Physics – Condensed Matter – Materials Science
Scientific paper
1997-12-19
Physics
Condensed Matter
Materials Science
RevTeX 4 pages, 2 figures
Scientific paper
10.1103/PhysRevB.57.R9427
Ab initio electronic structure studies of prototypical polar interfaces of wurtzite III-V nitrides show that large uniform electric fields exist in epitaxial nitride overlayers, due to the discontinuity across the interface of the macroscopic polarization of the constituent materials. Polarization fields forbid a standard evaluation of band offsets and formation energies: using new techniques, we find a large forward-backward asymmetry of the offset (0.2 eV for AlN/GaN (0001), 0.85 eV for GaN/AlN (0001)), and tiny interface formation energies.
Bernardini Fabio
Fiorentini Vincenzo
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