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Abstract
We have investigated the anticrossings of Wannier-Stark levels at low electric fields in a superlattice with wide quantum wells by photocurrent spectroscopy. The measurements were performed at low temperatures in electric and magnetic fields parallel to the growth direction. The diamagnetic shift of the excitonic Wannier-Stark levels was measured for constant electric fields smaller and higher than the resonance electric field. By comparing the diamagnetic shift of the various transitions, the character of the states involved in the anticrossing was determined and the interchange of the states during the low-field anticrossing could be verified. Furthermore, the interwell-to-intrawell ratio of the diamagnetic shift is compared to theoretical calculations of the exciton radius.
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