15 research outputs found
Effects of Nitrogen, Phosphorus and Potassium Fertilisers on the Dry Matter Yield and Chemical Composition of Amaranthus Hybridus
Choosing durable goods for household production: economic efficiency of household durables
Content- and medium-specific decomposition of friendship relational maintenance: Integrating equity and media multiplexity approaches
An Autonomous Crop Treatment Robot: Part I. A Kalman Filter Model for Localization and Crop/Weed Classification
Spinon and η -spinon correlation functions of the Hubbard chain
We calculate real-space static correlation functions of spin and charge degrees of freedom of the
one-dimensional Hubbard model that are described by operators related to singly occupied sites with spin
up or spin down (spinons) and unoccupied or doubly occupied sites ( η -spinons). The spatial decay of their
correlation functions is determined using density matrix renormalization group results. The nature and
spatial extent of the correlations between two sites on the Hubbard chain is studied using the eigenstates
and eigenvalues of the two-site reduced density matrix. The results show that the spinon-spinon correlation
functions decay algebraically and the η -spinon correlation functions decay exponentially, both in the half-
ïŹlling and metallic phases. The results provide evidence that these degrees of freedom are organized in
boundstates in the interacting system.Portuguese FCT both in the frame-
work of the Strategic Project PEST-C/FIS/UI607/2011 and
under SFRH/BSAB/1177 /201