High-Pressure Synthesis of Dirac Materials: Layered van der Waals Bonded BeN4 Polymorph

作     者：Maxim Bykov Timofey Fedotenko Stella Chariton Dominique Laniel Konstantin Glazyrin Michael Hanfland Jesse S. Smith Vitali B. Prakapenka Mohammad F. Mahmood Alexander F. Goncharov Alena V. Ponomareva Ferenc Tasnádi Alexei I. Abrikosov Talha Bin Masood Ingrid Hotz Alexander N. Rudenko Mikhail I. Katsnelson Natalia Dubrovinskaia Leonid Dubrovinsky Igor A. Abrikosov 

作者机构：The Earth and Planets Laboratory Carnegie Institution for Science Washington D.C. 20015 USA College of Arts and Science Howard University Washington D.C. 20059 USA Material Physics and Technology at Extreme Conditions Laboratory of Crystallography University of Bayreuth 95440 Bayreuth Germany Center for Advanced Radiation Sources University of Chicago Chicago Illinois 60637 USA Photon Sciences Deutsches Electronen Synchrotron (DESY) D-22607 Hamburg Germany European Synchrotron Radiation Facility 38043 Grenoble Cedex 9 France HPCAT X-ray Science Division Argonne National Laboratory Argonne Illinois 60439 USA Materials Modeling and Development Laboratory National University of Science and Technology “MISIS” 119049 Moscow Russia Department of Physics Chemistry and Biology (IFM) Linköping University SE-58183 Linköping Sweden Department of Science and Technology (ITN) Linköping University SE-60174 Norrköping Sweden Radboud University Institute for Molecules and Materials 6525AJ Nijmegen The Netherlands Key Laboratory of Artificial Micro- and Nano-Structures of Ministry of Education and School of Physics and Technology Wuhan University Wuhan 430072 China Department of Theoretical Physics and Applied Mathematics Ural Federal University 620002 Ekaterinburg Russia Bayerisches Geoinstitut University of Bayreuth 95440 Bayreuth Germany 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2021年第126卷第17期

页      面：175501-175501页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：DOE-NNSA’s Office of Experimental Sciences National Science Foundation–Earth Sciences, (EAR–1634415) U.S. Department of Energy, USDOE, (DE-FG02-94ER14466) U.S. Department of Energy, USDOE Army Research Office, ARO, (W911NF-19-2-0172) Army Research Office, ARO California Department of Fish and Game, DFG, (DU 393-13/1, DU 393-9/2, DU 954-11/1) California Department of Fish and Game, DFG Alexander von Humboldt-Stiftung, AvH Office of Science, SC Argonne National Laboratory, ANL, (DE-AC02-06CH11357) Argonne National Laboratory, ANL Smithsonian Environmental Research Center, SERC Deutsche Forschungsgemeinschaft, DFG VINNOVA, (2016-07213, 2016–05156) VINNOVA Bundesministerium für Bildung und Forschung, BMBF, (05K19WC1) Bundesministerium für Bildung und Forschung, BMBF Ministry of Education and Science of the Russian Federation, Minobrnauka Linköpings Universitet, LiU, (2009 00971) Linköpings Universitet, LiU Knut och Alice Wallenbergs Stiftelse, (KAW-2018.0194) Knut och Alice Wallenbergs Stiftelse Vetenskapsrådet, VR, (2019-05600) Vetenskapsrådet, VR Russian Science Foundation, RSF, (18-12-00492) Russian Science Foundation, RSF National University of Science and Technology, MISIS, (K2-2020-026) National University of Science and Technology, MISIS 

主　　题：Chemical bonding Crystal structure Dirac fermions Pressure effects 

摘      要：High-pressure chemistry is known to inspire the creation of unexpected new classes of compounds with exceptional properties. Here, we employ the laser-heated diamond anvil cell technique for synthesis of a Dirac material BeN4. A triclinic phase of beryllium tetranitride tr−BeN4 was synthesized from elements at ∼85 GPa. Upon decompression to ambient conditions, it transforms into a compound with atomic-thick BeN4 layers interconnected via weak van der Waals bonds and consisting of polyacetylene-like nitrogen chains with conjugated π systems and Be atoms in square-planar coordination. Theoretical calculations for a single BeN4 layer show that its electronic lattice is described by a slightly distorted honeycomb structure reminiscent of the graphene lattice and the presence of Dirac points in the electronic band structure at the Fermi level. The BeN4 layer, i.e., beryllonitrene, represents a qualitatively new class of 2D materials that can be built of a metal atom and polymeric nitrogen chains and host anisotropic Dirac fermions.