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Field-Tunable One-Sided Higher-Order Topological Hinge States in Dirac Semimetals

Physical Review Letters 2021年第6期127卷 066801-066801页

作者： Rui Chen Tianyu Liu C. M. Wang Hai-Zhou Lu X. C. Xie Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology (SUSTech) Shenzhen 518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen 518055 China School of Physics Southeast University Nanjing 211189 China Max-Planck-Institut für Physik komplexer Systeme 01187 Dresden Germany Department of Physics Shanghai Normal University Shanghai 200234 China International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Beijing Academy of Quantum Information Sciences Beijing 100193 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China

Recently, higher-order topological matter and 3D quantum Hall effects have attracted a great amount of attention. The Fermi-arc mechanism of the 3D quantum Hall effect proposed to exist in Weyl semimetals is characterized by the one-sided hinge states, which do not exist in all the previous quantum Hall systems, and more importantly, pose a realistic example of the higher-order topological matter. The experimental effort so far is in the Dirac semimetal Cd3As2, where, however, time-reversal symmetry leads to hinge states on both sides of the top and bottom surfaces, instead of the aspired one-sided hinge states. We propose that under a tilted magnetic field, the hinge states in Cd3As2-like Dirac semimetals can be one sided, highly tunable by field direction and Fermi energy, and robust against weak disorder. Furthermore, we propose a scanning tunneling Hall measurement to detect the one-sided hinge states. Our results will be insightful for exploring not only the quantum Hall effects beyond two dimensions, but also other higher-order topological insulators in the future.

关键词： Quantum Hall effect Dirac semimetal Topological materials

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Spinful topological phases in acoustic crystals with projective PT symmetry

arXiv

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arXiv 2022年

作者： Meng, Yan Lin, Shuxin Shi, Bin-Jie Wei, Bin Yang, Linyun Yan, Bei Zhu, Zhenxiao Xi, Xiang Wang, Yin Ge, Yong Yuan, Shou-Qi Chen, Jingming Liu, Guigeng Sun, Hongxiang Chen, Hongsheng Yang, Yihao Gao, Zhen Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China Research Center of Fluid Machinery Engineering and Technology Faculty of Science Jiangsu University Zhenjiang212013 China SKLSM Institute of Semiconductors Chinese Academy of Sciences Beijing100083 China Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore State Key Laboratory of Acoustics Institute of Acoustics Chinese Academy of Sciences Beijing100190 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering ZJU-UIUC Institute Zhejiang University Hangzhou310027 China

For the classification of topological phases of matter, an important consideration is whether a system is spinless or spinful, as these two classes have distinct symmetry algebra that gives rise to fundamentally different topological phases. However, only recently has it been realized theoretically that in the presence of gauge symmetry, the algebraic structure of symmetries can be projectively represented, which possibly enables the switch between spinless and spinful topological phases. Here, we report the first experimental demonstration of this idea by realizing spinful topological phases in "spinless" acoustic crystals with projective space-time inversion symmetry. In particular, we realize a DIII-class one-dimensional topologically gapped phase characterized by a 2 winding number, which features Kramers degenerate bands and Kramers pair of topological boundary modes. Our work thus overcomes a fundamental constraint on topological phases by spin classes. Copyright © 2022, The Authors. All rights reserved.

关键词： Algebra

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Robust topological edge states and superconductivity in few-layer stanene

Research Square

引用

Research Square 2021年

作者： Zhao, Chenxiao Li, Leiqiang Zhang, Liying Qin, Jin Ma, Haiyang Xia, Bing Yang, Bo Zheng, Hao Wang, Shiyong Liu, Canhua Li, Yaoyi Guan, Dandan Cui, Ping Zhang, Zhenyu Jia, Jinfeng Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Anhui Hefei230026 China University of Science and Technology of China China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai200240 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

Stanene was proposed to be a large-gap quantum spin Hall insulator, yet to date, convincing evidence of topological edge states in stanene remains to be seen, partly due to the fact that the topological property depends on the interplay between substrate, chemical functionalization, and layer thickness. Here we fabricate 1-5 layer high-quality stanene films on the Bi(111) substrate by using hydrogen atoms as surfactants, and demonstrate their strikingly robust nontrivial topology using scanning tunneling microscopy/spectroscopy and first-principles calculations. The observed topological edge states possess a bilateral-penetration depth shorter than 4 nm, allowing the formation of dense and parallel multi-edge-channels. Our calculations further show that surface hydrogenation helps to improve the quality of stanene films, while the Bi substrate endows the films with robust nontrivial topology. These stanene films also exhibit superconductivity, and the coexistence of nontrivial topology and superconductivity renders them distinct potential to become the simplest one-dimensional topological superconductors. © 2021, CC BY.

关键词： Superconducting materials

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Induced anomalous Hall effect of massive Dirac fermions in ZrTe5 and HfTe5 thin flakes

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Physical Review B 2021年第20期103卷 L201110-L201110页

作者： Yanzhao Liu Huichao Wang Huixia Fu Jun Ge Yanan Li Chuanying Xi Jinglei Zhang Jiaqiang Yan David Mandrus Binghai Yan Jian Wang International Center for Quantum Materials School of Physics Peking University Beijing 100871 China School of Physics Sun Yat-Sen University Guangzhou 510275 China Department of Condensed Matter Physics Weizmann Institute of Science Rehovot 7610001 Israel High Magnetic Field Laboratory Chinese Academy of Sciences Hefei 230031 Anhui China Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Department of Materials Science and Engineering University of Tennessee Knoxville Tennessee 37996 USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Beijing Academy of Quantum Information Sciences Beijing 100193 China

Research on the anomalous Hall effect (AHE) has been lasting for a century to make clear the underlying physical mechanism. Generally, the AHE appears in magnetic materials, in which the extrinsic process related to scattering effects and intrinsic contribution connected with Berry curvature are crucial. Recently, AHE has been counterintuitively observed in nonmagnetic topological materials and attributed to the existence of Weyl points. However, the Weyl point scenario would lead to unsaturated AHE even in large magnetic fields and contradicts the saturation of AHE in several tesla (T) in experiments. In this work, we investigate the Hall effect of ZrTe5 and HfTe5 thin flakes in static ultrahigh magnetic fields up to 33 T. We find the AHE saturates to 55(70)Ω1cm1 for ZrTe5 (HfTe5) thin flakes above ∼10T. Combining detailed magnetotransport experiments and Berry curvature calculations, we clarify that the splitting of massive Dirac bands without Weyl points can be responsible for AHE in nonmagnetic topological materials ZrTe5 and HfTe5 thin flakes. This model can identify our thin flake samples to be weak topological insulators and serve as a tool to probe the band structure topology in topological materials.

关键词： Anomalous Hall effect Electronic structure Magnetotransport Mesoscopics Topological materials Topological insulators GGA Hall bar Pseudopotentials

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A More Precise Measurement of the Radius of PSR J0740+6620 Using Updated NICER Data

arXiv

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arXiv 2024年

作者： Dittmann, Alexander J. Miller, M. Coleman Lamb, Frederick K. Holt, Isiah Chirenti, Cecilia Wolff, Michael T. Bogdanov, Slavko Guillot, Sebastien Ho, Wynn C.G. Morsink, Sharon M. Arzoumanian, Zaven Gendreau, Keith C. Department of Astronomy Joint Space-Science Institute University of Maryland College ParkMD20742-2421 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Illinois Center for Advanced Studies of the Universe Department of Physics University of Illinois at Urbana-Champaign 1110 West Green Street UrbanaIL61801-3080 United States Department of Astronomy University of Illinois at Urbana-Champaign 1002 West Green Street UrbanaIL61801-3074 United States X-Ray Astrophysics Laboratory NASA Goddard Space Flight Center Code 662 GreenbeltMD20771 United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Center for Research and Exploration in Space Science and Technology NASA/GSFC GreenbeltMD20771 United States Center for Mathematics Computation and Cognition UFABC SP Santo André09210-170 Brazil Space Science Division U.S. Naval Research Laboratory WashingtonDC20375-5352 United States Columbia Astrophysics Laboratory Columbia University 550 West 120th Street New YorkNY10027 United States Institut de Recherche en Astrophysique et Planétologie UPS-OMP CNRS CNES 9 avenue du Colonel Roche BP 44346 ToulouseF-31028 Cedex 4 France Department of Physics and Astronomy Haverford College 370 Lancaster Avenue HaverfordPA19041 United States Department of Physics University of Alberta EdmontonABT6G 2E1 Canada

PSR J0740+6620 is the neutron star with the highest precisely determined mass, inferred from radio observations to be 2.08 ± 0.07 M☉. Measurements of its radius therefore hold promise to constrain the properties of the cold, catalyzed, high-density matter in neutron star cores. Previously, Miller et al. (2021) and Riley et al. (2021) reported measurements of the radius of PSR J0740+6620 based on Neutron Star Interior Composition Explorer (NICER) observations accumulated through 17 April 2020, and an exploratory analysis utilizing NICER background estimates and a data set accumulated through 28 December 2021 was presented in Salmi et al. (2022). Here we report an updated radius measurement, derived by fitting models of X-ray emission from the neutron star surface to NICER data accumulated through 21 April 2022, totaling ∼ 1.1 Ms additional exposure compared to the data set analyzed in Miller et al. (2021) and Riley et al. (2021), and to data from X-ray Multi-Mirror (XMM-Newton) observations. We find that the equatorial circumferential radius of PSR J0740+6620 is 12.92+2.09-1.13 km (68% credibility), a fractional uncertainty ∼ 83% the width of that reported in Miller et al. (2021), in line with statistical expectations given the additional data. If we were to require the radius to be less than 16 km, as was done in Salmi et al. (2024), then our 68% credible region would become R = 12.76-1.02+1.49 km, which is close to the headline result of Salmi et al. (2024). Our updated measurements, along with other laboratory and astrophysical constraints, imply a slightly softer equation of state than that inferred from our previous measurements. Copyright © 2024, The Authors. All rights reserved.

关键词： Neutrons

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Magnetic Weyl Semimetallic Phase in Thin Films of Eu2Ir2O7

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Physical Review Letters 2021年第27期127卷 277204-277204页

作者： Xiaoran Liu Shiang Fang Yixing Fu Wenbo Ge Mikhail Kareev Jong-Woo Kim Yongseong Choi Evguenia Karapetrova Qinghua Zhang Lin Gu Eun-Sang Choi Fangdi Wen Justin H. Wilson Gilberto Fabbris Philip J. Ryan John W. Freeland Daniel Haskel Weida Wu J. H. Pixley Jak Chakhalian Department of Physics and Astronomy Rutgers University Piscataway New Jersey 08854 USA Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Science Beijing 10019 P. R. China Center for Materials Theory Rutgers University Piscataway New Jersey 08854 USA X-ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA National High Magnetic Field Laboratory Florida State University Tallahassee Florida 32310 USA Department of Physics and Astronomy Louisiana State University Baton Rouge Louisiana 70803 USA Center for Computation & Technology Louisiana State University Baton Rouge Louisiana 70803 USA Center for Computational Quantum Physics Flatiron Institute 162 5th Avenue New York New York 10010 USA Physics Department Princeton University Princeton New Jersey 08544 USA

The interplay between electronic interactions and strong spin-orbit coupling is expected to create a plethora of fascinating correlated topological states of quantum matter. Of particular interest are magnetic Weyl semimetals originally proposed in the pyrochlore iridates, which are only expected to reveal their topological nature in thin film form. To date, however, direct experimental demonstrations of these exotic phases remain elusive, due to the lack of usable single crystals and the insufficient quality of available films. Here, we report on the discovery of signatures for the long-sought magnetic Weyl semimetallic phase in (111)-oriented Eu2Ir2O7 high-quality epitaxial thin films. We observed an intrinsic anomalous Hall effect with colossal coercivity but vanishing net magnetization, which emerges right below the onset of a peculiar magnetic phase with all-in-all-out (AIAO) antiferromagnetic ordering. The anomalous Hall conductivity obtained experimentally is consistent with the theoretical prediction, likely arising from the nonzero Berry curvature emanated by Weyl node pairs near the Fermi level that act as sources and sinks of Berry flux, activated by broken cubic crystal symmetry at the top and bottom terminations of the thin film.

关键词： Anomalous Hall effect Antiferromagnetism Topological phases of matter Thin films Weyl semimetal First-principles calculations X-ray magnetic circular dichroism X-ray resonant magnetic scattering

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Beating standard quantum limit via two-axis magnetic susceptibility measurement

arXiv

引用

arXiv 2021年

作者： Wang, Zheng-An Peng, Yi Yu, Dapeng Fan, Heng Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100190 China Shenzhen Insititute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China

We report a metrology scheme which measures magnetic susceptibility of an atomic spin ensemble along the x and z direction and produces parameter estimation with precision beating the standard quantum limit. The atomic ensemble is initialized via one-axis spin squeezing with optimized squeezing time and parameter to be estimated is assumed as uniformly distributed between 0 and 2π. One estimation of φ can be produced with every two magnetic susceptibility data measured along the two axis respectively, which has imprecision scaling (1.43 ± 0.02)/N0.687±0.003 with respect to the number N of atomic spins. The measurement scheme is easy to implement and thus one step towards practical application of quantum metrology. Copyright © 2021, The Authors. All rights reserved.

关键词： Magnetic susceptibility

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Evidence for a strong 19.5 Hz flux oscillation in Swift BAT and Fermi GBM gamma-ray data from GRB 211211A

arXiv

引用

arXiv 2023年

作者： Chirenti, Cecilia Dichiara, Simone Lien, Amy Miller, M. Coleman Department of Astronomy University of Maryland College ParkMD20742 United States Astroparticle Physics Laboratory NASA/GSFC GreenbeltMD20771 United States Center for Research and Exploration in Space Science and Technology NASA/GSFC GreenbeltMD20771 United States Center for Mathematics Computation and Cognition UFABC SP Santo Andre09210-170 Brazil Department of Astronomy and Astrophysics The Pennsylvania State University 525 Davey Lab University ParkPA16802 United States Department of Chemistry Biochemistry and Physics University of Tampa 401 W. Kennedy Blvd TampaFL33606 United States Department of Astronomy Joint Space-Science Institute University of Maryland College ParkMD20742-2421 United States

The gamma-ray burst (GRB) GRB 211211A is believed to have occurred due to the merger of two neutron stars or a neutron star and a black hole, despite its duration of more than a minute. Subsequent analysis has revealed numerous interesting properties including the possible presence of a ∼ 22 Hz quasiperiodic oscillation (QPO) during precursor emission. Here we perform timing analysis of Fermi and Swift gamma-ray data on GRB 211211A and, although we do not find a strong QPO during the precursor, we do find an extremely significant 19.5 Hz flux oscillation, which has higher fractional amplitude at higher energies, in a ∼ 0.2 second segment beginning ∼ 1.6 seconds after the start of the burst. After presenting our analysis we discuss possible mechanisms for the oscillation. Copyright © 2023, The Authors. All rights reserved.

关键词： Gamma rays

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Rotational symmetry breaking in superconducting nickelate Nd0.8Sr0.2NiO2 films

arXiv

引用

arXiv 2022年

作者： Ji, Haoran Li, Yanan Liu, Yi Ding, Xiang Xie, Zheyuan Qi, Shichao Qiao, Liang Yang, Yi-Feng Zhang, Guang-Ming Wang, Jian International Center for Quantum Materials School of Physics Peking University Beijing100871 China Department of Physics Renmin University of China Beijing100872 China School of Physics University of Electronic Science and Technology of China Chengdu610054 China Beijing National Lab for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing100190 China School of Physical Sciences University of Chinese Academy of Sciences Beijing100049 China Songshan Lake Materials Laboratory Guangdong Dongguan523808 China State Key Laboratory of Low-Dimensional Quantum Physics Department of Physics Tsinghua University Beijing100084 China Frontier Science Center for Quantum Information Beijing100084 China Collaborative Innovation Center of Quantum Matter Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Beijing Academy of Quantum Information Sciences Beijing100193 China

The infinite-layer nickelates, isostructural to the high-Tc superconductor cuprates, have risen as a promising platform to host unconventional superconductivity and stimulated growing interests in the condensed matter community. Despite numerous researches, the superconducting pairing symmetry of the nickelate superconductors, the fundamental characteristic of a superconducting state, is still under debate. Moreover, the strong electronic correlation in the nickelates may give rise to a rich phase diagram, where the underlying interplay between the superconductivity and other emerging quantum states with broken symmetry is awaiting exploration. Here, we study the angular dependence of the transport properties on the infinite-layer nickelate Nd0.8Sr0.2NiO2 superconducting films with Corbino-disk configuration. The azimuthal angular dependence of the magnetoresistance (R()) manifests the rotational symmetry breaking from isotropy to four-fold (C4) anisotropy with increasing magnetic field, revealing a symmetry breaking phase transition. Approaching the low temperature and large magnetic field regime, an additional two-fold (C2) symmetric component in the R() curves and an anomalous upturn of the temperature-dependent critical field are observed simultaneously, suggesting the emergence of an exotic electronic phase. Our work uncovers the evolution of the quantum states with different rotational symmetries and provides deep insight into the global phase diagram of the nickelate superconductors. © 2022, CC BY.

关键词： Copper compounds

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Revisiting the DD∗ chiral interactions with the local momentum-space regularization up to the third order and the nature of Tcc+

arXiv

引用

arXiv 2022年

作者： Wang, Bo Meng, Lu School of Physical Science and Technology Hebei University Baoding071002 China Key Laboratory of High-precision Computation Application of Quantum Field Theory of Hebei Province Baoding071002 China Research Center for Computational Physics of Hebei Province Baoding071002 China Ruhr-Universität Bochum Fakultät für Physik und Astronomie Institut für Theoretische Physik II BochumD-44780 Germany

We revisit the DD∗ interactions in chiral effective field theory up to the third order for the first time. We deal with the pion-exchanged interactions via local momentum-space regularization, in which we focus on their long-range behaviors through demanding their contributions vanish at the origin in the coordinate space. The short-range contact interactions and subleading pion-charmed meson couplings are estimated with the phenomenological resonance saturation model. The subleading pion-charmed meson couplings are much weaker than those in the pion-nucleon system, thus the DD∗ binding mechanism is very different with that of the NN system. We also obtain the analytic structure of the two-pion exchange interactions in the coordinate space, and we find that its asymptotic behavior at long distance is similar to but slightly different with the NN interactions. We get the same asymptotic behavior of the two-pion exchange interaction with that from HAL QCD method but appearing in the longer distance rather than 1 cc+ © 2022, CC BY.

关键词： Couplings

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