Eur. Phys. J. B (2016) 89: 212
https://doi.org/10.1140/epjb/e2016-70361-6

Regular Article

Density matrix spectra and order parameters in the 1D extended Hubbard model

¹ Department of Physics and ITP, The Chinese University of Hong Kong, Hong Kong, P.R. China
² Beijing Computational Science Research Center, Beijing 100084, P.R. China

^a e-mail: wcyu.physics@gmail.com

Received: 7 June 2016
Received in final form: 12 July 2016
Published online: 3 October 2016

Abstract

Without any knowledge of the symmetry existing in a system, we derive the exact forms of the order parameters which show long-range correlations in the ground state of the one-dimensional (1D) extended Hubbard model using a quantum information approach. Our work demonstrates that the quantum information approach can help us to find the explicit form of the order parameter, which could not be derived systematically via traditional methods in the condensed matter theory.