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Nonequilibrium transport through molecular junctions in the quantum regime
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SYSNO ASEP 0365033 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Nonequilibrium transport through molecular junctions in the quantum regime Author(s) Koch, T. (DE)
Loos, Jan (FZU-D) RID
Alvermann, A. (GB)
Fehske, H. (DE)Source Title Physical Review. B - ISSN 1098-0121
Roč. 84, č. 12 (2011), 125131/1-125131/16Number of pages 16 s. Language eng - English Country US - United States Keywords theory of electronic transport ; scattering mechanisms ; polarons and electron-phonon interactions ; quantum dots Subject RIV BM - Solid Matter Physics ; Magnetism CEZ AV0Z10100521 - FZU-D (2005-2011) UT WOS 000298991300001 DOI 10.1103/PhysRevB.84.125131 Annotation We consider a quantum dot, affected by a local vibrational mode and contacted to macroscopic leads, in the nonequilibrium steady-state regime. We apply a variational Lang-Firsov transformation and solve the equations of motion of the Green functions in the Kadanoff-Baym formalism up to a second order in the interaction coefficients. The variational determination of the transformation parameter through minimization of the thermodynamic potential allows us to calculate the electron/polaron spectral function and conductance for adiabatic to antiadiabatic phonon frequencies and weak to strong electron-phonon couplings. We investigate the qualitative impact of the quasiparticle renormalization on the inelastic electron tunneling spectroscopy signatures and discuss the possibility of a polaron induced negative differential conductance. In the high-voltage regime,we find that the polaron level follows the lead chemical potential to enhance resonant transport. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2012
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