Abstract
The electroreflectance (ER) spectra of a surface-intrinsic n+-type doped (100) GaAs have been measured at various polarization angles of the probe beam. Several Franz-Keldysh oscillations were observed above the band-gap energy, thus enabling heavy- and light-hole transitions to be separated by the application of the fast Fourier transform to the ER spectra. From this, the ratios of the amplitudes of the light- to heavy-hole transitions versus angle of polarization were obtained. At a large incident angle (80°), the strength of the field of the probe beam in the normal direction of the sample (Fz) was varied from zero to a larger component. It was found that the ratios increased with increasing Fz which is consistent with the theory that the light-hole transition becomes more enhanced with z-polarized light.
Original language | English |
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Pages (from-to) | 78-80 |
Number of pages | 3 |
Journal | Journal of Applied Physics |
Volume | 91 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2002 Jan 1 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy