Is there spin-charge separation in the 2D Hubbard and t-J models at low electronic densities?

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 $\mathrm{t}-\mathrm{J}$ 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 $\mathrm{t}-\mathrm{J}$ model.

11 pages, tex, 3 figures upon request, NTHU - preprint

Cited by in corpus (21)

• One-Dimensional Fermi liquids
• Phase Diagram and Pairing Symmetry of the Two-Dimensional t-J Model by a Variation Theory
• Static and Dynamical Properties of the Ferromagnetic Kondo Model with Direct Antiferromagnetic Coupling Between the localized $t_{2g}$ Electrons
• The Hubbard model within the equations of motion approach
• d_{x^2-y^2}-wave superconductivity and the Hubbard model
• Crossover from nonadiabatic to adiabatic electron transfer reactions: Multilevel blocking Monte Carlo simulations
• Magnetic Domains and Stripes in the Spin-Fermion Model for Cuprates
• Path-integral Monte-Carlo simulations for electronic dynamics on molecular chains: I. Sequential hopping and super exchange
• Algorithmic approach to diagrammatic expansions for real-frequency evaluation of susceptibility functions
• Two-Dimensional t-J Model at Low Electron Density
• Collective modes in the paramagnetic phase of the Hubbard model
• Bosonic sector of the two-dimensional Hubbard model studied within a two-pole approximation
• t-J model Studied by the New Lanczos-Power Method
• The Composite Operator Method (COM)
• Anomalous spin-charge separation in a driven Hubbard system
• Spin and charge dynamics of the t-J model at intermediate electron densities: absence of spin-charge separation
• Study of Spin and Charge Fluctuations in the U-t-t' Model
• Fermi Surface Reconstruction by Dynamic Magnetic Fluctuations and Spin-Charge Separation Near an O(3) Quantum Critical Point
• Disorder-induced spin-charge separation in the 1-D Hubbard model
• The fate of pairing and spin-charge separation in the presence of long-range antiferromagnetism
• Impurity-induced magnetization in three dimensional antiferromagnet at quantum critical point