as evidenced by single-crystal X-ray diffraction,second harmonic generation(SHG)and dielectric *** SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into *** sizable pyroelectric currents in the Kitaev paramagnetic state,the absence of hysteresis in the polarization-electric field(P-E)points to the shortrange nature of electric *** localized electric polarization is likely the result of distortion-induced charge dimerization,achieved through virtual hopping-induced charge *** addition,the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic *** results emphasize the importance of charge degrees of freedom in α-RuCl_(3),which establish a novel platform to investigate charge effects in Kitaev materials.

关键词： Mott insulator Kitaev quantum spin liquid electric polarization

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Distinct moiré textures of in-plane electric polarizations for distinguishing moiré origins in homobilayers

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Science China(Physics,Mechanics & Astronomy) 2023年第10期66卷 121-130页

作者： Hongyi Yu Ziheng Zhou Wang Yao Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing School of Physics and AstronomySun Yat-sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-sen University(Guangzhou Campus)Guangzhou 510275China Department of Physics The University of Hong KongHong Kong 999077China HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong Hong Kong 999077China

In binary compound 2D insulators/semiconductors such as hexagonal boron nitride(h BN), the different electron affinities of atoms can give rise to out-of-plane electric polarizations across inversion asymmetric van der Waals interface of near 0° interlayer twisting. Here we show that at a general stacking order where sliding breaks 2π/3-rotational symmetry, the interfacial charge redistribution also leads to an in-plane electric polarization, with a magnitude comparable to that of the out-of-plane *** effect is demonstrated in h BN bilayers, as well as in biased graphene bilayers with gate-controlled interlayer charge redistributions. In long wavelength moiré patterns, the in-plane electric polarizations determined by the local interlayer stacking registries constitute topologically nontrivial spatial textures. We show that these textures can be used to distinguish moirépatterns of different origins from twisting, biaxial-and uniaxial-heterostrain, where vector fields of electric polarizations feature Bloch-type merons, Néel-type merons, and anti-merons, respectively. Combinations of twisting and heterostrain can further be exploited for engineering various electric polarization textures including 1D quasiperiodic lattices.

关键词： moirépatterns van der Waals stacking electric polarization hexagonal boron nitride graphene

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Electrostatic switch of magnetic core-shell in 0-3 type LSMO/PZT composite film

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Chinese Physics B 2020年第9期29卷 523-528页

作者： Bo Chen Zi-Run Li Chuan-Fu Huang Yong-Mei Zhang Department of Physics School of ScienceNorth University of ChinaTaiyuan 030051China School of Physics China University of Mining and TechnologyXuzhou 221116China

By dispersing La1-xSrxMnO3 (LSMO) granule into PbZrxTi1-xO3 (PZT) matrix, the 0-3 type LSMO/PZT composite film is synthesized through chemical solution method. The asymmetry of the top and bottom electrodes introduces novel electrostatic screening on LSMO/PZT interface. As electric polarization is switched between upward and downward orientations, the evolution of exchange bias, diode transport, and magnetoresistance is observed. The result implies the electrostatic switch of magnetic core-shell in the present film. In detail, as the spontaneous polarization is upward or downward in the PZT matrix, the ferromagnetic/antiferromagnetic or ferromagnetic/ferromagnetic core-shell structure is formed in LSMO granule, respectively. This work would develop a novel device for spintronics and metamaterial.

关键词： electric polarization magnetic core-shell exchange bias conductance

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electrical charge on ferroelectric nanocomposite membranes enhances SHED neural differentiation

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Bioactive Materials 2023年第2期20卷 81-92页

作者： Xiaochan Li Boon Chin Heng Yunyang Bai Qianqian Wang Min Gao Ying He Xinwen Zhang Xuliang Deng Xuehui Zhang Department of Geriatric Dentistry Peking University School and Hospital of StomatologyBeijing100081PR China Department of Dental Materials&Dental Medical Devices Testing Center Peking University School and Hospital of StomatologyBeijing100081PR China Department of Prosthodontics Peking University School and Hospital of StomatologyBeijing100081PR China Central Laboratory Peking University School and Hospital of StomatologyBeijing100081PR China Center of Implant Dentistry School and Hospital of StomatologyChina Medical UniversityLiaoning Provincial Key Laboratory of Oral DiseasesShenyang110002PR China National Engineering Research Center of Oral Biomaterials and Digital Medical Devices NMPA Key Laboratory for Dental MaterialsBeijing Laboratory of Biomedical MaterialsPeking University School and Hospital of StomatologyBeijing100081PR China

Stem cells from human exfoliated deciduous teeth(SHED)uniquely exhibit high proliferative and neurogenic *** biomaterials have been demonstrated to promote neural differentiation of stem cells,but the dose-response effect of electrical stimuli from these materials on neural differentiation of SHED remains to be ***,by utilizing different annealing temperatures prior to corona poling treatment,BaTiO_(3)/P(VDF-TrFE)ferroelectric nanocomposite membranes with varying charge polarization intensity(d_(33)≈0,4,12 and 19 pC N^(-1))were *** expression of neural markers,increased cell elongation and more prominent neurite outgrowths were observed with increasing surface charge of the nanocomposite membrane indicating a dose-response effect of surface electrical charge on SHED neural *** investigations of the underlying molecular mechanisms revealed that intracellular calcium influx,focal adhesion formation,FAK-ERK mechanosensing pathway and neurogenic-related ErbB signaling pathway were implicated in the enhancement of SHED neural differentiation by surface electrical ***,this study confirms the dose-response effect of biomaterial surface charge on SHED neural differentiation and provides preliminary insights into the molecular mechanisms and signaling pathways involved.

关键词： Surface charge electric polarization Dose-response effect electrical microenvironment Neurogenesis

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The twisted two-dimensional ferroelectrics

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Journal of Semiconductors 2023年第1期44卷 32-42页

作者： Xinhao Zhang Bo Peng National Engineering Research Center of Electromagnetic Radiation Control Materials School of Electronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 611731China Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education University of Electronic Science and Technology of ChinaChengdu 611731China

Since the beginning of research on two-dimensional(2D)materials,a few numbers of 2D ferroelectric materials have been predicted or experimentally confirmed,but 2D ferroelectrics as necessary functional materials are greatly important in developing future electronic *** breakthroughs in 2D ferroelectric materials are impressive,and the physical and structural properties of twisted 2D ferroelectrics,a new type of ferroelectric structure by rotating alternating monolayers to form an angle with each other,have attracted widespread interest and ***,we review the latest research on twisted 2D ferroelectrics,including Bernal-stacked bilayer graphene/BN,bilayer boron nitride,and transition metal ***,we prospect the development of twisted 2D ferroelectrics and discuss the challenges and future of 2D ferroelectric materials.

关键词： magic angle multiferroic ferromagnetic electric polarization long-range

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Fractal characteristics of electric properties of coal

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Journal of Coal Science & Engineering(China) 2006年第1期12卷 52-55页

作者：刘成伦徐龙君鲜学福 Department of Applied Chemistry Chongqing University Chongqing 400044 China Key Laboratory for the Exploitation of South-West Resources and Environmental Disaster Control Engineering of Ministry of Education Chongqing University Chongqing 400044 China Key Laboratory for the Exploitation of South-West Resources and Environmental Disaster Control Engineering of Ministry of Education Chongqing University Chongqing 400044 China

In the light of fractal geometry theory, the characteristics of coal's electric parameters (including dielectric constant, alternating conductivity, dielectric loss angle tangent and electric polarization constant) were studied by using literature data. The results are shown that the electrical properties of coal have fractal characteristic. The fractal dimensions of dielectric, alternating conductivity, dielectric loss angle tangent were obtained, and are relative to the content of pyrite sulfur, heat and ash content of coal.

关键词： coal fractal dimension dielectric constant alternating conductivity electric polarization dielectric loss angle tangent time-fractal

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Dielectric and ferroelectric properties of CoCr_(2)O_(4)nanoceramics

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Journal of Advanced Dielectrics 2019年第3期9卷 1-7页

作者： Pankaj Choudhar P.Saxena A.Yadav V.N.Rai A.Mishra Materials Science Laboratory School of Physics Vigyan BhawanDevi Ahilya University Khandwa Road CampusIndore 452001India Department of Physics Medi-Caps University PigdamberIndore 453331India

CoCr_(2)O_(4)nanoceramics are prepared by sol-gel auto combustion *** X-ray diffraction analysis affirms the singlephasepristine cubic structure with space group ***-Scherrer method estimates the crystallite size of main intense peak tobe~27:15 *** bands obtained in infrared spectra at 448 and 599 cm^(-1)are due to metal-oxygen stretching bond presentat tetrahedral and octahedral *** parameters decrease as frequency increases from 103 to 106 Hz that can be interpretedby Maxwell-Wagner-type interfacial *** impedance spectra(Nyquist plot)reveal arc like behavior,which ismainly due to intergrain(grain boundary)resistance that also exhibits conducting nature of the *** ferroelectricityis mainly associated with the partial reversal of the *** current behavior follows the Ohmic and Child square *** conduction process was interpreted by space-charge limited current(SCLC)*** current behaviorobserved in cobalt chromite nanoceramics is mainly attributed to the oxygen vacancies.

关键词： CoCr_(2)O_(4)nanoceramics synchrotron X-ray diffraction dielectric spectroscopy electric polarization leakage currentbehavior

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