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(Color online) (a) Schematic view of the 2DEG sample and the experimental setup. The and wide planar channels are carved out by standard photolithography and wet etching. (b) Time-resolved Kerr rotation measurement finds a spin decoherence time of . Black line: experimental data; redline: fitting with a single expopnential function . The spin coherence length is estimated to lie between the width of the narrow and wide channels.
(Color online) (a) Linearly polarized light beam, polarized along axis as indicated by red color or along axis as indicated by blue color, scans along the narrow channel ( axis) at normal incidence. (b) Flow pattern of measured electric currents for light spot along the narrow channel. [(c)–(e)] Typical charge currents through all the terminals as a function of the light spot position at axis.
(Color online) Charge current (black square) at channel junction varies with the polarization angel of light relative to the lab frame, as shown in the inset. The red curve is a fit of .
(Color online) Charge currents (red) and (black) show strong position dependence when the light scans along . The current (green) is negligible when the light scans along . The inset is the flow pattern of measured electric current for light spot scanning along the edge.
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