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| 1 | Topological Nodal States in Circuit Lattice显示文摘Te search for artifcial structure with tunable topological properties is an interesting research direction of today’s topological physics.Here,we introduce a scheme to realize topological nodal states with a three-dimensional periodic inductor-capacitor(LC)circuit lattice,where the topological nodal line state and Weyl state can be achieved by tuning the parameters of inductors and capacitors.A tight-binding-like model is derived to analyze the topological properties of the LC circuit lattice.Te key characters of the topological states,such as the drumhead-like surface bands for nodal line state and the Fermi arc-like surface bands for Weyl state,are found in these systems.We also show that the Weyl points are stable with the fabrication errors of electric devices. | Kaifa Luo Rui Yu Hongming Weng | 2018 | Research2018，，1： | 4 |
| 2 | A new member of the topological semimetals family显示文摘In topological semimetals(TSMs),the quasi-particle excitations of electrons can be described by the Dirac or Weyl equation,mimicking the elusive massless Dirac or Weyl fermions in the low-frequency regime as emergent phenomena.The realization of elementary excitations,with and even | Hongming Weng Chen Fang Zhong Fang Xi Dai | 2017 | National Science Review2017，4，6： | 3 |
| 3 | Topological nodal line semimetals predicted from first-principles calculations显示文摘拓扑的半金属是量物质的最新发现的状态,它从绝缘体扩大了拓扑的状态的概念到金属并且在最近的年里吸引了大研究兴趣。一般来说,有三种拓扑的半金属,也就是迪拉克半金属, Weyl 半金属,和节的线半金属。节的线半金属能为另外的拓扑的状态被看作先锋状态。例如,从如此的节的线开始说,节的线结构可能演变为 Weyl 点,把点变换成迪拉克,或由介绍联合的纺纱轨道(SOC ) 或集体术语成为拓扑的绝缘体。在这篇评论论文,我们介绍显示出节的线半金属状态的理论材料,包括所有碳 Mackay-Terrones 水晶( MTC ), anti-perovskite Cu 3 PdN ,压的黑磷,和材料的帽子3家庭,并且我们在场为获得物质的如此的新奇状态的设计原则。 | Rui Yu Zhong Fang Xi Dai Hongming Weng | 2017 | Frontiers of physics2017，12，3： | 3 |
| 4 | Topological electronic states in HfRuP family superconductors显示文摘Based on the first-principles calculations and experimental measurements,we report that the hexagonal phase of ternary transition metal pnictides TT’X(T=Zr,Hf;T’=Ru;X=P,As),which are well-known noncentrosymmetric superconductors with relatively high transition temperatures,host nontrivial bulk topology.Before the superconducting phase transition,we find that HfRuP belongs to a Weyl semimetal phase with 12 pairs of type-II Weyl points,while ZrRuAs,ZrRuP and HfRuAs belong to a topological crystalline insulating phase with trivial Fu-Kane Z_(2) indices but nontrivial mirror Chern numbers.High-quality single crystal samples of the noncentrosymmetric superconductors with these two different topological states have been obtained and the superconductivity is verified experimentally.The wide-range band structures of ZrRuAs have been identified by ARPES and reproduced by theoretical calculations.Combined with intrinsic superconductivity,the nontrivial topology of the normal state may generate unconventional superconductivity in both bulk and surfaces.Our findings could largely inspire the experimental searching for possible topological superconductivity in these compounds. | Yuting Qian Simin Nie Changjiang Yi Lingyuan Kong Chen Fang Tian Qian Hong Ding Youguo Shi Zhijun Wang Hongming Weng Zhong Fang | 2019 | npj Computational Materials2019，，1： | 1 |
| 5 | Electronic structure and optical properties of the Co-dopedanatase TiO2 studied from first principles显示文摘 | Weng Hongming Yang Xiaoping Dong Jinming | 2004 | Phys Rev B2004，69，12： | 1 |
| 6 | High-pressure opens new windows for topological materials显示文摘Recently Guo et al.[1]have performed a systematic simulation on the high-pressure phases of the first experimentally available Weyl semimetals TaAs family.Through such a cheap but powerful technique,they theoretically found a | HongMing Weng | 2018 | Science China(Physics,Mechanics & Astronomy)2018，61，3： | 1 |
| 7 | Magnetic Weyl semimetal finally confirmed显示文摘Recently,a couple of Science papers[1,2]have reported the existence of Fermi arcs on the surface of a ferromagnetic compound,namely Co3Sn2S2,which was first proposed to be a magnetic Weyl semimetal(WSM)according to the giant anomalous Hall effect[3,4].The new evidence is in agreement with this proposal,suggesting that the magnetic WSM has been found after a nearly eight year research[5,6].This finding,along with the discovery of nonmagnetic WSMs of TaAs family in 2015[7,8],has completed the WSM classification.In comparison with the nonmagnetic WSM,magnetic WSM has a long-range magnetic order coupled with Weyl nodes.Furthermore,it offers more ways to control and explore the properties of WSMs. | HongMing Weng | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，12： | 1 |
| 8 | Multi-loop node line states in ternary MgSrSi-type crystals显示文摘Node line band-touchings protected by mirror symmetry(named as m-NLs),the product of inversion and time reversal symmetry S=PT(named as s-NLs),or nonsymmorphic symmetry are nontrivial topological objects of topological semimetals in the Brillouin Zone.In this work,we screened a family of MgSrSi-type crystals using first principles calculations,and discovered that more than 70 members are node-line semimetals.A new type of multi-loop structure was found in AsRhTi that a s-NL touches robustly with a m-NL at some“nexus point”,and in the meanwhile a second m-NL crosses with the s-NL to form a Hopf-link.Unlike the previously proposed Hopf-link formed by two s-NLs or two m-NLs,a Hopf-link formed by a s-NL and a m-NL requires a minimal three-band model to characterize its essential electronic structure.The associated topological surface states on different surfaces of AsRhTi crystal were also obtained.Even more complicated and exotic multi-loop structure of NLs were predicted in AsFeNb and PNiNb.Our work may shed light on search for exotic multi-loop node-line semimetals in real materials. | Jinling Lian Lixian Yu Qi-Feng Liang Jian Zhou Rui Yu Hongming Weng | 2019 | npj Computational Materials2019，，1： | 1 |
| 9 | Topological phases in pyrochlore thallium niobate Tl_(2)Nb_(2)O_(6+x)显示文摘The discovery of new topological electronic materials brings a chance to uncover new physics.Up to now,many materials have been theoretically proposed and experimentally proved to host different kinds of topological states.Unfortunately,there is little convincing experimental evidence for the existence of topological oxides.The reason is that oxidation of oxygen leads to ionic crystal in general and makes band inversion unlikely.In addition,the realization of different topological states in a single material is quite difficult,but strongly needed for exploring topological phase transitions. | Wei Zhang Kaifa Luo Zhendong Chen Ziming Zhu Rui Yu Chen Fang Hongming Weng | 2019 | npj Computational Materials2019，，1： | 0 |
| 10 | Evolution of Weyl nodes in Ni-doped thallium niobate pyrochlore Tl_(2-x)Ni_(x)Nb_(2)O_(7)显示文摘The magnetic Weyl semimetal(WSM)is important for fundamental physics and potential applications due to its spontaneous magnetism,robust band topology,and enhanced Berry curvature.It possesses many unique quantum effects,including a large intrinsic anomalous Hall effect,Fermi arcs,and chiral anomaly.In this work,using ab initio calculations,we propose that Nidoped pyrochlore Tl2Nb2O7is a magnetic WSM caused by the exchange field splitting on bands around its quadratic band crossing point.The exchange field tuned by Ni 3d on-site Coulomb interaction parameter U drives the evolution of Weyl nodes and the resulting topological phase transition.As Weyl nodes can exist at generic points in the Brillouin zone and are hard to identify exactly,their creation and annihilation,i.e.,the change in their number,chirality,and distribution,have been consistently confirmed with a combined theoretical approach,which employs parity criterion,symmetry indicator analysis,and the Wilson loop of the Wannier center.We find that Weyl nodes remain in a large range of U and are close to the Fermi level,which makes the experimental observation very possible.We think that this method and our proposal of magnetic WSM will be useful in finding more WSMs and add to the understanding of the topological phase transition. | Yuefang Hu Changming Yue Danwen Yuan Jiacheng Gao Zhigao Huang Zhong Fang Chen Fang Hongming Weng Wei Zhang | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，9： | 0 |
| 11 | Layer construction of topological crystalline insulator LaSbTe显示文摘Topological crystalline insulator(TCI)is one of the symmetry-protected topological states.Any TCI can be deformed into a simple product state of several decoupled two-dimensional(2 D)topologically nontrivial layers in its lattice respecting its crystalline symmetries called the layer construction(LC)limit.In this work,based on first-principles calculations we have revealed that both tetragonal LaSbTe(t-LaSbTe)and orthorhombic LaSbTe(o-LaSbTe)can be interpreted as stacking of 2 D topological insulators in each lattice space.The structural phase transition from t-LaSbTe to o-LaSbTe due to soft phonon modes demonstrates how the real space change can lead to the modification of topological states.Their symmetry-based indicators and topological invariants have been analyzed based on LC.We propose that LaSbTe is an ideal example demonstrating the LC paradigm,which bridges the crystal structures in real space to the band topology in momentum space. | YuTing Qian ZhiYun Tan Tan Zhang JiaCheng Gao ZhiJun Wang Zhong Fang Chen Fang HongMing Weng | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，10： | 0 |
| 12 | Predicting Dirac semimetals based on sodium ternary compounds显示文摘Predicting new Dirac semimetals,as well as other topological materials,is challenging since the relationship between crystal structure,atoms and band topology is complex and elusive.Here,we demonstrate an approach to design Dirac semimetals via exploring chemical degree of freedom.Based on understanding of the well-known Dirac semimetal,Na3Bi,three compounds in one family,namely Na_(2)MgSn,Na_(2)MgPb,and Na2CdSn,are located.Furthermore,hybrid-functional calculations with improved accuracy for estimation of band inversion show that Na_(2)MgPb and Na_(2)CdSn have the band topology of Dirac semimetals.The nontrivial surface states with Fermi arcs on the(100)and(010)surfaces are shown to connect the projection of bulk Dirac nodes.Most importantly,the candidate compounds are dynamically stable and have been experimentally synthesized.The ideas in this work could stimulate further predictions of topological materials based on understanding of existing ones. | Bo Peng Changming Yue Hao Zhang Zhong Fang Hongming Weng | 2018 | npj Computational Materials2018，，1： | 0 |
| 13 | Magnetic-field-induced electronic instability of Weyl-like fermions in compressed black phosphorus显示文摘Revealing the role of Coulomb interaction in topological semimetals with Dirac/Weyl-like band dispersion shapes a new frontier in condensed matter physics.Topological node-line semimetals(TNLSMs),anticipated as a fertile ground for exploring electronic correlation effects due to the anisotropy associated with their node-line structure,have recently attracted considerable attention.In this study,we report an experimental observation for correlation effects in TNLSMs realized by black phosphorus(BP)under hydrostatic pressure.By performing a combination of nuclear magnetic resonance measurements and band calculations on compressed BP,a magnetic-field-induced electronic instability of Weyl-like fermions is identified under an external magnetic field parallel to the so-called nodal ring in the reciprocal space.Anomalous spin fluctuations serving as the fingerprint of electronic instability are observed at low temperatures,and they are observed to maximize at approximately 1.0 GPa.This study presents compressed BP as a realistic material platform for exploring the rich physics in strongly coupled Weyl-like fermions. | Lixuan Zheng Kaifa Luo Zeliang Sun Dan Zhao Jian Li Dianwu Song Shunjiao Li Baolei Kang Linpeng Nie Min Shan Zhimian Wu Yanbing Zhou Xi Dai Hongming Weng Rui Yu Tao Wu Xianhui Chen | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，11： | 0 |
| 14 | Anisotropic magnetoelastic response in the magnetic Weyl semimetal Co_(3)Sn_(2)S_(2)显示文摘Co_(3)Sn_(2)S_(2) is a recently identified magnetic Weyl semimetal in Shandite compounds. Upon cooling, Co_(3)Sn_(2)S_(2) undergoes a ferromagnetic transition with c-axis polarized moments(0.3 μ_(B)/Co) around T_(C)= 175 K, followed by another magnetic anomaly around T_(A)≈ 140 K. A large intrinsic anomalous Hall effect is observed in the magnetic state below TC with a maximum of anomalous Hall angle near T_(A). Here, we report an elastic neutron scattering on the crystalline lattice of Co_(3)Sn_(2)S_(2) in a magnetic field up to 10 T. A strongly anisotropic magnetoelastic response is observed, while only a slight enhancement of the Bragg peaks is observed when B//c. The in-plane magnetic field(B//ab) dramatically suppresses the Bragg peak intensity probably by tilting the moments and lattice toward the external field direction. The in-plane magnetoelastic response commences from T_(C), and as it is further strengthened below T_(A), it becomes nonmonotonic against the field between T_(A) and T_(C) because of the competition from another in-plane magnetic order. These results suggest that a magnetic field can be employed to tune the Co_(3)Sn_(2)S_(2) lattice and its related topological states. | Chang Liu ChangJiang Yi XingYu Wang JianLei Shen Tao Xie Lin Yang Tom Fenne Uwe Stuhr ShiLiang Li HongMing Weng YouGuo Shi EnKe Liu HuiQian Luo | 2021 | Science China(Physics,Mechanics & Astronomy)2021，64，5： | 0 |
| 15 | Multiple Dirac points including potential spin-orbit Dirac points in nonsymmorphic HfGe0.92Te显示文摘The search for new materials with Dirac points has been a fascinating subject of condensed matter physics.Here we first report the growth and band structure of HfGe_(0.92)Te single crystals featuring three different types of Dirac points.HfGe_(0.92)Te crystallizes in a nonsymmorphic tetragonal space group P4/nmm(No.129),having a square Ge-atom plane with vacancies of about 8%.Using angle-resolved photoemission spectroscopy(ARPES),the Dirac nodal line composed of conventional Dirac points vulnerable to spin-orbit coupling(SOC)is observed,accompanied by robust Dirac points protected by the nonsymmorphic symmetry against SOC and vacancies.In particular,spin-orbit Dirac points(SDPs)originating from the surface formed under significant SOC could exist based on ARPES and calculations.Quasi-two-dimensional(quasi-2D)characteristics are confirmed by angular-resolved magnetoresistance.HfGe_(0.92)Te bulk crystals can be easily exfoliated to flakes with a thickness of approximately 5 nm for the quasi-2D nature.Thus,HfGe_(0.92)Te provides a good platform to explore exotic topological phases or topological properties with three different types of Dirac points,which is a potential candidate to achieve novel 2D SDPs. | Long Chen Liqin Zhou Ying Zhou Chen Liu Zhongnan Guo Ke Liao Shunye Gao Wenhui Fan Jinfeng Xu Yuxuan Guo Jia'ou Wang Tian Qian Hongming Weng Gang Wang | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，1： | 0 |
| 16 | Highly in-plane anisotropic optical properties of fullerene monolayers显示文摘Both the intrinsic anisotropic optical materials and fullerene-assembled 2D materials have attracted much interest in fundamental science and potential applications.The synthesis of a monolayer(ML)fullerene makes the combination of these two features plausible.In this work,using first-principles calculations,we systematically study the electronic structure and optical properties of quasi-hexagonal phase(qHP)ML and quasi-tetragonal phase(qTP)ML fullerenes.The calculations of q HP ML show that it is a semiconductor with small anisotropic optical absorption,which agrees with the recent experimental measurements.However,the results for qTP ML reveal that it is a semimetal with highly in-plane anisotropic absorption.The dichroic ratio,namely the absorption ratio of x-and y-polarized lightα_(xx)/α_(yy),is around 12 at photon energy of 0.29 eV.This anisotropy is much more pronounced when the photon energy is between 0.7 and 1.4 eV,whereα_(xx)becomes nearly zero whileα_(yy)is more than two orders of magnitude larger.This indicates qTP ML as a candidate for long-pursuit lossless metal and a potential material for atomically thin polarizer.We hope this will stimulate further experimental eforts in the study of qTP ML and other fullerene-assembled 2D materials. | Danwen Yuan Hanqi Pi Yi Jiang Yuefang Hu Liqin Zhou Yujin Jia Gang Su Zhong Fang Hongming Weng Xinguo Ren Wei Zhang | 2023 | Science China(Physics,Mechanics & Astronomy)2023，66，4： | 0 |
| 17 | Unprotected quadratic band crossing points and quantum anomalous Hall effect in FeB_(2) monolayer显示文摘Quadratic band crossing points(QBCPs)and quantum anomalous Hall effect(QAHE)have attracted the attention of both theoretical and experimental researchers in recent years.Based on first-principle calculations,we find that the FeB_(2) monolayer is a nonmagnetic semimetal with QBCPs at K.Through symmetry analysis and k·p invariant theory,we find that the QBCP is not protected by rotation symmetry and consists of two Dirac points with the same chirality(Berry phase of 2π).Once introducing Coulomb interactions,we find that there is a spontaneous-time-reversal-breaking instability of the spinful QBCPs,which gives rise to a C=2 QAH insulator with orbital moment ordering. | DongYu Wu YunPeng Huang Song Sun JiaCheng Gao ZhaoPeng Guo HongMing Weng Zhong Fang Kun Jiang ZhiJun Wang | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，5： | 0 |
| 18 | Extremely low-energy collective modes in a quasi-one-dimensional topological system显示文摘We have investigated the quasiparticle dynamics and collective excitations in the quasi-one-dimensional material ZrTe_(5) using ultrafast optical pump-probe spectroscopy.Our time-domain results reveal two coherent oscillations having extremely low energies of hω_(1)~0.33 me V(0.08 THz)and hω_(2)-1.9 me V(0.45 THz),which are softened as the temperature approaches two different critical temperatures(~54 K and~135 K).We attribute these two collective excitations to the amplitude mode of photoinduced dynamic charge density waves in ZrTe_(5) with tremendously small nesting wave vectors.Furthermore,a peculiar quasiparticle decay process associated with the hω_(2) mode with a timescale of~1-2 ps is found below the transition temperature T*(~135 K).Our findings provide pivotal information for studying the fluctuating order parameters and their associated quasiparticle dynamics in various low-dimensional topological systems and other materials. | Zhengxin Wei Shuai Zhang Yulun Su Liang Cheng Haidong Zhou Zhigang Jiang Hongming Weng Jingbo Qi | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，5： | 0 |
| 19 | Large Spin Hall Conductivity and Excellent Hydrogen Evolution Reaction Activity in Unconventional PtTe1.75 Monolayer显示文摘Two-dimensional(2D)materials have gained lots of attention due to the potential applications.In this work,we propose that based on first-principles calculations,the(2×2)patterned PtTe_(2)monolayer with kagome lattice formed by the well-ordered Te vacancy(PtTe_(1.75))hosts large and tunable spin Hall conductivity(SHC)and excellent hydrogen evolution reaction(HER)activity.The unconventional nature relies on the A1@1b band representation of the highest valence band without spin–orbit coupling(SOC).The large SHC comes from the Rashba SOC in the noncentrosymmetric structure induced by the Te vacancy.Even though it has a metallic SOC band structure,theℤ_(2)invariant is well defined because of the existence of the direct bandgap and is computed to be nontrivial.The calculated SHC is as large as 1.25×10^(3)h/e(Ωcm)^(−1)at the Fermi level(EF).By tuning the chemical potential from EF−0.3 to EF+0.3 eV,it varies rapidly and monotonically from−1.2×10^(3)to 3.1×10^(3)h/e(Ωcm)^(−1)In addition,we also find that the Te vacancy in the patterned monolayer can induce excellent HER activity.Our results not only offer a new idea to search 2D materials with large SHC,i.e.,by introducing inversion–symmetry breaking vacancies in large SOC systems,but also provide a feasible system with tunable SHC(by applying gate voltage)and excellent HER activity. | Dexi Shao Junze Deng Haohao Sheng Ruihan Zhang Hongming Weng Zhong Fang Xing-Qiu Chen Yan Sun Zhijun Wang | 2023 | Research2023，，3： | 0 |
| 20 | Electronic structures and topological properties in nickelates Ln_(n+1)Ni_(n)O_(2n+2)显示文摘After the significant discovery of the hole-doped nickelate compound Nd_(0.8)Sr_(0.2)NiO_(2),analyses of the electronic structure,orbital components,Fermi surfaces and band topology could be helpful to underst and the mechanism of its superconductivity.Based on first-principle calculations,we find that Ni3d_(x2-y2)states contribute the largest Fermi surface.The Ln5d_(3z2-r2)states form an electron pocket at,while 5 d_(xy)states form a relatively bigger electron pocket at A.These Fermi surfaces and symmetry characteristics can be reproduced by our two-band model,which consists of two elementary band representations:B1g@1a⊕A1g@1b.We find that there is a band inversion near A,giving rise to a pair of Dirac points along M-A below the Fermi level upon including spin-orbit coupling.Furthermore,we perform density functional theory based Gutzwiller(DFT+Gutzwiller)calculations to treat the strong correlation effect of Ni 3 d orbitals.In particular,the bandwidth of 3d_(x2-y2)has been renormalized largely.After the renormalization of the correlated bands,the Ni 3 d_(xy)states and the Dirac points become very close to the Fermi level.Thus,a hole pocket at A could be introduced by hole doping,which may be related to the observed sign change of the Hall coefficient.By introducing an additional Ni3d_(xy)orbital,the hole-pocket band and the band inversion can be captured in our modified model.Besides,the nontrivial band topology in the ferromagnetic two-layer compound La_(3)Ni_(2)O_(6)is discussed and the band inversion is associated with Ni3d_(x2-y2)and La5d_(xy)orbitals. | Jiacheng Gao Shiyu Peng Zhijun Wang Chen Fang Hongming Weng | 2021 | National Science Review2021，8，8： | 0 |
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