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时间反演对称性破缺的笼目超导输运现象

物理学报 2024年第15期73卷 1-4页

作者：杨硕颖殷嘉鑫南方科技大学物理系深圳518055

近期对钒基笼目超导体(AV_(3)Sb_(5),A=K,Cs,Rb)家族中三种材料的低温量子输运测量均显示出时间反演对称性破缺的超导态.其中,在Nb/K_(1–x)V_(3)Sb/Nb的约瑟夫森结和RbV_(3)Sb_(5)中,超导转变温度以下的磁阻随磁场扫动方向存在磁滞现象... 详细信息

近期对钒基笼目超导体(AV_(3)Sb_(5),A=K,Cs,Rb)家族中三种材料的低温量子输运测量均显示出时间反演对称性破缺的超导态.其中,在Nb/K_(1–x)V_(3)Sb/Nb的约瑟夫森结和RbV_(3)Sb_(5)中,超导转变温度以下的磁阻随磁场扫动方向存在磁滞现象;C_(s)V_(3)Sb_(5)中存在零磁场下的超导二极管现象,即正向和反向的超导临界电流大小不同.首先,本文讨论了这些实验现象的区别和联系.然后,讨论产生上述非常规超导输运现象的可能机理,如手性超导序参量(d+id或p+ip),以及由电荷密度波与常规超导态耦合产生的手性配对密度波.

关键词：笼目超导体对称性破缺超导二极管

超导能隙振荡: 到底来自配对密度波还是拆对散射?

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物理学报 2024年第15期73卷 5-7页

作者：殷嘉鑫王强华南方科技大学物理系深圳518055 南京大学物理学院固体微结构物理国家重点实验室南京210093

早在1965年,于渌先生发表在《物理学报》的经典理论工作就指出:超导能隙在磁性杂质周围会产生微弱的周期性振荡.近十年来,一系列高分辨率的扫描隧道显微实验观测到超导体内能隙在空间中的微弱振荡行为并指认为配对密度波.据此情况,李东... 详细信息

早在1965年,于渌先生发表在《物理学报》的经典理论工作就指出:超导能隙在磁性杂质周围会产生微弱的周期性振荡.近十年来,一系列高分辨率的扫描隧道显微实验观测到超导体内能隙在空间中的微弱振荡行为并指认为配对密度波.据此情况,李东海等理论学者近期指出,在多种情况下,杂质拆对散射构成的干涉效应也会导致能隙在空间形成周期性振荡.我们讨论这两种观点的对立与统一,以及它们和实验的联系.

关键词：超导配对密度波扫描隧道显微镜

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笼目晶体中探索未知量子态

物理 2023年第3期52卷 157-165页

作者：殷嘉鑫南方科技大学物理系深圳518055

笼目起源于古老中华民俗文化。近期学者们对具有笼目晶格的一系列拓扑材料的研究揭示了量子层次上几何、拓扑、自旋和关联的交缠相互作用,以及随之涌现的丰富多彩的量子现象。文章简要介绍了笼目晶格的相关理论概念、陈数和外尔磁性、... 详细信息

笼目起源于古老中华民俗文化。近期学者们对具有笼目晶格的一系列拓扑材料的研究揭示了量子层次上几何、拓扑、自旋和关联的交缠相互作用,以及随之涌现的丰富多彩的量子现象。文章简要介绍了笼目晶格的相关理论概念、陈数和外尔磁性、平带关联现象,以及非常规电荷序和超导电性中的谜团。当前,国际上诸多研究机构使用各式手段对笼目磁体和超导体的研究盛况犹如正在举行一场笼目量子派对。然而,这些初步研究还无法突破超导和量子霍尔两大类宏观量子现象。希望此文能激励更多年轻学者在笼目晶体丰富的演生现象中进一步探寻第三类宏观量子现象,迎来真正的量子盛宴。

关键词：第三类宏观量子态笼目材料笼目磁体笼目超导

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笼目超导的量子退相干（英文）

Science Bulletin 2023年第6期 568-570页

作者：殷嘉鑫 Department of Physics Southern University of Science and Technology Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area(Guangdong)

关键词：

Theory for Charge Density Wave and Orbital-Flux State in Antiferromagnetic Kagome Metal FeGe

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Chinese Physics Letters 2024年第4期41卷 90-104页

作者：马海洋殷嘉鑫 M.Zahid Hasan 刘健鹏 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China ShanghaiTech Laboratory for Topological Physics ShanghaiTech UniversityShanghai 201210China Quantum Science Center of Guangdong-HongKong-Macao Greater Bay Area Shenzhen 518045China Laboratory for Topological Quantum Matter and Advanced Spectroscopy(B7) Department of PhysicsPrinceton UniversityPrincetonNew Jersey 08544USA Princeton Institute for Science and Technology of Materials Princeton UniversityPrincetonNew Jersey 08544USA Materials Sciences Division Lawrence Berkeley National LaboratoryBerkeleyCalifornia 94720USA Liaoning Academy of Materials Shenyang 110167China

We theoretically study the charge order and orbital magnetic properties of a new type of antiferromagnetic kagome metal *** on first-principles density functional theory calculations,we study the electronic structures,Fermi-surface quantum fluctuations,as well as phonon properties of the antiferromagnetic kagome metal *** is found that charge density wave emerges in such a system due to a subtle cooperation between electron-electron interactions and electron–phonon couplings,which gives rise to an unusual scenario of interaction-triggered phonon instabilities,and eventually yields a charge density wave(CDW)*** further show that,in the CDW phase,the ground-state current density distribution exhibits an intriguing star-of-David pattern,leading to flux density *** orbital fluxes(or current loops)in this system emerge as a result of the subtle interplay between magnetism,lattice geometries,charge order,and spin-orbit coupling(SOC),which can be described by a simple,yet universal,tight-binding theory including a Kane-Mele-type SOC term and a magnetic exchange *** further study the origin of the peculiar step-edge states in FeGe,which sheds light on the topological properties and correlation effects in this new type of kagome antiferromagnetic material.

关键词： interaction phonon orbital

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封面故事

物理 2023年第3期 156-156页

作者：阎萧宇殷嘉鑫南方科技大学物理系

笼目是一种由顶点互连的三角形构成的特殊几何图案。它最早出现于我国战国时期的竹编结构，并在东方民俗文化和西方宗教文化中都有出现。上千年来，笼目古老、简单和神秘的几何结构一直驱使着人类对它的探索和创作。近期，国内外的物理...

笼目是一种由顶点互连的三角形构成的特殊几何图案。它最早出现于我国战国时期的竹编结构，并在东方民俗文化和西方宗教文化中都有出现。上千年来，笼目古老、简单和神秘的几何结构一直驱使着人类对它的探索和创作。近期，国内外的物理学家逐渐对一大类具有笼目晶格的拓扑材料产生了浓厚的研究兴趣。

关键词：

Growth of High-Quality Superconducting FeSe0.5Te0.5 Thin Films Suitable for Angle-Resolved Photoemission Spectroscopy Measurements via Pulsed Laser Deposition

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Chinese Physics Letters 2015年第8期32卷 144-147页

作者：孔万东刘治国吴尚飞王刚钱天殷嘉鑫夏芮岩颜雷丁洪 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 Collaborative Innovation Center of Quantum Matter Beijing 100871

High-quality superconducting FeSe0.5 Te0.5 films are epitaxiMly grown on different substrates by using the pulsed laser deposition method. By measuring the transport properties and surface morphology of films grown on single- crystal substrates of Al2O3 （0001）, SrTiO3 （001）, and MgO （001）, as well as monitoring the real-time growth process on MgO substrates with reflection high energy electron diffraction, we find the appropriate parameters for epitaxial growth of high-quality FeSe0.5 Te0.5 thin films suitable for angle-resolved photoemission spectroscopy measurements. We further report the angle-resolved photoemission spectroscopy characterization of the super- conducting films. The clearly resolved Fermi surfaces and the band structure suggest a sample quality that is as good as that of high-quality single-crystals, demonstrating that the pulsed laser deposition method can serve as a promising technique for in situ preparation and manipulation of iron-based superconducting thin films, which may bring new prosperity to angle-resolved photoemission spectroscopy research on iron-based superconductors.

关键词： Thin Films Suitable for Angle-Resolved Photoemission Spectroscopy Measurements via Pulsed Laser Deposition Te Growth of High-Quality Superconducting FeSe ARPES MgO

Tip-Pressure-Induced Incoherent Energy Gap in CaFe_2As_2

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Chinese Physics Letters 2016年第6期33卷 125-127页

作者：殷嘉鑫王霁辉吴诤李昂梁学锦毛寒青陈根富吕兵朱经武丁洪潘庶亨 Institute of Physics Chinese Academy of Sciences Department of Physics and Texas Center for Superconductivity University of Houston Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Collaborative Innovation Center of Quantum Matter

In CaFe2 As2, superconductivity can be achieved by applying a modest c-axis pressure of several kbar. Here we use scanning tunneling microscopy/spectroscopy （STM/S） to explore the STM tip pressure effect on single crystals of CaFe2 As2. When performing STM/S measurements, the tip-sample interaction can be controlled to act repulsive with reduction of the junction resistance, thus to apply a tip pressure on the sample. We find that an incoherent energy gap emerges at the Fermi level in the differential conductance spectrum when the tip pressure is increased. This energy gap is of the similar order of magnitude as the superconducting gap in the chemical doped compound Cao.4Nao.6Fe2As2 and disappears at the temperature well below that of the bulk magnetic ordering. Moreover, we also observe the rhombic distortion of the As lattice, which agrees with the orthorhombic distortion of the underlying Fe lattice. These findings suggest that the STM tip pressure can induce the local Cooper pairing in the orthorhombic phase of CaFe2As2.

关键词： As Ca Tip-Pressure-Induced Incoherent Energy Gap in CaFe2As2 of Fe in

量子自旋霍尔绝缘体Bi_(4)Br_(4)体与边缘的可区分的光学性质研究

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Science Bulletin 2023年第4期68卷 417-423,M0004页

作者：韩俊峰毛鹏程陈海龙殷嘉鑫王茂原陈东云李永恺郑靖川张旭马大帅马琼余智明周金健刘铖铖王业亮贾爽翁羽翔 M.Zahid Hasan 肖文德姚裕贵 Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education)School of PhysicsBeijing Institute of TechnologyBeijing 100081China Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing 314000China Beijing Key Laboratory of Nanophotonics&Ultrafine Optoelectronic Systems Beijing Institute of TechnologyBeijing 100081China Analysis&Testing Center Beijing Institute of TechnologyBeijing 100081China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Laboratory for Topological Quantum Matter and Advanced Spectroscopy(B7) Department of PhysicsPrinceton UniversityPrinceton NJ 08544USA Department of Physics Xiamen UniversityXiamen 361005China Department of Physics Boston CollegeChestnut Hill MA 02467USA School of Integrated Circuits and Electronics MIIT Key Laboratory for Low-Dimensional Quantum Structure and DevicesBeijing Institute of TechnologyBeijing 100081China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Department of Physics Chongqing UniversityChongqing 400044China

量子自旋霍尔绝缘体拥有具有带隙的体态和无能隙的一维拓扑边缘态.然而,由于拓扑边缘态局域在纳米尺度,所以很难用光学手段直接观测并区分体态和边缘态,这就限制了对拓扑边缘态独特的光学特性和光电响应等方面的研究和应用.Bi_(4)Br_(4... 详细信息

量子自旋霍尔绝缘体拥有具有带隙的体态和无能隙的一维拓扑边缘态.然而,由于拓扑边缘态局域在纳米尺度,所以很难用光学手段直接观测并区分体态和边缘态,这就限制了对拓扑边缘态独特的光学特性和光电响应等方面的研究和应用.Bi_(4)Br_(4)体材料的台阶存在一维非平庸的边缘态,多个台阶累加的效应使得通过较为宏观的光学和光电分析手段来研究一维边缘态成为可能.该工作利用中远红外显微吸收光谱和泵浦探测光谱,对比研究了Bi_(4)Br_(4)体和边缘的光学响应行为.研究发现Bi_(4)Br_(4)的边缘在小于带隙(约0.22 eV)的波段存在明显的强于体内的红外吸收,且该吸收呈现较强的各向异性.室温下的红外泵浦探测首次观察到边缘处载流子激发态超长的弛豫时间(1.5 ns),该激发态载流子寿命要比体内载流子寿命长两个量级.该工作证实体态和拓扑边缘态具有明显不同的光学和光电响应行为,为未来设计新型红外探测器提供了材料和物理基础.

关键词： Topological insulator Quantum spin Hall effect Bi_(4)Br_(4) Edge states Mid-infrared absorption microspectroscopy Pump-probe micro-spectroscopy