Transport of Polarons in Graphene Nanoribbons.
The field-induced dynamics of polarons in armchair graphene nanoribbons (GNRs) is theoretically investigated in the framework of a two-dimensional tight-binding model with lattice relaxation. Our findings show that the semiconductor behavior, fundamental to polaron transport to take place, depends upon of a suitable balance between the GNR width and the electron-phonon (e-ph) coupling strength. In a similar way, we found that the parameter space for which the polaron is dynamically stable is limited to an even narrower region of the GNR width and the e-ph coupling strength. Interestingly, the interplay between the external electric field and the e-ph coupling plays the role to define a phase transition from subsonic to supersonic velocities for polarons in GNRs.
†Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden.
Luiz Antonio
LA
Ribeiro
‡Institute of Physics, University of Brasilia, 70.919-970 Brasilia, Brazil.
Wiliam Ferreira
WF
da Cunha
‡Institute of Physics, University of Brasilia, 70.919-970 Brasilia, Brazil.
Antonio Luciano de Almeida
AL
Fonseca
‡Institute of Physics, University of Brasilia, 70.919-970 Brasilia, Brazil.
Geraldo Magela
GM
e Silva
†Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden.
Sven
S
Stafström
Su−Schrieffer−Heeger Model; charge transport; graphene nanoribbons; organic semiconductors; polarons