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Schematic energy band diagram of two-color excitation method. Electric fields exist induced by the surface field. A green laser creates an electron in a QD and a red laser creates an exciton, resulting in the formation of a charged exciton. (see text).
PL spectra for a QD obtained at 4 K. The energies of the two lasers were 1.710 eV (red laser) and 2.331 eV (green laser). The red laser is circularly polarized (counterclockwise). The PL is resolved with circularly polarized elements. The laser powers are (a) , ; (b) , ; (c) , ; and (d) , .
(a) Circularly polarization resolved PLE spectra with two-color excitation. The laser powers are and . (b) Degree of circular polarization. The solid line is a guide for the eyes.
Energy diagram of spin initialization. Optical pumping with circularly polarized laser transfer electron to electron, resulting in a large population of electron.
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