Session H38: Focus Session: Theory of Electron Transport Through Molecules I
8:00 AM–10:48 AM, Tuesday, March 17, 2009
Room: 410
Sponsoring Unit:
DCP
Chair: Matthias Ernzerhof, Université de Montréal
Abstract ID: BAPS.2009.MAR.H38.4
Abstract: H38.00004 : Model \textit{ab initio} studies of solvation and excess charge localization on conjugated carbon chains
9:24 AM–9:36 AM
Preview Abstract
MathJax On | Off 
Abstract 
Authors:
Michael Mayo
(The University of Texas at Dallas)
Yuri Gartstein
(The University of Texas at Dallas)
Using long C$_N$H$_2$ conjugated carbon chains with the polyynic structure as prototypical examples of one-dimensional (1D) semiconductors, we discuss self-localization of excess charge carriers in the presence of the interaction with a surrounding polar solvent. The solvation mechanism of self-trapping is different from the self-localization due to coupling with bond-length modulations of the underlying atomic lattice well-known in conjugated polymers. Model \textit{ab initio} computations are carried out and compared that employ various methods such as hybrid density functionals and Hartree-Fock within the framework of the polarizable continuum model. We demonstrate the possibility of the formation of large 1D electron- and hole-polarons entirely due to solvation, but even larger degrees of charge localization occur when accompanied by atomic displacements. Also discussed are doubly-charged bipolaron states and topological kink-solitons that may be formed in these systems. For a brief report, see M.~L.~Mayo and Yu.~N.~Gartstein, Phys. Rev. B 78, 073402 (2008).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2009.MAR.H38.4