Classical two-site fidelity and quantum phase transitions in the Ising model and the extended Hubbard model


Autoria(s): Li, YC
Data(s)

2008

Resumo

In this Letter, the classical two-site-ground-state fidelity (CTGF) is exploited to identify quantum phase transitions (QPTs) for the transverse field Ising model (TFIM) and the one-dimensional extended Hubbard model (EHM). Our results show that the CTGF exhibits an abrupt change around the regions of criticality and can be used to identify QPTs in spin and fermionic systems. The method is especially convenient when it is connected with the density-matrix renormalization group (DMRG) algorithm. (C) 2008 Elsevier B.V. All rights reserved.

National Natural Science Foundation of China 60521001 60776061This work was supported in part by the National Natural Science Foundation of China (Grants No. 60521001 and No. 60776061).

Identificador

http://ir.semi.ac.cn/handle/172111/6422

http://www.irgrid.ac.cn/handle/1471x/62949

Idioma(s)

英语

Fonte

Li, YC .Classical two-site fidelity and quantum phase transitions in the Ising model and the extended Hubbard model ,PHYSICS LETTERS A,2008 ,372(40): 6207-6211

Palavras-Chave #半导体物理 #STATISTICAL-MECHANICS #XY-MODEL #ENTANGLEMENT
Tipo

期刊论文