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Signature of Bloch oscillations in a superlattice. (Left) FWM signal measured from a 40-period superlattice. The oscillations of the FWM signal follow the Bloch formula τBO = h/eFd. (Right) Variation of the Bloch oscillation frequency h/τBO, of two superlattices, d = 12.8 nm and d = 8.4 nm, as a function of the applied electric field F and for two temperatures (8).
