TY - JOUR
T1 - Nonlocal electron-phonon coupling: influence on the nature of polarons
AU - Stojanovic, V.M.
AU - Bobbert, P.A.
AU - Michels, M.A.J.
PY - 2004
Y1 - 2004
N2 - We present a variational approach to an extended Holstein model, comprising both local and nonlocal electron-phonon coupling. The approach is based on the minimization of a Bogoliubov bound to the free energy of the coupled electron-phonon system, and is implemented for a one-dimensional nearest-neighbor model, with Einstein phonons. The ambivalent character of nonlocal coupling, which both promotes and hinders transport, is clearly observed. A salient feature of our results is that the local and nonlocal couplings can compensate each other, leading to a supression of polaronic effects.
AB - We present a variational approach to an extended Holstein model, comprising both local and nonlocal electron-phonon coupling. The approach is based on the minimization of a Bogoliubov bound to the free energy of the coupled electron-phonon system, and is implemented for a one-dimensional nearest-neighbor model, with Einstein phonons. The ambivalent character of nonlocal coupling, which both promotes and hinders transport, is clearly observed. A salient feature of our results is that the local and nonlocal couplings can compensate each other, leading to a supression of polaronic effects.
U2 - 10.1002/pssc.200303645
DO - 10.1002/pssc.200303645
M3 - Article
SN - 1610-1634
VL - 1
SP - 172
EP - 175
JO - Physica Status Solidi C: Conferences
JF - Physica Status Solidi C: Conferences
IS - 1
ER -