On the Hubbard model in the limit of vanishing interaction
Abstract
We address the question how a correspondence between particlelike excitations in the onedimensional Hubbard model (i.e. “holons” and “spinons”) and the free fermionic picture can be established in the limit of vanishing interaction by studying the finite size spectrum in the framework of the Bethe ansatz. Special attention has to be paid to the case of a vanishing magnetic field where the two bands of excitations in either description are degenerate. The interaction lifts this degeneracy.
 Publication:

Physics Letters A
 Pub Date:
 February 1995
 DOI:
 10.1016/03759601(95)00499S
 arXiv:
 arXiv:condmat/9505146
 Bibcode:
 1995PhLA..204..347F
 Keywords:

 PACS: 71.27.+A;
 75.10.LP;
 05.70.JK;
 Condensed Matter
 EPrint:
 10 pages, LaTeX, 2 uuencoded epsfigures