Schematic of the electronic bandstructure in the presence of a large electric field F. Due to reflection at the inclined conduction band edge states in the conduction band establish a phase correlation in energy in the location of the interband transition indicated by the red line (Franz-Keldysh oscillations). Below the band gap energy evanescent waves contribute at an exponentially decaying rate controlled by the tunneling probability given by the area of the lower shaded triangle (Franz-Keldysh effect).
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