Electron motion in a Holstein molecular chain in an electric field |
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Authors: | V D Lakhno A N Korshunova |
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Institution: | (1) Institut für Angewandte Photophysik, Institut für Angewandte Photophysik, Dresden, 01062, Germany |
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Abstract: | A charge motion in an electric field in a Holstein molecular chain is modeled in the absence of dissipation. It is shown that
in a weak electric field a Holstein polaron moves uniformly experiencing small oscillations of its shape. These oscillations
are associated with the chain’s discreteness and caused by the presence of Peierls-Nabarro potential there. The critical value
of the electric field intensity at which the moving polaron starts oscillating at Bloch frequency is found. It is shown that
the polaron can demonstrate Bloch oscillations retaining its shape. It is also shown that a breathing mode of Bloch oscillations
can arise. In all cases the polaron motion along the chain is infinite. |
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Keywords: | |
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