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Phonon affected transport through molecular quantum
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SYSNO ASEP 0332243 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Phonon affected transport through molecular quantum Title Vliv fononů na transport molekulární "kvantovou tečkou" Author(s) Loos, Jan (FZU-D) RID
Koch, T. (DE)
Alvermann, A. (DE)
Bishop, A. R. (US)
Fehske, H. (DE)Source Title Journal of Physics-Condensed Matter. - : Institute of Physics Publishing - ISSN 0953-8984
Roč. 21, č. 39 (2009), 395601/1-395601/18Number of pages 18 s. Language eng - English Country GB - United Kingdom Keywords quantum dots ; electron - phonon interaction ; polarons Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000269626500011 DOI 10.1088/0953-8984/21/39/395601 Annotation To describe the interaction of molecular vibrations with electrons at a quantum dot contacted to metallic leads, we extend an analytical approach we previously developed for the many-polaron problem. Our scheme is based on an incomplete variational Lang-Firsov transformation, combined with a perturbative calculation of the electron-phonon self-energy in the framework of generalized Matsubara functions. This allows us to describe the system at weak-to-strong coupling and intermediate-to-large phonon frequencies. We present results for the quantum dot spectral function and for the kinetic coefficient that characterizes the electron transport through the dot. We critically examine the strengths and limitations of our approach, and discuss the properties of the molecular quantum dot in the context of polaron physics. We place particular emphasis on the importance of corrections to the concept of an anti-adiabatic dot polaron suggested by the complete Lang-Firsov transformation. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2010
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