Spin-charge separation in the two-dimensional Hubbard and t-J models at low electronic density

Files
Note (246.64 KB)
Downloads: 679
TR Number
Date
1994-07
Journal Title
Journal ISSN
Volume Title
Publisher
American Physical Society
Abstract

The spin- and density-correlation functions of the two-dimensional Hubbard model at low electronic density [n] are calculated in the ground state by using the power method, and at finite temperatures by using the quantum Monte Carlo technique. Both approaches produce similar results, which are in close agreement with numerical and high-temperature-expansion results for the two-dimensional t-J model. Using perturbative approximations, we show that the examination of the density-correlation function alone is not enough to support recent claims in the literature that suggested spin and charge separation in the low electronic density regime of the t-J model.

Description
Keywords
luttinger-liquid, phase-diagram, state, behavior, physics, condensed matter
Citation
Chen, Y. C.; Moreo, A.; Ortolani, F.; Dagotto, E.; Lee, T. K., "Spin-charge separation in the two-dimensional Hubbard and t-J models at low electronic density," Phys. Rev. B 50, 655(R) DOI: http://dx.doi.org/10.1103/PhysRevB.50.655