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arXiv 2020年

作者： Sun, Hai-Peng Wang, C.M. Zhang, Song-Bo Chen, Rui Lu, Hai-Zhou Xie, X.C. Department of Physics Harbin Institute of Technology Harbin150001 China Shenzhen518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China Department of Physics Shanghai Normal University Shanghai200234 China Institute for Theoretical Physics and Astrophysics University of Wurzberg WurzburgD-97074 Germany International Center for Quantum Materials School of Physics Peking University Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Beijing Academy of Quantum Information Sciences West Building 3 No. 10 Xibeiwang East Road BeijingHaidian District100193 China

Recently, the intrinsic magnetic topological insulator MnBi2Te4 has attracted great attention. It has an out-of-plane antiferromagnetic order, which is believed to open a sizable energy gap in the surface states. This gap, however, was not always observable in the latest ARPES experiments. To address this issue, we analytically derive an effective model for the 2D surface states by starting from a 3D Hamiltonian for bulk MnBi2Te4 and taking into account the spatial profile of the bulk magnetization. We suggest that the Bi antisite defects in the Mn atomic layers in the bulk may be one of the reasons for the varied experimental results, since the Bi antisite defects may result in a much smaller and more localized intralayer ferromagnetic order, leading to the diminished surface gap. In addition, we calculate the spatial distribution and penetration depth of the surface states, which are mainly embedded in the first two septuple layers from the terminating surface. From our analytical results, the influence of the bulk parameters on the surface states can be found explicitly. Furthermore, we derive a k·p model for MnBi2Te4 thin films and show the oscillation of the Chern number between odd and even septuple layers. Our results will be helpful for the ongoing explorations of the MnBixTey family. Copyright © 2020, The Authors. All rights reserved.

关键词： Surface states

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SpecDis: Value added distance catalogue for 4 million stars from DESI Year-1 data

arXiv

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arXiv 2025年

作者： Li, Songting Wang, Wenting Koposov, Sergey E. Li, Ting S. Wu, Youjia Valluri, Monica Najita, Joan Prieto, Carlos Allende Byström, Amanda Manser, Christopher J. Han, Jiaxin Palau, Carles G. Yang, Hao Cooper, Andrew P. Kizhuprakkat, Namitha Riley, Alexander H. Aguilar, Jessica Nicole Ahlen, Steven Bianchi, David Brooks, David Claybaugh, Todd de la Macorra, Axel Della Costa, John Dey, Arjun Doel, Peter Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A. Gutierrez, Gaston Honscheid, Klaus Ishak, Mustapha Juneau, Stephanie Kehoe, Robert Kisner, Theodore Landriau, Martin Guillou, Laurent Le Levi, Michael Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Palanque-Delabrouille, Nathalie Percival, Will Poppett, Claire Prada, Francisco Pérez-Ràfols, Ignasi Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Department of Astronomy Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai200240 China State Key Laboratory of Dark Matter Physics School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Institute for Astronomy University of Edinburgh Royal Observatory Blackford Hill EdinburghEH9 3HJ United Kingdom Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Department of Astronomy and Astrophysics University of Toronto 50 St. George Street TorontoONM5S 3H4 Canada Department of Physics University of Michigan 415 Church Street Ann ArborMI48105 United States Leinweber Center for Theoretical Physics University of Michigan 415 Church Street Ann ArborMI48105 United States NSF’s NOIRLab 950 N. Cherry Avenue TucsonAZ85719 United States Instituto de Astrofsica de Canarias C/ Va Lactea s/n Tenerife La LagunaE-38205 Spain Universidad de La Laguna Dpto. Astrofsica Tenerife La LagunaE-38206 Spain Imperial College London South Kensington Campus LondonSW7 2AZ United Kingdom Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai201210 China Institute of Astronomy Department of Physics National Tsing Hua University 101 Kuang-Fu Rd. Sec. 2 Hsinchu30013 Taiwan Center for Informatics and Computation in Astronomy NTHU 101 Kuang-Fu Rd. Sec. 2 Hsinchu30013 Taiwan Institute for Computational Cosmology Department of Physics Durham University South Road DurhamDH1 3LE United Kingdom Lawrence Berkeley National Laboratory 1 Cyclotron Road BerkeleyCA94720 United States Physics Dept. Boston University 590 Commonwealth Avenue BostonMA02215 United States Dipartimento di Fisica "Aldo Pontremoli" Università degli Studi di Milano Via Celoria 16 MilanoI-20133 Italy INAF-Osservatorio Astronomico di Brera Via Brera 28 Milano20122 Italy Department of Physics & Astronomy University College London Gower Street London

We present the SpecDis value added stellar distance catalogue accompanying DESI DR1. SpecDis trains a feed-forward Neural Network (NN) on a large sample of stars with Gaia parallaxes, but without applying selections on parallax error or signal-to-noise (S/N) of the stellar spectra. We incorporate parallax error into the loss function for training. This approach ensures the training sample not suffering from biases. Moreover, SpecDis predicts the reciprocal of the square root of luminosity, which is linearly proportional to parallax and helps to avoid excluding negative parallaxes. To enhance the precision of distance predictions, we employ Principal Component Analysis (PCA) to reduce the noise and dimensionality of stellar spectra. Validated by independent external samples of member stars with precise distances from globular clusters, dwarf galaxies, and stellar streams, combined with BHB stars, we demonstrate that our distance measurements show no significant bias up to 100 kpc, and are much more precise than Gaia parallax beyond 7 kpc. The median distance uncertainties are 23%, 19%, 11% and 7% for S/Neff, indicating stars with low Fe and high α, which form early, may have experienced more encounters and tidal effects to disrupt binaries. Our final catalogue provides distances and distance uncertainties for >4 million stars, offering a valuable resource for Galactic astronomy. Copyright © 2025, The Authors. All rights reserved.

关键词： Galaxies

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Higher-Order Topology of the Axion Insulator EuIn2As2

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Physical Review Letters 2019年第25期122卷 256402-256402页

作者： Yuanfeng Xu Zhida Song Zhijun Wang Hongming Weng Xi Dai Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Max Planck Institute of Microstructure Physics Halle 06120 Germany Department of Physics Princeton University Princeton New Jersey 08544 USA CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Songshan Lake Materials Laboratory Dongguan Guangdong 523808 China Department of Physics Hong Kong University of Science and Technology Clear Water Bay Kowloon 999077 Hong Kong

Based on first-principles calculations and symmetry analysis, we propose that EuIn2As2 is a long-awaited axion insulator with antiferromagnetic (AFM) long-range order. Characterized by the parity-based invariant Z4=2, the topological magnetoelectric effect is quantized with θ=π in the bulk, with a band gap as large as 0.1 eV. When the staggered magnetic moments of the AFM phase are along the a or b axis, it is also a topological crystalline insulator phase with gapless surface states emerging on (100), (010), and (001) surfaces. When the magnetic moments are along the c axis, both the (100) and (001) surfaces are gapped, and the material can also be viewed as a high-order topological insulator with one-dimensional chiral states existing on the hinges between those gapped surfaces. We have calculated both the topological surface states and the hinge state in different phases of the system, respectively, which can be detected by angle-resolved photoemission spectroscopy or STM experiments.

关键词： Antiferromagnetism Quantum anomalous Hall effect Topological insulators DFT+U Wannier function methods k dot p method

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Moments of nucleon generalized parton distributions from lattice QCD simulations at physical pion mass

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Physical Review D 2020年第3期101卷 034519-034519页

作者： C. Alexandrou S. Bacchio M. Constantinou P. Dimopoulos J. Finkenrath R. Frezzotti K. Hadjiyiannakou K. Jansen B. Kostrzewa G. Koutsou C. Lauer C. Urbach Department of Physics University of Cyprus P.O. Box 20537 1678 Nicosia Cyprus Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Strasse Nicosia 2121 Cyprus Department of Physics Temple University 1925 N. 12th Street Philadelphia Pennsylvania 19122-1801 USA Dipartimento di Fisica Università and INFN di Roma Tor Vergata 00133 Roma Italy NIC DESY Platanenallee 6 D-15738 Zeuthen Germany HISKP (Theory) Rheinische Friedrich-Wilhelms-Universität Bonn Nußallee 14-16 53115 Bonn Germany Physics Division Argonne National Laboratory Argonne Illinois 60439 USA

We present results for the moments of nucleon isovector vector and axial generalized parton distribution functions computed within lattice QCD. Three ensembles of maximally twisted mass clover-improved fermions simulated with a physical value of the pion mass are analyzed. Two of these ensembles are generated using two degenerate light quarks. A third ensemble is used having, in addition to the light quarks, strange and charm quarks in the sea. A careful analysis of the convergence to the ground state is carried out that is shown to be essential for extracting the correct nucleon matrix elements. This allows a controlled determination of the unpolarized, helicity, and tensor second Mellin moments. The vector and axial-vector generalized form factors are also computed as a function of the momentum transfer square up to about 1 GeV2. The three ensembles allow us to check for unquenching effects and to assess lattice finite volume effects.

关键词： Lattice QCD Lattice field theory Form factors

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DESI Observations of the Andromeda Galaxy: Revealing the Immigration History of Our Nearest Neighbor

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Astrophysical Journal 2023年第1期944卷 1-1页

作者： Dey, Arjun Najita, Joan R. Koposov, Sergey E. Josephy-Zack, J. Maxemin, Gabriel Bell, Eric F. Poppett, C. Patel, E. Beraldo e Silva, L. Raichoor, A. Schlegel, D. Lang, D. Meisner, A. Myers, Adam D. Aguilar, J. Ahlen, S. Allende Prieto, C. Brooks, D. Cooper, A.P. Dawson, K.S. Macorra, A. de la Doel, P. Font-Ribera, A. García-Bellido, Juan Gontcho A Gontcho, S. Guy, J. Honscheid, K. Kehoe, R. Kisner, T. Kremin, A. Landriau, M. Le Guillou, L. Levi, Michael E. Li, T.S. Martini, Paul Miquel, R. Moustakas, J. Nie, Jundan Palanque-Delabrouille, N. Prada, F. Schlafly, E.F. Sharples, Ray M. Tarlé, Gregory Ting, Yuan-Sen Tyas, L. Valluri, M. Wechsler, Risa H. Zou, H. NSF’s NOIRLab 950 N. Cherry Avenue Tucson 85719 AZ United States Institute for Astronomy University of Edinburgh Royal Observatory Blackford Hill Edinburgh EH9 3HJ United Kingdom Institute of Astronomy University of Cambridge Madingley Road Cambridge CB3 0HA United Kingdom Kavli Institute for Cosmology University of Cambridge Madingley Road Cambridge CB3 0HA United Kingdom Harvard College Cambridge 02138 MA United States Department of Astronomy University of Michigan Ann Arbor 48109 MI United States Lawrence Berkeley National Laboratory 1 Cyclotron Road Berkeley 94720 CA United States Space Sciences Laboratory University of California Berkeley 7 Gauss Way Berkeley 94720 CA United States University of California Berkeley 110 Sproul Hall #5800 Berkeley 94720 CA United States Astronomy Dept. University of California at Berkeley Berkeley 94720 CA United States Lawrence Berkeley National Laboratory Berkeley 94720 CA United States Perimeter Institute for Theoretical Physics 31 Caroline Street N Waterloo N25 2YL ON Canada Department of Physics and Astronomy University of Waterloo Waterloo N2L 3G1 ON Canada Department of Physics & Astronomy University of Wyoming 1000 E. University Dept. 3905 Laramie 82071 WY United States Physics Dept. Boston University 590 Commonwealth Avenue Boston 02215 MA United States Instituto de Astrofísica de Canarias C/ Vía Láctea s/n San Cristóbal de La Laguna Santa Cruz de Tenerife E-38205 Spain Department of Physics & Astronomy University College London Gower Street London WC1E 6BT United Kingdom Institute of Astronomy Department of Physics National Tsing Hua University 101 Kuang-Fu Road Sec. 2 Hsinchu 30013 Taiwan Center for Informatics and Computation in Astronomy NTHU 101 Kuang-Fu Road Sec. 2 Hsinchu 30013 Taiwan Physics Division National Center for Theoretical Sciences Taipei 10617 Taiwan Department of Physics and Astronomy The University of Utah 115 South 1400 East Salt Lake City 8

We present Dark Energy Spectroscopic Instrument (DESI) observations of the inner halo of M31, which reveal the kinematics of a recent merger—a galactic immigration event—in exquisite detail. Of the 11,416 sources studied in 3.75 hr of on-sky exposure time, 7438 are M31 sources with well-measured radial velocities. The observations reveal intricate coherent kinematic structure in the positions and velocities of individual stars: streams, wedges, and chevrons. While hints of coherent structures have been previously detected in M31, this is the first time they have been seen with such detail and clarity in a galaxy beyond the Milky Way. We find clear kinematic evidence for shell structures in the Giant Stellar Stream, the Northeast Shelf, and Western Shelf regions. The kinematics are remarkably similar to the predictions of dynamical models constructed to explain the spatial morphology of the inner halo. The results are consistent with the interpretation that much of the substructure in the inner halo of M31 is produced by a single galactic immigration event 1-2 Gyr ago. Significant numbers of metal-rich stars ([Fe/H] > − 0.5) are present in all of the detected substructures, suggesting that the immigrating galaxy had an extended star formation history. We also investigate the ability of the shells and Giant Stellar Stream to constrain the gravitational potential of M31, and estimate the mass within a projected radius of 125 kpc to be log 10 M NFW ( < 125 kpc ) / M ⊙ = 11.80 − 0.10 + 0.12 . The results herald a new era in our ability to study stars on a galactic scale and the immigration histories of galaxies. © 2023. The Author(s). Published by the American Astronomical Society.

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Enhanced anomalous Hall effect in the magnetic topological semimetal Co3Sn2−xInxS2

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Physical Review B 2020年第12期101卷 125121-125121页

作者： Huibin Zhou Guoqing Chang Guangqiang Wang Xin Gui Xitong Xu Jia-Xin Yin Zurab Guguchia Songtian S. Zhang Tay-Rong Chang Hsin Lin Weiwei Xie M. Zahid Hasan Shuang Jia International Center for Quantum Materials School of Physics Peking University Beijing 100871 China Laboratory for Topological Quantum Matter and Advanced Spectroscopy(B7) Department of Physics Princeton University Princeton New Jersey 08544 USA Department of Chemistry Louisiana State University Baton Rouge Louisiana 70803 USA Laboratory for Muon Spin Spectroscopy Paul Scherrer Institute CH-5232 Villigen PSI Switzerland Department of Physics National Cheng Kung University Tainan 701 Taiwan Institute of Physics Academia Sinica Taipei 11529 Taiwan Princeton Institute for Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Collaborative Innovation Center of Quantum Matter Beijing 100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100190 China Beijing Academy of Quantum Information Sciences West Building 3 No. 10 Xibeiwang East Road Haidian District Beijing 100193 China

We study the anomalous Hall effect (AHE) of single-crystalline Co3Sn2−xInxS2 over a large range of indium concentration x from 0 to 1. Their magnetization reduces progressively with increasing x while their ground state evolves from a ferromagnetic Weyl semimetal into a nonmagnetic insulator. Remarkably, after systematically scaling the AHE, we find that their intrinsic anomalous Hall conductivity (AHC) features an unexpected maximum at around x=0.15. The change of the intrinsic AHC corresponds with the doping evolution of Berry curvature and the maximum arises from the magnetic topological nodal-ring gap. Our experimental results show a larger AHC in a fundamental nodal-ring gap than that of Weyl nodes.

关键词： Anomalous Hall effect Topological materials Crystal growth Density functional theory

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Side-Chain Engineering for Enhancing the Molecular Rigidity and Photovoltaic Performance of Noncovalently Fused-Ring Electron Acceptors

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Angewandte Chemie 2021年第32期133卷

作者： Dr. Xin Zhang Congqi Li Linqing Qin Hao Chen Jianwei Yu Yanan Wei Xingzheng Liu Prof. Jianqi Zhang Prof. Zhixiang Wei Prof. Feng Gao Prof. Qian Peng Prof. Hui Huang College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 China Department of Physics Chemistry and Biology (IFM) Linköping University Linköping 58183 Sweden Center for Excellence in Nanoscience (CAS) & Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS) National Center for Nanoscience and Technology Beijing 100190 China School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 China

Side-chain engineering is an effective strategy to regulate the solubility and packing behavior of organic materials. Recently, a unique strategy, so-called terminal side-chain (T-SC) engineering, has attracted much attention in the field of organic solar cells (OSCs), but there is a lack of deep understanding of the mechanism. Herein, a new noncovalently fused-ring electron acceptor (NFREA) containing two T-SCs ( NoCA-5 ) was designed and synthesized. Introduction of T-SCs can enhance molecular rigidity and intermolecular π–π stacking, which is confirmed by the smaller Stokes shift value, lower reorganization free energy, and shorter π–π stacking distance in comparison to NoCA-1 . Hence, the NoCA-5 -based device exhibits a record power conversion efficiency (PCE) of 14.82 % in labs and a certified PCE of 14.5 %, resulting from a high electron mobility, a short charge-extraction time, a small Urbach energy ( E u ), and a favorable phase separation.

关键词： molecular rigidity noncovalently fused-ring electron acceptors organic solar cells terminal side chains

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High-Performance Noncovalently Fused-Ring Electron Acceptors for Organic Solar Cells Enabled by Noncovalent Intramolecular Interactions and End-Group Engineering

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Angewandte Chemie 2021年第22期133卷

作者： Dr. Xin Zhang Linqing Qin Jianwei Yu Yuhao Li Yanan Wei Xingzheng Liu Prof. Xinhui Lu Prof. Feng Gao Prof. Hui Huang College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 P. R. China Department of Physics Chemistry and Biology (IFM) Linköping University 58183 Linköping Sweden Department of Physics The Chinese University of Hong Kong New Territories Hong Kong 999077 P. R. China

Noncovalently fused-ring electron acceptors (NFREAs) have attracted much attention in recent years owing to their advantages of simple synthetic routes, high yields and low costs. However, the efficiencies of NFREAs based organic solar cells (OSCs) are still far behind those of fused-ring electron acceptors (FREAs). Herein, a series of NFREAs with S⋅⋅⋅O noncovalent intramolecular interactions were designed and synthesized with a two-step synthetic route. Upon introducing π-extended end-groups into the backbones, the electronic properties, charge transport, film morphology, and energy loss were precisely tuned by fine-tuning the degree of multi-fluorination. As a result, a record PCE of 14.53 % in labs and a certified PCE of 13.8 % for NFREAs based devices were obtained. This contribution demonstrated that combining the strategies of noncovalent conformational locks and π-extended end-group engineering is a simple and effective way to explore high-performance NFREAs.

关键词： fine-tuning multi-fluorination noncovalently fused-ring electron acceptors organic solar cells π-extended end-group engineering

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Space qualification of ultrafast laser written integrated waveguide optics

arXiv

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arXiv 2020年

作者： Piacentini, Simone Vogl, Tobias Corrielli, Giacomo Lam, Ping Koy Osellame, Roberto Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 Milano20133 Italy Piazza Leonardo da Vinci 32 Milano20133 Italy Centre for Quantum Computation and Communication Technology Department of Quantum Science Research School of Physics and Engineering Australian National University ActonACT2601 Australia Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-Universitt Jena Jena07745 Germany Cavendish Laboratory University of Cambridge JJ Thomson Avenue CambridgeCB3 0HE United Kingdom

Satellite-based quantum technologies represent a possible route for extending the achievable range of quantum communication, allowing the construction of worldwide quantum networks without quantum repeaters. In space missions, however, the volume available for the instrumentation is limited, and footprint is a crucial specification of the devices that can be employed. Integrated optics could be highly beneficial in this sense, as it allows for the miniaturization of different functionalities in small and monolithic photonic circuits. In this work, we report on the qualification of waveguides fabricated in glass by femtosecond laser micromachining for their use in a low Earth orbit space environment. In particular, we exposed different laser written integrated devices, such as straight waveguides, directional couplers, and Mach-Zehnder interferometers, to suitable proton and γ-ray irradiation. Our experiments show that no significant changes have been induced to their characteristics and performances by the radiation exposure. Our results, combined with the high compatibility of laser-written optical circuits to quantum communication applications, pave the way for the use of laser-written integrated photonic components in future satellite missions. Copyright © 2020, The Authors. All rights reserved.

关键词： Gamma rays

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Tunable discrete scale invariance in transition-metal pentatelluride flakes

arXiv

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arXiv 2020年

作者： Liu, Yanzhao Wang, Huichao Zhu, Haipeng Li, Yanan Ge, Jun Wang, Junfeng Li, Liang Dai, Ji-Yan Yan, Jiaqiang Mandrus, David Joynt, Robert Wang, Jian International Center for Quantum Materials School of Physics Peking University Beijing100871 China School of Physics Sun Yat-Sen University Guangzhou510275 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Department of Applied Physics Hong Kong Polytechnic University Kowloon Hong Kong Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Materials Science and Engineering University of Tennessee KnoxvilleTN37996 United States Kavli Institute of Theoretical Sciences Chinese Academy of Sciences Beijing100049 China Department of Physics University of Wisconsin-Madison 1150 Univ. Ave. MadisonWI53706 United States CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Beijing Academy of Quantum Information Sciences Beijing100193 China

Log-periodic quantum oscillations discovered in transition-metal pentatelluride give a clear demonstration of discrete scale invariance (DSI) in solid-state materials. The peculiar phenomenon is convincingly interpreted as the presence of two-body quasi-bound states in a Coulomb potential. However, the modifications of the Coulomb interactions in many-body systems having a Dirac-like spectrum are not fully understood. Here, we report the observation of tunable log-periodic oscillations and DSI in ZrTe5 and HfTe5 flakes. By reducing the flakes thickness, the characteristic scale factor is tuned to a much smaller value due to the reduction of the vacuum polarization effect. The decreasing of the scale factor demonstrates the many-body effect on the DSI, which has rarely been discussed hitherto. Furthermore, the cut-offs of oscillations are quantitatively explained by considering the Thomas-Fermi screening effect. Our work clarifies the many-body effect on DSI and paves a way to tune the DSI in quantum materials. © 2020, CC-BY.

关键词： Tellurium compounds

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