Evolution of the low-energy excitation spectrum from the pure Hubbard ladder to the SO(5) ladder: A numerical study

Journal Article · Tue Sep 01 04:00:00 EDT 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.58.R5932· OSTI ID:641654

Duffy, D ^[1]; Haas, S ^[2]; Kim, E ^[1]

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1. Department of Physics, University of California, Santa Barbara, California 93106 (United States)
2. Theoretische Physik, ETH-Hoenggerberg, CH-8093 Zurich (Switzerland)

The Hubbard Hamiltonian on a two-leg 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={minus}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. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 641654
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 58; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
EXCITATION
HAMILTONIANS
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
MONTE CARLO METHOD
NUMERICAL SOLUTION