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Experimental apparatus used to collect OPTP spectra.
One-dimensional pump scans at of 0, 6, and , respectively. Inset: dependence of the terahertz peak value at delay time of .
The schematic GaAs band structure. Optical photon excites electrons directly into the valley. A fraction of electrons subsequently transfer into the valley at high .
The complex photoconductivity under of (a) and (b), respectively. The solid lines are the fitting curves using the Drude–Smith model.
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