From the Hubbard to the SO(5) Ladder: A Numerical Study
Abstract
The Hubbard Hamiltonian on a twoleg ladder is studied numerically using quantum Monte Carlo and Exact Diagonalization techniques. A rung interaction, $V$, is turned on such that the resulting model has an exact SO(5) symmetry when $V=U$. The evolution of the low energy excitation spectrum is presented from the pure Hubbard ladder to the SO(5) ladder. It is shown that the low energy excitations in the pure Hubbard ladder have an approximate SO(5) symmetry.
 Publication:

arXiv eprints
 Pub Date:
 April 1998
 DOI:
 10.48550/arXiv.condmat/9804221
 arXiv:
 arXiv:condmat/9804221
 Bibcode:
 1998cond.mat..4221D
 Keywords:

 Strongly Correlated Electrons
 EPrint:
 4 pages, Latex, 4 figures embedded in the text, minor changes