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TitlePolaron relaxation in a quantum dot due to anharmonic coupling within a mean-field approach
Author(s)Stauber, Tobias Pascal
Vasilevskiy, Mikhail
gallium arsenide
Gruneisen coefficient
III-V semiconductors
indium compounds
semiconductor quantum dots
thermal expansion
Issue date2009
PublisherAmerican Physical Society
JournalPhysical Review B: Condensed Matter and Materials Physics
Citation"Physical review B : condensed matter and materials physics". ISSN 1098-0121. 79 (2009) 113301.
Abstract(s)We study the electronic relaxation in a quantum dot within the polaron approach by focusing on the reversible anharmonic decay of longitudinal optical LO phonons forming the polaron into longitudinalacoustic LA phonons. The coherent coupling between the LO and LA phonons is treated within a mean-field approach.We derive a temperature-dependent interlevel coupling parameter, related to the Grüneisen parameter and the thermal-expansion coefficient, which characterizes an effective decay channel for the electronic or excitonic states. Within this theory, we obtain a characteristic anharmonic decay time of 1 ns, 2–3 orders of magnitude longer than previous predictions based on the Fermi’s Golden Rule. We suggest that coherent relaxation due to carrier-carrier interaction is an efficient alternative to the (too slow) polaron decay.
AccessOpen access
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)
CDF - FMNC - Artigos/Papers (with refereeing)

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