Eur. Phys. J. B (2015) 88: 44
https://doi.org/10.1140/epjb/e2014-50426-4

Regular Article

Evolution of dimerized phase in a one-dimensional correlated electron system

School of Physical Science and Technology, Xinjiang University, Urumqi 830046, P.R. China

^a e-mail: zhjxjuchina@163.com

Received: 24 June 2014
Received in final form: 2 December 2014
Published online: 9 February 2015

Abstract

The one-dimensional half-filled correlated electron system with on-site (U), nearest-neighbor (V) and pair hopping (Y) repulsions is studied analytically at weak coupling, combined the Abelian bosonization with renormalization group methods. The corresponding ground-state phase diagram consists of three insulating phases, a charge-density-wave (CDW) phase for U − 2V< − 2Y, a spin-density-wave (SDW) phase for U − 2V> 2Y, and a bond-charge-density-wave (BOW) phase for | U − 2V | < 2Y. The pair hopping, which breaks an accident symmetry and splits the frustrating line U − 2V = 0, provides a possibility for the dimerized BOW phase between the CDW and SDW phases. In the phenomenological parameter regime, the superconducting (SC) and bond-spin-density-wave (BSDW) phases are briefly discussed.