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Wannier–Stark level anticrossing in biperiodic superlattices
Author(s) -
Coquelin M.,
Pacher C.,
Kast M.,
Strasser G.,
Gornik E.
Publication year - 2006
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200642246
Subject(s) - superlattice , condensed matter physics , stark effect , physics , phonon , electric field , spectroscopy , field (mathematics) , transmission (telecommunications) , quantum mechanics , telecommunications , mathematics , computer science , pure mathematics
The complex interplay of coherent and incoherent transmission channels in biased biperiodic superlattices is studied utilizing hot‐electron spectroscopy. It is found that coherent transport through the superlattices is dominated by the progressive localization of the Wannier–Stark states of two subminibands. This electric field dependence is lifted at special superlattice bias conditions where anticrossings between the Wannier‐Stark states of neighboring subminibands are induced. Additionally, LO‐phonon mediated transmission channels open up at electric fields where the Wannier–Stark splitting between individual states exceeds the LO‐phonon energy. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)