Abstract
AbstractWe have systematically investigated the wave‐packet dynamics of Bloch oscillations (BOs) from the viewpoint of the characteristics of the Wannier‐Stark (WS) localization states in a GaAs (6.8 nm)/AlAs (0.9 nm) superlattice embedded in a p ‐i ‐n diode structure. The coherent oscillations were detected with a reflection‐type pump‐probe technique. It is clearly confirmed that the unusual BO with the frequency of 2eFD/h occurs in a weak localization regime in addition to the usual BO with eFD/h in a strong localization regime, where F is the applied electric field, and D is the superlattice period. The systematic results of the pump‐probe measurements as a function of pump energy indicate that the intensity of the unusual BO is drastically changed with pump energy, while a gradual change of that of the usual BO is observed. These results demonstrate that the quantum interference leading to the unusual BO with 2eFD/h is much sensitive to the pump energy compared with that of the usual BO. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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