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(a) Experimental setup. OPM: off-axis parabolic mirror; EO: electro-optic. The coordinate systems of the sample and the laboratory are denoted by and , respectively. The terahertz polarizer only transmits terahertz radiation polarized along , (b) Sample orientation, and (c) Polarization directions of the excitation pulses.
(a) Terahertz traces emitted from shift currents traveling along the -axis generated with linearly polarized light incident on the tilted QW sample. The angle between the linear polarization and the axis was and −45°. (b) Same as in (a) for a (110)-oriented bulk GaAs sample.
(a) Terahertz traces resulting from shift currents for tilt angles and and the axis of the sample pointing along the positive and negative axis of the laboratory frame. (b) Measured tilt angle dependence of the shift current amplitude (solid black) and sinusoidal function (dashed red).
(a) Dependence of the amplitude of the shift current on excitation photon energy in the 8 nm (solid black) and 12 nm (dashed red) QW samples. (b) Terahertz traces resulting from and shift currents in 8 and 12 nm QW samples excited with laser pulses with a photon energy corresponding to the lh-X (solid black) and hh-X (dashed red). In all measurements a tilt angle of has been used.
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