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Wave‐Vector Dependence of the Electron Energy Losses of Boron Nitride and Graphite
Author(s) -
Büchner U.
Publication year - 1977
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220810124
Subject(s) - brillouin zone , boron nitride , graphite , wave vector , electron , condensed matter physics , wave function , materials science , hexagonal boron nitride , dielectric , energy (signal processing) , boron , electronic band structure , nitride , hexagonal crystal system , atomic physics , physics , chemistry , quantum mechanics , crystallography , nanotechnology , optoelectronics , nuclear physics , composite material , layer (electronics) , graphene
Wave‐vector ( q )‐dependent energy loss functions, Im [−ϵ ⟂ (ω, q ⟂ )] −1 , and dielectric functions, ϵ 2⟂ (ω, q ⟂ ), of hexagonal boron nitride and graphite up to q ⟂ ‐values of almost one third of the Brillouin zone and up to energies of 40 eV were derived from electron energy loss measurements. The results are discussed in terms of non‐vertical interband transitions of two‐dimensional band structures.