Finite-size effects and unsaturated ferromagnetism of two-component Hubbard rings in a strong magnetic field: Exact results

Journal Article · Wed May 01 04:00:00 EDT 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.12804· OSTI ID:284355

Kocharian, A N ^[1]; Sebold, J H ^[2]

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1. Physics Department, Union College, Schenectady, New York 12308 (United States)
2. Physics Department, New York University, 4 Washington Place, New York, New York 10003 (United States)

We consider two-component Hubbard models in a strong magnetic field to reveal finite-size effects in the stability of the fully polarized state against one- and two-spin flips. Also established are the criteria for unsaturated ferromagnetism, with {ital S}{sub max} and {ital S}{sup {ital z}} reduced, depending on the relative signs of hopping parameters. The behavior of the critical field for periodic chains with arbitrary length at half filling is driven by Coulomb interaction, lattice frustration, and crucially band curvature. Unsaturated ferromagnetism, reminiscent of Nagaoka-like behavior, and the influence of spin liquid states are examined in the structure of off-diagonal spin correlations at large {ital U}. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 284355
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BAND THEORY
CRITICAL FIELD
FERROMAGNETISM
HUBBARD MODEL
SIZE
SPIN ORIENTATION
SUPERCONDUCTIVITY