Title | Tight-binding model for the x-ray absorption and emission spectra of dilute GaNxAs1-x at the nitrogen K edge |
Publication Type | Journal Article |
Year of Publication | 2004 |
Authors | Nodwell, E., M. Adamcyk, A. Ballestad, T. Tiedje, S. Tixier, S. E. Webster, E. C. Young, A. Moewes, E. Z. Kurmaev, and T. van Buuren |
Journal | Physical Review B |
Volume | 69 |
ISSN | 1098-0121 |
Abstract | X-ray absorption and fluorescence spectra have been measured at the nitrogen K edge of dilute GaNxAs1-x alloys. The x-ray spectra are in good agreement with an sp(3)s(*) tight-binding model in which nitrogen is included in a supercell configuration and the disorder in the nitrogen distribution is neglected. A strong peak in the x-ray absorption spectrum is interpreted as a nitrogen resonant state in the conduction band rather than as an electron-hole exciton. The tight-binding calculation is also in good agreement with the observed nitrogen concentration dependence of the optical band gap. |
URL | http://dx.doi.org/10.1103/PhysRevB.69.155210 |
DOI | 10.1103/PhysRevB.69.155210 |