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A dimerized spin fluid in a one-dimensional electron system | | Y. Z. Zhang
; C. Q. Wu
; H. Q.Lin
; | | Date: |
6 Sep 2001 | | Journal: | Phys. Rev. B Vol. 65 115101 (2002) | | Subject: | Strongly Correlated Electrons | cond-mat.str-el | | Affiliation: | 1 and 2), C. Q. Wu , and H. Q.Lin (Research Center for Theoretical Physics, Fudan University, Shanghai, China,Surface Physics Laboratory, Fudan University, Shanghai, China,Department of Physics, The Chinese University of Hong Kong, Hong Kong, China | | Abstract: | The ground state of a one-dimensional Hubbard model with a bond-charge attraction W term at half-filling is investigated by the density matrix renormalization group method. It is confirmed that the spin gap will be closed at U>8W. But the long-range bond order wave survives even when the spin gap is closed. It indicates that the ground state is a novel dimerized spin fluid at U>8W. By a charge-spin transformation, it is shown that there should be a dimerized metallic phase at U<-8W. Furthermore, it is found that the Hubbard interaction U enhances initially the dimerization for a weak bond charge attraction W whereas it reduces monotonously the dimerization for a stronger bond charge attraction W. | | Source: | arXiv, cond-mat/0109101 | | Services: | Forum | Review | PDF | Favorites | |
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