Abstract
The anisotropy of the electronic structure of ternary nanolaminate is investigated by bulk-sensitive soft x-ray emission spectroscopy. The measured polarization-dependent emission spectra of , , , and in are compared with those from monocarbide VC and pure Ge. The experimental emission spectra are interpreted with calculated spectra using ab initio density-functional theory including dipole transition matrix elements. Different types of covalent chemical bond regions are revealed: bonding at , bonding at , and interaction mediated via the orbitals at below the Fermi level. We find that the anisotropic effects are high for the valence states and the shallow core levels of Ge, while relatively small anisotropy is detected for the states. The macroscopic properties of the nanolaminate result from the chemical bonds with the anisotropic pattern as shown in this work.
- Received 10 March 2008
DOI:https://doi.org/10.1103/PhysRevB.78.035117
©2008 American Physical Society