Effects of vacancies on high-order harmonic generation in a linear chain with band gap

Abstract

In this paper, high-order harmonic generation (HHG) in imperfect lattices with one or several point defect vacancies either being evenly distributed, or localized at neighboring lattice points, is studied by two different realizations of linear chain systems. The authors search for detectable signatures of finite structure in the HHG spectra and also investigate the role of vacancy-induced defect-state orbitals in the HHG process.