Phonon-affected steady-state transport through molecular quantum dots

0386647 - FZÚ 2013 RIV SE eng J - Journal Article
Koch, T. - Fehske, H. - Loos, Jan
Phonon-affected steady-state transport through molecular quantum dots.
Physica Scripta. T151, č. 1 (2012), 1-10. ISSN 0031-8949. E-ISSN 1402-4896
Institutional research plan: CEZ:AV0Z10100521
Keywords : theory of electronic transport * scattering mechanisms * polarons and electron-phonon interactions
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.032, year: 2012

We consider the transport through a vibrating molecular quantum dot contacted to macroscopic leads acting as charge reservoirs. In the equilibrium and nonequilibrium regimes,we study the formation of a polaron-like transient state at the quantum dot for all the ratios of the dot–lead coupling to the energy of the local phonon mode. We show that the polaronic renormalization of the dot–lead coupling is a possible mechanism for negative differential conductance. Moreover, the effective dot level follows one of the lead chemical potentials to enhance resonant transport, causing novel features in the inelastic tunneling signal. In the linear response regime, we investigate the impact of the electron–phonon interaction on the thermoelectrical properties of the quantum dot device.
Permanent Link: http://hdl.handle.net/11104/0215936