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|Title:||High-Pressure Synthesis of Dirac Materials: Layered van der Waals Bonded BeN4 Polymorph|
Smith, J. S.
Prakapenka, V. B.
Mahmood, M. F.
Goncharov, A. F.
Ponomareva, A. V.
Abrikosov, A. I.
Bin, Masood, T.
Rudenko, A. N.
Katsnelson, M. I.
Abrikosov, I. A.
|Publisher:||American Physical Society|
|Citation:||High-Pressure Synthesis of Dirac Materials: Layered van der Waals Bonded BeN4 Polymorph / M. Bykov, T. Fedotenko, S. Chariton, et al. — DOI 10.1103/PhysRevLett.126.175501 // Physical Review Letters. — 2021. — Vol. 126. — Iss. 17. — 175501.|
|Abstract:||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. © 2021 American Physical Society.|
HIGH PRESSURE ENGINEERING
VAN DER WAALS FORCES
ELECTRONIC BAND STRUCTURE
LASER-HEATED DIAMOND ANVIL CELLS
VAN DER WAALS BONDS
|metadata.dc.description.sponsorship:||Parts of this research were carried out at the Extreme Conditions Beamline (P02.2) at DESY, a member of Helmholtz Association (HGF). Portions of this work were performed on beamline ID15 at the European Synchrotron Radiation Facility (ESRF), Grenoble, France. Portions of this work were performed at GeoSoilEnviroCARS (The University of Chicago, Sector 13) and at HPCAT (sector 16) of the Advanced Photon Source (APS), Argonne National Laboratory. Research was sponsored by the Army Research Office and was accomplished under the Cooperative Agreement No. W911NF-19-2-0172. N. D. and L. D. thank the Deutsche Forschungsgemeinschaft (DFG Projects No. DU 954-11/1, No. DU 393-9/2, and No. DU 393-13/1) and the Federal Ministry of Education and Research, Germany (BMBF, Grant No. No. 05K19WC1) for financial support. D. L. thanks the Alexander von Humboldt Foundation for financial support. Theoretical analysis of chemical bonding was supported by the Russian Science Foundation (Project No. 18-12-00492). Calculations of the phonon dispersion relations were supported by the Ministry of Science and Higher Education of the Russian Federation in the framework of Increase Competitiveness Program of NUST MISIS (No. K2-2020-026) implemented by governmental decree No. 211. Support from the Knut and Alice Wallenberg Foundation (Wallenberg Scholar Grant No. KAW-2018.0194), the Swedish Government Strategic Research Areas in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU No. 2009 00971) and SeRC, the Swedish Research Council (VR) Grant No. 2019-05600 and Vinnova VINN Excellence Center Functional Nanoscale Materials (FunMat-2) Grant No. 2016–05156 is gratefully acknowledged. The computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) partially funded by the Swedish Research Council through Grant Agreement No. 2016-07213. The work of M. I. K. was supported by the JTC-FLAGERA Project GRANSPORT. GeoSoilEnviroCARS is supported by the National Science Foundation–Earth Sciences (EAR–1634415) and Department of Energy-Geosciences (DE-FG02-94ER14466). HPCAT operations are supported by DOE-NNSA’s Office of Experimental Sciences. Advanced Photon Source is U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.|
|RSCF project card:||18-12-00492|
|Appears in Collections:||Научные публикации, проиндексированные в SCOPUS и WoS CC|
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