Electronic structure and chemical bonding anisotropy investigation of wurtzite AlN

Abstract

The electronic structure and the anisotropy of the Al - N π and σ chemical bonding of wurtzite AlN has been investigated by bulk-sensitive total fluorescence yield absorption and soft x-ray emission spectroscopies. The measured N K, Al L1, and Al L2,3 x-ray emission and N 1s x-ray absorption spectra are compared with calculated spectra using first principles density-functional theory including dipole transition matrix elements. The main N 2p - Al 3p hybridization regions are identified at -1.0 to -1.8 eV and -5.0 to -5.5 eV below the top of the valence band. In addition, N 2s - Al 3p and N 2s - Al 3s hybridization regions are found at the bottom of the valence band around -13.5 eV and -15 eV, respectively. A strongly modified spectral shape of Al 3s states in the Al L2,3 emission from AlN in comparison to Al metal is found, which is also reflected in the N 2p - Al 3p hybridization observed in the Al L1 emission. The differences between the electronic structure and chemical bonding of AlN and Al metal are discussed in relation to the position of the hybridization regions and the valence band edge influencing the magnitude of the large band gap.

12 pages, 3 figures, http://link.aps.org/doi/10.1103/PhysRevB.80.155105

References in corpus (6)

• Bonding mechanism in the nitrides Ti2AlN and TiN: an experimental and theoretical investigation
• Energy Dependence of Cu L2,3 Satellites using Synchrotron Excited X-ray Emission Spectroscopy
• Electronic structure investigation of CeB6 by means of soft X-ray scattering
• Electronic structure investigation of the cubic inverse perovskite Sc3AlN
• Anisotropy in the electronic structure of V2GeC investigated by soft x-ray emission spectroscopy and first-principles theory
• Large magnetic circular dichroism in resonant inelastic x-ray scattering at the Mn L-edge of Mn-Zn ferrite

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