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ARPES investigation of the electronic structure and its evolution in magnetic topological insulator MnBi2+2nTe4+3n family

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National Science Review 2024年第2期11卷 81-93页

作者： Runzhe Xu Lixuan Xu Zhongkai Liu Lexian Yang Yulin Chen State Key laboratory of Low Dimensional Quantum physics Department of PhysicsTsinghua University School of Physical Science and technology Shanghai Tech University and CAS-Shanghai Science Research Center shanghai tech laboratory for topological physics Frontier Science Center for Quantum Information Collaborative Innovation Center of Quantum Matter Department of physics Clarendon LaboratoryUniversity of Oxford

In the past 5 years,there has been significant research interest in the intrinsic magnetic topological insulator family compounds MnBi2+2nTe4+3n（where n=0,1,2…）.In particular,exfoliated thin films of MnBi2Te4have led to numerous experimental breakthroughs,such as the quantum anomalous Hall effect,axion insulator phase and high-Chern number quantum Hall effect without Landau ***,despite extensive efforts,the energy gap of the topological surface states due to exchange magnetic coupling,which is a key feature of the characteristic band structure of the system,remains experimentally *** electronic structure measured by using angle-resolved photoemission （ARPES） shows significant deviation from ab initio prediction and scanning tunneling spectroscopy measurements,making it challenging to understand the transport results based on the electronic *** paper reviews the measurements of the band structure of MnBi2+2nTe4+3nmagnetic topological insulators using ARPES,focusing on the evolution of their electronic structures with temperature,surface and bulk doping and film *** aim of the review is to construct a unified picture of the electronic structure of MnBi2+2nTe4+3ncompounds and explore possible control of their topological properties.

关键词： magnetic topological insulator MnBi2Te4 electronic structure angle-resolved photoemission spectroscopy

Alternating twisted multilayer graphene:generic partition rules,double flat bands,and orbital magnetoelectric effect

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npj Computational Materials 2022年第1期8卷 1037-1044页

作者： Bo Xie Ran Peng Shihao Zhang Jianpeng Liu School of Physical Science and technology ShanghaiTech UniversityShanghai201210China shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai201210China

Recently the alternating twisted trilayer graphene is discovered to exhibit unconventional superconductivity,which motivates us to study the electronic structures and possible correlation effects for this class of alternating twisted multilayer graphene(ATMG)*** this work we consider generic ATMG systems with M-L-N stacking configurations,in which the M(L)graphene layers and the L(N)layers are twisted by an angleθ(−θ).Based on analysis from a simplified k⋅p model approach,we derive generic partition rules for the low-energy electronic structures,which exhibit various band dispersions including two pairs of flat bands and flat bands co-existing with various gapless Fermionic *** a mirror-symmetric ATMG system with doubled flat bands,we further find that Coulomb interactions may drive the system into a state with intertwined electric polarization and orbital magnetization orders,which can exhibit an interaction-driven orbital magnetoelectric effect.

关键词： twisted bands orbital

Visualization of ferromagnetic domains in vanadium-doped topological insulator thin films and heterostructures

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Tungsten 2023年第3期5卷 288-299页

作者： Ying-Jie Ma Ti-Rui Xia Wen-Bo Wang School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai 201210China

Magnetically doped topological insulator(TI) thin films and related heterostructures have been extensively studied for years due to their exotic quantum transport properties and potential applications in low-dissipation electronic devices and quantum *** selection of magnetic dopants is crucial to realize a high-quality magnetic TI with a robust ferromagnetic ordering and a preserved topological band *** this paper,we briefly review the recent magnetic domain imaging works in vanadium-doped magnetic topological insulator thin films and *** cryogenic magnetic force microscopy and in situ transport measurements,a ferromagnetic domain behavior has been demonstrated in V-doped Sb2Te3(ST) and Cr,V co-doped(Bi,Sb)2Te3(BST) thin *** direct visualization of long-range ferromagnetic ordering in a quantum anomalous Hall(QAH) system sheds light on enhancing the QAH temperature by improving the *** advantage of the different coercivity of Cr-and V-doped BST films,an axion insulating state has been observed in Cr-doped BST/BST/V-doped BST sandwich *** antiparallel magnetization alignment,which is the key ingredient for realization of axion insulating state,has been directly visualized via magnetic imaging at various magnetic *** V-doped ST/ST heterostructures also provide a platform for Berry phase engineering in momentum *** suppressing the anomalous Hall effect in such heterostructures,an intrinsic topological Hall effect can be revealed,which resolved the long-term puzzle of the origin of THE in the ultrathin ferromagnetic thin films and two-dimensional *** review of magnetic domain imaging in vanadium-doped topological insulators and heterostructures inspires further exploration of quantum transport properties in magnetic topological insulators and deepens the understanding of the interplay between the magnetic ordering and topological electronic band structures in magne

关键词： Vanadium-doped topological insulator Magnetic force microscopy Ferromagnetic domain Quantum anomalous Hall effect topological Hall effect

Effects of pressure and doping on Ruddlesden-Popper phases La_(n+1)Ni_(n)O_(3 n+1)

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Journal of Materials Science & technology 2024年第18期185卷 147-154页

作者： Mingxin Zhang Cuiying Pei Qi Wang Yi Zhao Changhua Li Weizheng Cao Shihao Zhu Juefei Wu Yanpeng Qi School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai 201210China shanghai Key laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China

Recently,the discovery of superconductivity with a critical temperature Tc up to 80 K in Ruddlesden-Popper phases La_(n+1)Ni_(n)O_(3 n+1)(n=2)under pressure has garnered considerable *** to now,the superconductivity was only observed in La_(3)Ni_(2)O_(7)single crystal grown with the optical-image float-ing zone furnace under oxygen *** remains to be understood the effect of chemical doping on superconducting La_(3)Ni_(2)O_(7)as well as other Ruddlesden-Popper ***,we systematically investi-gate the effect of external pressure and chemical doping on polycrystalline Ruddlesden-Popper *** results demonstrate that the application of pressure and doping effectively tunes the transport prop-erties of Ruddlesden-Popper *** find pressure-induced superconductivity up to 86 K in La_(3)Ni_(2)O_(7)polycrystalline sample,while no signatures of superconductivity are observed in La_(2)NiO_(4)and La_(4)Ni_(3)O_(10)polycrystalline samples under high pressure up to 50 *** study sheds light on the exploration of high-Tc superconductivity in nickelates.

关键词： Unconventional superconductivity High pressure Nickelates Ruddlesden-Popper phases

Spatial-and spin-resolution ARPES and magnetism beamline at SSRF

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Nuclear Science and techniques 2024年第8期35卷 23-37页

作者： Fang‑Yuan Zhu Jie‑Feng Cao Xiang‑Yu Meng Jun‑Qin Li Rui Yu Ya‑Mei Wang Shan Qiao Bo Zhao Ming‑Zhu Zhang Zhong‑Kai Liu Mei‑Xiao Wang Yong Wang Ren‑Zhong Tai shanghai Synchrotron Radiation Facility Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China shanghaitech laboratory for topological physics School of Physical Science and TechnologyShanghai Tech UniversityShanghai 201210China University of Chinese Academy of Sciences Beijing 100049China

The BL07U beamline is a new extreme ultraviolet and soft X-ray beamline housed in the shanghai Synchrotron Radiation Facility. Beamlines are used in nano-resolved angle-resolved photoemission spectroscopy(nano-ARPES), spin-resolved angle-resolved photoemission spectroscopy(spin-ARPES), X-ray magnetic circular dichroism spectroscopy, and X-ray magnetic linear dichroism spectroscopy for certain scientific research. The BL07U beamline, which is based on a pair of elliptical polarized undulators and a variable-included-angle plane-grating monochromator, delivers circularly or linear polarized X-rays within the energy range of 50–2000 eV. The beamline features two branches: One dedicated to nano-ARPES,which has a minimum spot size of only ~ 200 nm, and another branch comprising spin-ARPES, a vector magnetic field, and superconductive magnetic end-station.

关键词： Soft X-ray beamline Nano-ARPES Spin-ARPES XMCD/XMLD

Pressure-Induced Superconductivity in the Charge-Density-Wave Compound LaTe_(2-x)Sb_(x)(x=0 and 0.4)

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Chinese physics Letters 2023年第10期40卷 101-107页

作者：陈旭孙培函谢圳楷孟繁琦裴翠颖齐彦鹏应天平刘凯郭建刚陈小龙 Beijing National laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of physics and Beijing Key laboratory of Opto-electronic Functional Materials&Micro-nano Devices Renmin University of ChinaBeijing 100872China University of Chinese Academy of Sciences Beijing 100049China School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai 201210China shanghai Key laboratory of High-resolution Electron Microscopy and shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai 201210China

Magnetic CeTe_(2)achieving superconductivity under external pressure has received considerable *** intermingling of 4f and 5d electrons from Ce raised the speculation of an unconventional pairing mechanism arising from magnetic ***,we address this speculation using a nonmagnetic 4f-electron-free LaTe_(2)as an *** structural phase transition can be observed up to 35 GPa in the in situ synchrotron diffraction *** high-pressure electrical measurements show that LaTe_(2)exhibits superconductivity at20 Gpa with its T_(c)(4.5 K)being two times higher than its *** theoretical calculations reveal that charge transfer from the 4p orbitals of the planar square Te-Te network to the 5d orbitals of La is responsible for the emergence of superconductivity in LaTe_(2),as confirmed by Hall ***,we study the modulation of q_(CDW)by Sb substitution and find a record high T_(c)^(onset)~6.5 K in LaTe_(1.6)Sb_(0.4).Our work provides an informative clue to comprehend the role of 5d-4p hybridization in the relationship between charge density wave(CDW)and superconductivity in these RETe_(2)(RE=rare-earth elements)compounds.

关键词： superconductivity charge rare

Manipulating charge density wave state in kagome compound RbV_(3)Sb_(5)

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Chinese physics B 2023年第9期32卷 391-395页

作者：孟雨欣薛成龙窦立国赵伟民汪琪玮徐永杰刘祥麒夏威郭艳峰李绍春 National laboratory of Solid State Microstructures School of PhysicsNanjing UniversityNanjing 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China School of Physical Science and technology Shanghai Tech UniversityShanghai 201210China shanghai tech laboratory for topological physics Shanghai 201210China Jiangsu Provincial Key laboratory for Nanotechnology Nanjing UniversityNanjing 210093China Hefei National laboratory Hefei 230088China

Owing to the unique electronic structure,kagome materials AV_(3)Sb_(5)(A=K,Rb,Cs)provide a fertile platform of quantum phenomena such as the strongly correlated state and topological Dirac *** is well known that RbV_(3)Sb_(5)exhibits a 2×2 unconventional charge density wave(CDW)state at low temperature,and the mechanism is ***,by using scanning tunneling microscopy/spectroscopy(STM/STS),we successfully manipulated the CDW state in the Sb plane of RbV_(3)Sb_(5),and realized a new3(1/2)×3(1/2)modulation together with the ubiquitous 2×2 period in the CDW state of RbV_(3)Sb_(5).This work provides a new understanding of the collective quantum ground states in the kagome materials.

关键词： kagome material charge density wave scanning tunneling microscopy

Quantum Oscillations in Noncentrosymmetric Weyl Semimetal SmAlSi

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Chinese physics Letters 2022年第4期39卷 67-73页

作者： Weizheng Cao Yunlong Su Qi Wang Cuiying Pei Lingling Gao Yi Zhao Changhua Li Na Yu Jinghui Wang Zhongkai Liu Yulin Chen Gang Li Jun Li Yanpeng Qi School of Physical Science and technology ShanghaiTech UniversityShanghai 201210China shanghaitech laboratory for topological physics ShanghaiTech UniversityShanghai 201210China Department of physics Clarendon LaboratoryUniversity of OxfordParks RoadOxford OX13PUUK shanghai Key laboratory of High-resolution Electron Microscopy ShanghaiTech UniversityShanghai 201210China

As a new type of quantum state of matter hosting low energy relativistic quasiparticles,Weyl semimetals(WSMs)have attracted significant attention for scientific community and potential quantum device *** this study,we present a comprehensive investigation of the structural,magnetic,and transport properties of noncentrosymmetric RAl Si(R=Sm,Ce),which have been predicted to be new magnetic WSM *** samples exhibit nonsaturated magnetoresistance,with about 900%and 80%for Sm Al Si and Ce Al Si,respectively,at temperature of 1.8 K and magnetic field of 9 *** carrier densities of Sm Al Si and Ce Al Si exhibit remarkable change around magnetic transition temperatures,signifying that the electronic states are sensitive to the magnetic ordering of rare-earth *** low temperatures,Sm Al Si reveals prominent Shubnikov–de Haas oscillations associated with the nontrivial Berry ***-pressure experiments demonstrate that the magnetic order is robust and survival under high *** results would yield valuable insights into WSM physics and potentials in applications to next-generation spintronic devices in the RAl Si(R=Sm,Ce)family.

关键词： symmetric quantum nontrivial

Observation of Mott instability at the valence transition of f-electron system

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National Science Review 2023年第6期10卷 183-190页

作者： Haifeng Yang Jingjing Gao Yingying Cao Yuanji Xu Aiji Liang Xiang Xu Yujie Chen Shuai Liu Kui Huang Lixuan Xu Chengwei Wang Shengtao Cui Meixiao Wang Lexian Yang Xuan Luo Yuping Sun Yi-feng Yang Zhongkai Liu Yulin Chen School of Physical Science and technology Shanghai Tech University Key laboratory of Materials physics Institute of Solid State Physics Chinese Academy of Sciences Science Island Branch of Graduate School University of Science and Technology of China Beijing National laboratory for Condensed Matter physics and Institute of physics Chinese Academy of Sciences University of Chinese Academy of Sciences shanghai tech laboratory for topological physics State Key laboratory of Low Dimensional Quantum physics and Department of physics Tsinghua University State Key laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT) Chinese Academy of Sciences High Magnetic Field laboratory Chinese Academy of Sciences Collaborative Innovation Center of Microstructures Nanjing University Songshan Lake Materials laboratory Department of physics University of Oxford

Mott physics plays a critical role in materials with strong ele ctronic *** insulator-to-metal transition can be driven by chemical doping,external pressure,temperature and gate voltage,which is often seen in transition metal oxides with 3d electrons near the Fermi energy(*** superconductor).In4f-electron systems,however,the insulator-to-metal transition is mostly driven by Kondo hybridization and the Mott physics has rarely been explored in ***,by combining the angle-resolved photo emission spectroscopy and strongly correlated band structure calculations,we show that an unusual Mott instability exists in YbInCu4accompanying its mysterious first-order valence *** contrasts with the prevalent Kondo picture and demonstrates that YbInCu4is a unique platform to explore the Mott physics in Kondo lattice *** work provides important insight for the understanding and manipulation of correlated quantum phenomena in the f-electron system.

关键词： valence transition orbital-selectiveMott transition Kondo coupling heavy fermions strong correlations ARPES DMFT