Photoinduced indirect transitions and ultrafast direct current generation in unbiased superlattices

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We theoretically analyze the electron dynamics in a superlattice (SL) driven by a highly asymmetric electromagnetic pulse. We show that the time asymmetry of the pulse results in indirect population of higher minibands and leads to the appearance of a direct current. At low temperatures and low filling of the lowest miniband the current generated in the SL has an oscillating behavior as a function of the pulse strength with minima occurring when the wave vector transferred by the pulse matches an integer of half the reciprocal lattice constant. (c) 2006 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2006-08
Language
English
Article Type
Article
Citation

PHYSICS LETTERS A, v.356, no.4-5, pp.255 - 261

ISSN
0375-9601
DOI
10.1016/j.physleta.2006.03.061
URI
http://hdl.handle.net/10203/261923
Appears in Collection
PH-Journal Papers(저널논문)
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