Physics – Condensed Matter
Scientific paper
1996-08-24
Physics
Condensed Matter
REVTeX 3.0, 27 pages. 7 figures available upon request (koba@cc.it-chiba.ac.jp). To be published in Phys. Rev. B 54
Scientific paper
10.1103/PhysRevB.54.13129
The one-dimensional t-J model is investigated by the variational Monte Carlo method. A variational wave function based on the Bethe ansatz solution is newly proposed, where the spin-charge separation is realized, and a long-range correlation factor of Jastrow-type is included. In most regions of the phase diagram, this wave function provides an excellent description of the ground-state properties characterized as a Tomonaga-Luttinger liquid; Both of the amplitude and exponent of correlation functions are correctly reproduced. For the spin-gap phase, another trial state of correlated singlet pairs with a Jastrow factor is introduced. This wave function shows generalized Luther-Emery liquid behavior, exhibiting enhanced superconducting correlations and exponential decay of the spin correlation function. Using these two variational wave functions, the whole phase diagram is determined. In addition, relations between the correlation exponent and variational parameters in the trial functions are derived.
Iguchi Kaoru
Kobayashi Kenji
Ohe Chikaomi
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