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Ambi-chiral anomalous Hall effect in magnetically doped topological insulators

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Science China(Physics,Mechanics & Astronomy) 2022年第6期65卷 116-122页

作者： Chang Liu YunYi Zang Yan Gong Ke He XuCun Ma qikun xue YaYu Wang State Key Laboratory of Low Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Beijing Academy of Quantum Information Sciences Beijing 100193China Frontier Science Center for Quantum Information Beijing 100084China

The chirality associated with broken time-reversal symmetry in magnetically doped topological insulators has important implications for the quantum transport *** we report anomalous Hall effect studies in Mn-and Cr-doped Bi_(2)Te_(3) topological insulators with varied thicknesses and doping *** tracing the magnitude of the anomalous Hall resistivity,we find that the Mn-type anomalous Hall effect characterized with clockwise chirality is strengthened by the reduction of film thickness,which is opposite to that of the Cr-type anomalous Hall effect with counterclockwise *** provide a phenomenological physical picture to explain the evolution of the magnetic order and the anomalous Hall chirality in magnetically doped topological insulators.

关键词： topological insulator anomalous Hall effect chirality magnetic order

原位重构限制在三维纳米孔铜内的铋纳米颗粒促电还原CO_(2)

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Science China Materials 2024年第3期67卷 796-803页

作者：赵秋玉王静庄严宫磊张薇宁樊唯镏鲁振张永政藤田武志张平薛其坤 School of Physics and Physical Engineering Qufu Normal UniversityQufu 273165China School of Chemistry and Chemical Engineering Shandong UniversityJinan 25010China Institute of Physics Chinese Academy of SciencesBeijing 100190China Advanced Institute for Materials Research Tohoku UniversitySendai 980-8577Japan School of Environmental Science and Engineering Kochi University of TechnologyKami 782-8502Japan

由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,... 详细信息

由于单金属Bi在CO_(2)还原反应(CO_(2)RR)中效率较低,通过表面工程复合材料提高电导率和产率是一种有吸引力的方法.在此,我们重构了在三维纳米孔铜结构中的原位生长金属Bi纳米颗粒.得益于三维纳米多孔导电网络和Cu与Bi之间的强相互作用,Bi@np-Cu费米能级向上移动,表现出优异的电催化二氧化碳还原性能.Bi@np-Cu在-0.97 V的电位下具有97.7%的甲酸法拉第效率,电流密度为82 mA cm^(-2).重要的是,该催化剂在连续催化反应40 h后仍能实现超过90%的法拉第效率.DFT计算表明,np-Cu有效地调节了Bi的电子态,优化了中间吸附能,从而提高了Bi的本征活性.这项工作为纳米多孔金属在催化中的应用提供了一个新视角.

关键词： 3D nanoporous CO_(2)RR Bi nanoparticle electrocatalysis reconstruction

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Gate voltage control of helicity-dependent photocurrent and polarization detection in(Bi_(1-x)Sb_(x))_(2)Te_(3)topological insulator thin films

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Photonics Research 2023年第11期11卷 1902-1911页

作者： SHENZHONG CHEN JINLING YU XIYU HONG KEJING ZHU YONGHAI CHEN SHUYING CHENG YUNFENG LAI KE HE qikun xue Institute of Micro/Nano Devices and Solar Cells School of Physics and Information EngineeringFuzhou UniversityFuzhou 350108China State Key Laboratory of Low-Dimensional Quantum Physics Department of PhysicsTsinghua UniversityBeijing 100084China Key Laboratory of Semiconductor Materials Science Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China

Optical helicity provides us with an effective means to control the helicity-dependent photocurrent in the spinmomentum-locked surface states of topological insulators(TIs).Also,the TIs show potential in polarization detection as an intrinsic solid-state optical chirality detector for easier integration and ***,the complex photoresponses with the circular photogalvanic effect,the linear photogalvanic effect,and the photon drag effect in the TIs prevent them from direct chirality detection of the elliptically polarized ***,by fitting with the theoretical models to the measured photocurrents,the microscopic origin of different components of the helicity-dependent photocurrent has been *** show a comprehensive study of the helicitydependent photocurrent in(Bi_(1-x)Sb_(x))_(2)Te_(3)thin films of different thicknesses as a function of the light incident angle and the gate-tuned chemical *** observation of the light incident angle dependence of the helicitydependent photocurrent provides us with a polarization detection strategy using a TI thin film without the use of any additional optical elements,and the detection accuracy can be enhanced by gate ***,the Stokes parameters can be extracted by arithmetic operation of photocurrents measured with different incident angles and gating voltages for complete characterization of the polarization states of a light *** this means,we realize the polarization detection and the Stokes parameters analysis with a single *** work provides an alternative solution to develop miniaturized intrinsic polarization-sensitive photodetectors.

关键词： topological incident insulator

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陶瓷也能像金属一样塑性变形?

科学通报 2023年第2期68卷 140-141页

作者：薛其坤南方科技大学深圳518055 清华大学物理系北京100084

陶瓷是我国的重大发明,是中华文明的重要载体.先进陶瓷材料因具有耐高温、耐腐蚀、强度高、密度低等优异性能,被广泛用于航空航天、能源、医疗等领域.例如,在航空发动机领域,相对于金属发动机,陶瓷发动机具有重量轻、工作温度高、热机... 详细信息

陶瓷是我国的重大发明,是中华文明的重要载体.先进陶瓷材料因具有耐高温、耐腐蚀、强度高、密度低等优异性能,被广泛用于航空航天、能源、医疗等领域.例如,在航空发动机领域,相对于金属发动机,陶瓷发动机具有重量轻、工作温度高、热机转化效率高的特点,有望大幅提升发动机的性能,因此,陶瓷发动机是科学家几个世纪以来的梦想.

关键词：陶瓷发动机先进陶瓷材料航空航天转化效率航空发动机塑性变形耐腐蚀工作温度

认真学习贯彻党的二十大精神扎实推进新型研究型大学发展

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国家教育行政学院学报 2023年第2期302卷 3-6页

作者：薛其坤南方科技大学广东深圳518055

习近平总书记在党的二十大报告中指出,必须坚持科技是第一生产力、人才是第一资源、创新是第一动力,深入实施科教兴国战略、人才强国战略、创新驱动发展战略,开辟发展新领域新赛道,不断塑造发展新动能新优势。党的二十大报告第五部分以... 详细信息

习近平总书记在党的二十大报告中指出,必须坚持科技是第一生产力、人才是第一资源、创新是第一动力,深入实施科教兴国战略、人才强国战略、创新驱动发展战略,开辟发展新领域新赛道,不断塑造发展新动能新优势。党的二十大报告第五部分以“实施科教兴国战略,强化现代化建设人才支撑”为题,对教育、科技、人才进行了统筹安排和一体化部署。

关键词：现代化建设人才科教兴国战略研究型大学创新驱动发展战略科技是第一生产力人才强国战略统筹安排一体化

Nanoscale superconductivity of ?-Ga islands grown by molecular beam epitaxy

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Science China(Physics,Mechanics & Astronomy) 2015年第10期58卷 89-93页

作者： ZHANG HuiMin PENG JunPing GUAN JiaQi LI Zhi SONG CanLi WANG LiLi HE Ke MA XuCun xue qikun Institute of Physics Chinese Academy of Sciences State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Collaborative Innovation Center for Quantum Matter

We report on the preparation and superconductivity of metastable γ-Ga islands on Si(111) substrate. The Ga grows in a typical Volmer-Weber mode at a low temperature of 110 K, resulting in formation of Ga nanoislands at various sizes with the identical γ-phase. In-situ low temperature scanning tunneling spectra reveal quantized electronic states in ultrathin Ga islands. It is found that both the lateral size and thickness of the Ga islands strongly suppress the superconductivity. Due to substantial surface energy contribution, the transition temperature Tc scales inversely with the island thickness and the minimum thickness for the occurrence of superconductivity is calculated to be two monolayers.

关键词：分子束外延生长超导电性纳米级硅(111) 最小厚度扫描隧道谱横向尺寸亚稳态

In situ Raman spectroscopy of topological insulator Bi2Te3 films with varying thickness

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Nano Research 2013年第9期6卷 688-692页

作者： Chunxiao Wang Xiegang Zhu Louis Nilsson Jing Wen GuangWang Xinyan Shan Qing Zhang Shulin Zhang Jinfeng Jia qikun xue State Key Laboratory for Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China DepartmentofPhysics Peking University Beijing 100871 China Department of Physics andAstronomy and Interdisciplinary Nanoscience Center Aarhus University 8000 Aarhus C Denmark Department of Physics Shanghai Jiaotong University Shanghai200240 China

拓扑的绝缘体(TI ) 大批是有乐队差距的量物质的一个新状态，进行表面说。在这个工作，分子的横梁取向附生(MBE ) 准备的拓扑的绝缘体 Bi2Te3 电影的拉曼系列被测量了由一在里面 situ 超离频真空(UHV )-MBE-Raman 光谱学系统。Bi2Te3 ... 详细信息

拓扑的绝缘体(TI ) 大批是有乐队差距的量物质的一个新状态，进行表面说。在这个工作，分子的横梁取向附生(MBE ) 准备的拓扑的绝缘体 Bi2Te3 电影的拉曼系列被测量了由一在里面 situ 超离频真空(UHV )-MBE-Raman 光谱学系统。Bi2Te3 的厚度什么时候拍摄，减少从 40 五倍层(QL ) 到 1 QL，光谱大批出现的一些拉曼模式的特征 Bi2Te3 变化并且一个新震动的模式出现，它没在以前的研究被报导并且可能与量尺寸效果并且对称碎有关。另外，当一个迪拉克锥形成了时，一个明显的变化在 3 QL 被观察。这些结果在 TI 的新奇的量状态附近为一些提供新信息。

关键词：原位拉曼光谱 Bi2Te3 绝缘体薄膜拓扑厚度量子尺寸效应表面状态

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拓扑量子材料与量子反常霍尔效应

材料研究学报 2015年第3期29卷 161-177页

作者：何珂薛其坤清华大学物理系低维量子物理国家重点实验室北京100084

简要综述自从2005年前后发展起来的一类新的材料体系-"拓扑"量子材料,它包含拓扑绝缘体、拓扑晶体绝缘体、拓扑超导体和拓扑半金属等。这类材料中较强的自旋轨道耦合作用导致了包括量子反常霍尔效应在内的丰富多彩的量子现象,有可能对... 详细信息

简要综述自从2005年前后发展起来的一类新的材料体系-"拓扑"量子材料,它包含拓扑绝缘体、拓扑晶体绝缘体、拓扑超导体和拓扑半金属等。这类材料中较强的自旋轨道耦合作用导致了包括量子反常霍尔效应在内的丰富多彩的量子现象,有可能对未来低能耗电子学、拓扑量子计算和清洁能源等技术的发展具有重大的推动作用。

关键词：综述拓扑绝缘体量子霍尔效应量子反常霍尔效应

Observation of unconventional anomalous Hall effect in epitaxial CrTe thin films

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Nano Research 2018年第6期11卷 3116-3121页

作者： Dapeng Zhao Liguo Zhang Iftikhar Ahmed Malik Menghan Liao Wenqiang Cui Xinqiang Cai Cheng Zheng Luxin Li Xiaopeng Hu Ding Zhang Jinxing Zhang Xi Chen Wanjun Jiang qikun xue State Key Laboratory of Low Dimensional Quantum Physics Department of Physics Tsinghua University Beijing 100084 China Department of Physics Beijing Normal University Beijing 100875 China Collaborative Innovation Center of Quantum Matter Beijing 100084 China

We have studied the magnetic and electrical transport properties of epitaxial NiAs-type CrTe thin films grown on SrTiO3（111） substrates. Unlike rectangle hysteresis loops obtained from magnetic measurements, we have identified intriguing extra bump/dip features from anomalous Hall experiments on the films with thicknesses less than 12 nm. This observed Hall anomaly is phenomenologically consistent with the occurrence of a topological Hall effect （THE） in chiral magnets with a skyrmion phase. Furthermore, the THE contribution can be tuned by the film thickness, showing the key contribution of asymmetric interfaces in stabilizing N6el-type skyrmions. Our work demonstrates that a CrTe thin film on SrTiO3（111） substrates is a good material candidate for studying real-space topological transport.

关键词： topological Hall effect CrTe films skyrmion phase molecular beam epitaxy