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Calculated and experimental low-loss electron energy loss spectra of dislocations in diamond and GaN

Lookup NU author(s): Professor Patrick Briddon

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Abstract

First-principles calculations of electron energy loss (EEL) spectra for bulk GaN and diamond are compared with experimental spectra acquired with a scanning tunnelling electron microscope offering ultra-high-energy resolution in low-loss energy spectroscopy. The theoretical bulk low-loss EEL spectra, in the Eg to 10 eV range, are in good agreement with experimental data. Spatially resolved spectra from dislocated regions in both materials are distinct from bulk spectra. The main effects are, however, confined to energy losses lying above the band edge. The calculated spectra for low-energy dislocations in diamond are consistent with the experimental observations, but difficulties remain in understanding the spectra of threading dislocations in GaN.


Publication metadata

Author(s): Jones R, Fall CJ, Gutierrez-Sosa A, Bangert U, Heggie MI, Blumenau AT, Frauenheim T, Briddon PR

Publication type: Article

Publication status: Published

Journal: Journal of Physics: Condensed Matter

Year: 2002

Volume: 14

Issue: 48

Pages: 12793-12800

ISSN (print): 0953-8984

ISSN (electronic): 1361-648X

Publisher: Institute of Physics Publishing Ltd.

URL: http://dx.doi.org/10.1088/0953-8984/14/48/318

DOI: 10.1088/0953-8984/14/48/318


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