Ab initio calculation of the reflectance anisotropy of GaAs(110) : the role of nonlocal polarizability and local fields

摘要

We demonstrate that the description of the optical reflectance anisotropy of GaAs(110) requires a complete microscopic treatment of both surface and bulk, which is feasible in the discrete cellular method. This method is an extension of standard discrete dipole calculations and accounts for non-locality in the electro-dynamical and quantum-mechanical interactions through the use of both real space local fields and ab-initio nonlocal polarizabilities. The results of our calculations are in excellent agreement with experiment and we show that the anisotropy is surface induced. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 19]