We introduce an atomistic approach to the dissipative quantum dynamics of charged or neutral excitations propagating through macromolecular systems. Using the Feynman-Vernon path integral formalism, we analytically trace out from the density matrix the atomic coordinates and the heat bath degrees of freedom. This way we obtain an effective field theory which describes the real-time evolution of the quantum excitation and is fully consistent with the fluctuation-dissipation relation. Themain advantage of the field-theoretic approach is that it allows us to avoid using the Keldysh contour formulation. This simplification makes it straightforward to derive Feynman diagrams to analytically compute the effects of the interaction of the propagating quantum excitation with the heat bath and with the molecular atomic vibrations. For illustration purposes, we apply this formalism to investigate the loss of quantum coherence of holes propagating through a poly(3-alkylthiophene) polymer.
Scheda prodotto non validato
I dati visualizzati non sono stati ancora sottoposti a validazione formale da parte dello Staff di IRIS, ma sono stati ugualmente trasmessi al Sito Docente Cineca (Loginmiur).
Titolo: | Dissipative quantum transport in macromolecules: Effective field theory approach | |
Autori: | Schneider, Elia; Silvio a., Beccara; Faccioli, Pietro | |
Autori Unitn: | ||
Titolo del periodico: | PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS | |
Anno di pubblicazione: | 2013 | |
Codice identificativo Scopus: | 2-s2.0-84884555583 | |
Codice identificativo WOS: | WOS:000323572000003 | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1103/PhysRevB.88.085428 | |
Handle: | http://hdl.handle.net/11572/34649 | |
Appare nelle tipologie: | 03.1 Articolo su rivista (Journal article) |