Interaction versus dimerization in one-dimensional Fermi systems |
| |
Authors: | C Schuster U Eckern |
| |
Institution: | Institut für Physik, Universit?t Augsburg, 86135 Augsburg, Germany, DE
|
| |
Abstract: | In order to study the effect of interaction and lattice distortion on quantum coherence in one-dimensional Fermi systems,
we calculate the ground state energy and the phase sensitivity of a ring of interacting spinless fermions on a dimerized lattice.
Our numerical DMRG studies, in which we keep up to 1000 states for systems of about 100 sites, are supplemented by analytical
considerations using bosonization techniques. We find a delocalized phase for an attractive interaction, which differs from
that obtained for random lattice distortions. The extension of this delocalized phase depends strongly on the dimerization
induced modification of the interaction. Taking into account the harmonic lattice energy, we find a dimerized ground state
for a repulsive interaction only. The dimerization is suppressed at half filling, when the correlation gap becomes large.
Received: 11 February 1998 / Revised: 1st April 1998 / Accepted: 30 April 1998 |
| |
Keywords: | PACS 71 10 -w Theories and models of many electron systems - 75 10 Jm Quantized spin models |
本文献已被 SpringerLink 等数据库收录! |
|