Fast dynamics of molecular bridges

0386894 - FZÚ 2013 RIV SE eng J - Journal Article
Špička, Václav - Kalvová, Anděla - Velický, B.
Fast dynamics of molecular bridges.
Physica Scripta. T151, č. 1 (2012), s. 1-17. ISSN 0031-8949. E-ISSN 1402-4896
R&D Projects: GA ČR GAP204/12/0897
Institutional research plan: CEZ:AV0Z10100521; CEZ:AV0Z10100520
Keywords : time quantum dynamics * nonequilibrium Green-functions * Kadanoff-Baym equations * initial correlations * transportequations * mesoscopic systems
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 1.032, year: 2012

We address the dynamics of open quantum systems, when complex finite time initial conditions, an ensuing rapid nonequilibrium transient, quantum interferences and their attenuation play important roles. To study all these phenomena in conditions of general non-equilibrium, open systems are represented by a simple structure of a molecular island between two leads. We treat this model using the Nonequilibrium Greens Functions (NGF) method for a finite initial condition. We demonstrate that the non-interacting molecular bridge model captures well many features of general open quantum systems. Three stages of its nonequilibrium evolution, the first described by the full NGF description, the second, ruled by the asymptotically exact Generalized master equation (GME) and the third, governed by a Markovian master equation (ME), are delineated and related to each other.
Permanent Link: http://hdl.handle.net/11104/0216130