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Evidence for distortion-induced local electric polarization in α-RuCl3

Science China(Physics,Mechanics & Astronomy) 2024年第9期Mechanics & Astronomy) .卷 169-177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 D.I.Khomskii Mingquan He zhigao sheng Young Sun College of Physics Center of Quantum Materials and DevicesChongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHefei Institutes of Physical ScienceAnhuiChinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum(JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of PhysicsFudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of Sciences Ⅱ.Physikalisches Institut Universit?t zu K?ln

The spin-orbit assisted Mott insulator α-RuCl3is 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 system. Here, we report distortion-induced local electric polarization in α-RuCl3as evidenced by single-crystal X-ray diffraction,second harmonic generation（SHG） and dielectric measurements. The SHG signal appears at room temperature and develops substantially in the Kitaev paramagnetic state when short-range spin correlations come into play. Despite 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 polarization. This localized electric polarization is likely the result of distortion-induced charge dimerization, achieved through virtual hopping-induced charge redistribution. In addition, the electric polarization is boosted by short-range spin correlations via spin-phonon coupling in the Kitaev paramagnetic state. Our results emphasize the importance of charge degrees of freedom in α-RuCl3, 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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Evidence for distortion-induced local electric polarization in α-RuCl

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Science China(Physics,Mechanics & Astronomy) 2024年

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 D.I.Khomskii Mingquan He zhigao sheng Young Sun College of Physics Center of Quantum Materials and Devices Chongqing University Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Hefei Institutes of Physical Science Anhui Chinese Academy of Sciences University of Science and Technology of China Jülich Centre for Neutron Scienceat Heinz Maier-Leibnitz Zentrum (JCNS-MLZ) Forschungszentrum Jülich GmbH School of Physics Beihang University Analytical and Testing Center Chongqing University State Key Laboratory of Surface Physics Department of Physics Fudan University CAS Key Laboratory of Theoretical Physics Institute of Theoretical Physics Chinese Academy of Sciences II.Physikalisches Institut Universit?t zu K?ln

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Planar-symmetry-breaking induced antisymmetric magnetoresistance in van der Waals ferromagnet Fe_(3)GeTe_(2)

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Nano Research 2022年第3期15卷 2531-2536页

作者： Ping Liu Caixing Liu Zhi Wang Meng Huang Guojing Hu Junxiang Xiang Chao Feng Chen Chen Zongwei Ma Xudong Cui Hualing Zeng zhigao sheng Yalin Lu Gen Yin Gong Chen Kai Liu Bin Xiang Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science&EngineeringCAS Key Lab of Materials for Energy ConversionUniversity of Science and Technology of ChinaHefei 230026China School of Science Nanjing University of Posts and TelecommunicationsNanjing 210023China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryChinese Academy of SciencesHefei 230031China Sichuan New Materials Research Center Institute of Chemical MaterialsCAEPChengdu 610200China Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of ChinaHefei 230026China Physics Department Georgetown UniversityWashingtonDC 20057USA

Recently discovered magnetic van der Waals(vdW)materials provide an ideal platform to explore low-dimensional magnetism and spin *** vdW interaction nature opens up unprecedented opportunities to build vertically stacked heterostructures with novel properties and *** engineering the planar structure as an alternative degree of freedom,herein we demonstrate an antisymmetric magnetoresistance(MR)in a vdW Fe_(3)GeTe_(2)flake with a step terrace that breaks the planar *** antisymmetric MR originates from a sign change of the anomalous Hall effect and the continuity of the current transport near the boundary of magnetic domains at the step edge.A repeatable domain wall due to the unsynchronized magnetization switching is responsible for this sign *** interpretation is supported by the observation of field-dependent domain switching,and the step thickness,temperature,and magnetic field orientation dependent *** work opens up new opportunities to encode magnetic information by controlling the planar domain structures in vdW magnets.

关键词： 2D magnetism Fe_(3)GeTe_(2) planar structure engineering antisymmetric magnetoresistance

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Optical spectroscopy study of Ca_3(Ru_(0.91)Mn_(0.09))_2O_7 single crystal in high magnetic fields

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Science Bulletin 2019年第1期64卷 20-25页

作者： Xueli Xu Jin Peng Junpei Zhang Zongwei Ma Cheng Chen Junbo Han Bingjie Liu Lingfang Lin Xiaoshan Wu Zhiqiang Mao Zhe Qu zhigao sheng Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences University of Science and Technology of China Collaborative Innovation Center of Advanced Microstructures Nanjing University School of Physics Southeast University Wuhan National High Magnetic Field Center Huazhong University of Science and Technology School of Physics Nanjing University Department of Physics and Engineering Physics Tulane University

The magneto-optical spectrum, with magnetic fields up to 42 T, of double layered ruthenates Ca_3(Ru_(0.91)Mn_(0.09))_2O_7(CRMO) single crystal is studied. Both the temperature and magnetic field induced insulator-to-metal transitions(IMTs) are observed via magneto-optical properties of the crystal. The critical magnetic field(H//c) of IMT for CRMO is found to be as large as 35 T at 5 K. The fine structure of optical spectra identified the antiferromagnetic/ferro-orbital-ordering configurations of Ru 4d orbitals at low temperatures. Meanwhile, the configuration of orbital polarization of such double-layer CRMO single crystal is discussed. These results suggest that the orbital degree of freedom plays an important role in the field induced IMT of multi-orbital system.

关键词： Ruthenates High magnetic field Optical spectroscopy Insulator to metal transition

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Transient Photoconductivity in LaRhO3 Thin Film

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Chinese Physics Letters 2019年第11期36卷 70-73页

作者：孟智沈磊马宗伟 Muhammad Adnan Aslam 徐立强许学莉朱旺成龙卞跃成皮雳周春盛志高 Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences University of Science and Technology of China

High-quality epitaxial LaRhO3(LRO) thin films on SrTiO3(110) single-crystalline substrates are fabricated by pulsed laser deposition and their photoconductivity properties are studied. The transient photoconductivity(TPC) effect is found in this semiconductor LRO film at room temperature. The magnitude of TPC increases almost linearly with the laser power intensities and the photon energies in visible light range. Moreover, the difference in the TPC results under two airflow conditions confirms that both intrinsic photoinduced carrier accumulation and extrinsic photoinduced heating effects contribute to the magnitude of TPC effect.

关键词： temperature. conductivity transient

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Magnetic anisotropy manipulation and interfacial coupling in Sm_(3)Fe_(5)O_(12)films and CoFe/Sm_(3)Fe_(5)O_(12)heterostructures

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Chinese Physics B 2021年第12期30卷 583-590页

作者：沈磊武冠杰孙韬孟智周春刘文怡邱康马宗伟黄浩亮陆亚林张宗芝盛志高 Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field LaboratoryHFIPSChinese Academy of Sciences(CAS)4Hefei 230031China University of Science and Technology of China Hefei 230026China Shanghai Ultra-Precision Optical Manufacturing Engineering Research Center and Key Laboratory of Micro and Nano Photonic Structures(MOE) Department of Optical Science and EngineeringFudan UniversityShanghai 200433China Anhui Laboratory of Advanced Photon Science and Technology Hefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Key Laboratory of Photovoltaic and Energy Conservation Materials Chinese Academy of SciencesHefei 230031China

The magnetic anisotropy manipulation in the Sm_(3)Fe_(5)O_(12)(SmIG)films and its effect on the interfacial spin coupling in the CoFe/SmIG heterostructures were studied *** switching the orientation of the Gd_(3)Ga_(5)O_(12)substrates from(111)to(001),the magnetic anisotropy of obtained SmIG films shifts from in-plane to *** results can also be obtained in the films on Gd_(3)Ga_(5)O_(12)substrates,which identifies the universality of such orientation-induced magnetic anisotropy ***,the interfacial spin coupling and magnetic anisotropy switching effect on the spin wave in CoFe/SmIG magnetic heterojunctions have also been explored by utilizing the time-resolved magneto-optical Kerr effect *** is intriguing to find that both the frequency and effective damping factor of spin precession in CoFe/SmIG heterojunctions can be manipulated by the magnetic anisotropy switching of SmIG *** findings not only provide a route for the perpendicular magnetic anisotropy acquisition but also give a further path for spin manipulation in magnetic films and heterojunctions.

关键词： perpendicular magnetic anisotropy Sm_(3)Fe_5O_(12)films interfacial spin coupling CoFe/Sm_(3)Fe_5O_(12)heterojunction

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基于长短时记忆网络和轻梯度增强机的风电功率多步预测

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湖南电力 2023年第6期43卷 68-75页

作者：李振海李钰炎易志高苏盛大唐华银(湖南)新能源有限公司湖南长沙422000 智能电网运行与控制湖南省重点实验室湖南长沙410114 长沙理工大学湖南长沙410114

风力发电预测在电力系统规划和决策中具有重要意义。然而,由于气象事件的随机性,准确预测风力功率一直是一个具有挑战性的难题。针对此,提出一种基于长短时记忆网络(long short term memory,LSTM)-轻梯度增强机(light gradient boosting... 详细信息

风力发电预测在电力系统规划和决策中具有重要意义。然而,由于气象事件的随机性,准确预测风力功率一直是一个具有挑战性的难题。针对此,提出一种基于长短时记忆网络(long short term memory,LSTM)-轻梯度增强机(light gradient boosting machine,LGBM)的预测模型,结合LSTM和LGBM的优势,以提高对未来风力功率的短期预测能力。LSTM模型捕捉风力功率的时序模式和趋势,并生成一个包含序列信息的隐藏状态,LGBM模型作为LSTM模型的补充,通过接收LSTM提取的隐藏状态作为输入,进一步预测未来的风力功率。实验结果表明,提出的LSTM-LGBM模型在全局训练时优于其他模型,证明了LSTM的时序特征提取能力及LGBM的预测性能。该模型的应用有助于提高风力发电预测的准确性,并为电力系统的运行和资源分配提供有效的支持。

关键词： LSTM LGBM 风电功率预测特征提取

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选择性催化还原单孔催化剂数值模拟

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热力发电 2016年第4期45卷 100-105页

作者：赵大周何胜司风琪徐治皋华电电力科学研究院浙江杭州310000 东南大学能源与环境学院江苏南京210096

考虑内外扩散以及副反应的影响,采用Fluent软件,建立了选择性催化还原（SCR）脱硝反应单孔催化剂三维模型,并以E-R反应动力学为基础,研究了运行参数和催化剂壁厚对脱硝效率和SO_2转化率的影响。结果表明：SCR脱硝反应工作温度区间较宽,... 详细信息

考虑内外扩散以及副反应的影响,采用Fluent软件,建立了选择性催化还原（SCR）脱硝反应单孔催化剂三维模型,并以E-R反应动力学为基础,研究了运行参数和催化剂壁厚对脱硝效率和SO_2转化率的影响。结果表明：SCR脱硝反应工作温度区间较宽,为553~653K;当温度超过653K,由于副反应的加剧,脱硝效率显著下降;在催化剂中沿烟气流向温度略有升高,但放热现象不明显;随着氨氮摩尔比的升高,脱硝效率逐渐升高,SO_2的转化率降低,氨逃逸增加;随着空速的增加,脱硝效率和SO_2的转化率均降低;SO_2转化率随催化剂壁厚的增加而线性增加,但由于内扩散的限制,脱硝效率随催化剂壁厚的增大而显著降低。

关键词：选择性催化还原烟气脱硝单孔催化剂催化剂壁厚 SO2转化率氨氮摩尔比脱硝效率

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β-胡萝卜素模拟体系超声降解机制研究

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食品与发酵工业 2020年第11期46卷 69-76页

作者：于奉生孙志高方明马亚琴盛冉西南大学柑桔研究所重庆400712 鲁南制药集团股份有限公司山东临沂276000

选取β-胡萝卜素代表类胡萝卜素,构建β-胡萝卜素水相模拟体系,考察超声作用下糖、酸、Vc等内源因子以及超声功率、超声温度等外源因子对其降解的影响。结果表明,超声过程中Vc和柠檬酸均能促进类胡萝卜素降解,且二者共存时具有增效作用... 详细信息

选取β-胡萝卜素代表类胡萝卜素,构建β-胡萝卜素水相模拟体系,考察超声作用下糖、酸、Vc等内源因子以及超声功率、超声温度等外源因子对其降解的影响。结果表明,超声过程中Vc和柠檬酸均能促进类胡萝卜素降解,且二者共存时具有增效作用,糖对类胡萝卜素有一定的保护作用,能不同程度地阻止Vc和酸对类胡萝卜素的破坏。分别建立不同超声温度和不同超声功率下β-胡萝卜素的降解动力学模型,发现只有30℃时符合零级动力学模型,其余条件下均符合一级动力学模型,但不同超声温度和超声功率下,降解率的变化分别是热效应和超声空化效应所致。采用高效液相色谱-二极管阵列检测器鉴定产生的β-胡萝卜素异构体,根据其Q值判断生成的3种异构体分别为15-顺式、13-顺式和9-顺式β-胡萝卜素;采用傅里叶红外光谱发现超声处理后的样品有C—O和C O的伸缩振动,初步推断其可能是胡萝卜素环氧化物、阿朴胡萝卜素醛或阿朴胡萝卜素酮;采用GC-MS分析其降解产生的挥发性产物,发现多种降异戊二烯化合物,主要为β-紫罗兰酮、异佛尔酮、2,2,6-三甲基环己酮等。

关键词：类胡萝卜素模拟体系超声处理降解机制降解产物

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不同方式提取的柑橘种子油中脂肪酸组成及活性成分分析

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食品科学 2016年第10期37卷 187-192页

作者：孙志高孙谦黄巧娟郝静梅盛冉西南大学柑桔研究所重庆400712 达川区农业局达川区农产品质量安全监督检测管理站四川达州635000

以红橘种子、长叶橙种子、梁平柚种子为实验原料,分别采用超临界CO2流体萃取、超声波辅助溶剂萃取、机械冷榨、机械热榨4种方法萃取得到12个油脂样品。经气相色谱-质谱测得12个油脂样品脂肪酸的主要成分为棕榈酸、硬脂酸、棕榈油酸、油... 详细信息

以红橘种子、长叶橙种子、梁平柚种子为实验原料,分别采用超临界CO2流体萃取、超声波辅助溶剂萃取、机械冷榨、机械热榨4种方法萃取得到12个油脂样品。经气相色谱-质谱测得12个油脂样品脂肪酸的主要成分为棕榈酸、硬脂酸、棕榈油酸、油酸和亚油酸,部分样品还含有功能性脂肪酸二高-γ-亚麻酸及角鲨烯,且萃取方式对脂肪酸组成影响呈显著水平。高效液相色谱法测定了油脂中柠檬苦素、诺米林和β-谷甾醇的含量,分别为0.05-0.99、0.13-0.98 mg/g和20.25-55.04μg/g,油脂萃取方式对柠檬苦素类物质的含量影响极显著,对β-谷甾醇的含量影响显著。

关键词：萃取方式柑橘品种脂肪酸组成活性物质

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