Photocurrent and charge density

GaAs(110) Asymmetry in photocurrent and charge density Photocurrent for Ein = -0.75 eV and k|| = 0.6 Å-1 and charge density: (a) measured (dark blue) and calculated (green) current with radius representing the intensity in the polar plot; (b)+(c) contour plots of the charge density for k|| belonging to the lower left lobe in the current, with cuts in the xy plane (b) and the yz plane (c). The position of these cuts are indicated by the line in the other figure, respectively.   Photocurrent as Fourier transform? For simple initial states and with plane waves as approximation for the final states, the angular distribution of the photocurrent can be identified with that of the charge Fourier transform.     Photocurrent Polar plot of the photocurrent for Ein = -4.0 eV, calculated with a full final state (purple red) and a free final plane wave (dark green). In general, with nontrivial initial and full final states, the simple direct relation between charge and photocurrent is not valid. The angular distribution of the photocurrent is strongly influenced by the final states.   Spatial density modulates the angular distribution of intensities. A trivial interpretation based only on the initial state is not possible.

Claus-Henning Solterbeck, for references see here.

CAU Kiel

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30.5.1998