Photoemission properties of GaAs (100) \beta 2(2 \times 4) and GaAs (100) (4 \ti

Using the first-principles plane-wave pseudopotential method, based on the density function theory, the electron structure and optical properties of GaAs (100) \beta 2(2 \times 4) and GaAs (100) (4 \times 2) reconstructions are calculated. The formation energy of As-rich \beta 2(2 \times 4) reconstr