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Terahertz waveforms emitted from (a) sample 1 and (b) sample 2 measured at for various bias electric fields.
The height of the initial positive peak, , in the terahertz emission waveforms measured at (normalized by the magnitude of photocurrent) and (normalized by its low-field value) are plotted as a function of the bias electric field for samples 1 (circles), 2 (squares), and 3 (triangles). The dashed line is a guide for the eye.
The terahertz spectra obtained from the time-domain terahertz traces emitted from sample 2 under various bias fields at (a) and (b) .
(a) A schematic illustration of the dispersion in GaAs at . (b) A schematic illustration of the - and the satellite valleys at .
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