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(Color online) Microscopic picture describing the origin of spin current. The red arrows are the transitions from heavy holes to electrons, whereas the green arrows are the transitions from heavy holes to electrons. Both and cause unbalanced occupation in momentum space resulting in an electric current in real space.
(Color online) Photocurrent in (0001)-grown superlattices normalized by the radiation power as a function of phase angle . The measurements are obtained at room temperature for oblique incidence by He–Cd laser at the wavelength of . The blue line is fitted using Eq. (2) which is a combination of the CPGE, LPGE, and photovoltaic effect. The green-dash and red-dot lines show the oscillation current proportional to and , respectively. The inset diagram shows the simple geometry of the experiment.
(Color online) Photoinduced CPGE and LPGE currents in superlattices normalized by the light power at different incident angles .
(Color online) Temperature dependence of the photocurrents for the CPGE and LPGE in (0001)-grown superlattices. The measurements are obtained for oblique incidence by laser.
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