Fano profiles of absorption lines from the localised vibrational modes of Be acceptors in GaAs and B acceptors in silicon

Abstract
Infrared absorption measurements have been made of the LVMS of 9Be acceptors in MBE GaAs and 10B and 11B acceptors in ion-implanted Si. The former line is asymmetric, while the latter lines occur as anti-resonances in the electronic continuum. Following 2 MeV electron irradiation to effect electrical compensation, symmetrical lines were observed. The new data for GaAs:Be explain an apparent anomaly relating to LVM line strengths in hydrogen-passivated material.