Linearized antiferromagnetic spin-wave spectra around a hole in the two-dimensional Hubbard model

Journal Article · Thu Aug 01 00:00:00 EDT 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.2609· OSTI ID:5183355

Choi, H ^[1]

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1. Xerox Webster Research Center, 800 Phillips Road, 0114-39D, Webster, New York (USA)

We study the effects of doping on the spin fluctuations of the two-dimensional Hubbard model. Within a harmonic approximation we calculate the linearized antiferromagnetic spin-wave spectra around a hole away from half-filling, which takes the form of a spin polaron in a mean-field approximation. The presence of the spin polaron breaks a symmetry of the problem, the product of time reversal and lattice translation. As a result, the double degeneracy of the magnon spectra of the Neel state is lifted. There also appear localized magnon modes depending on the ratio {ital U}/{ital t} of the Hubbard model. The quantum correction due to the spin fluctuations is found to increase the spin polaron binding energy for {ital U}/{ital t}{lt}13, but decreases it for {ital U}/{ital t}{gt}13.

• OSTI ID: 5183355
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 44:6; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
HIGH-TC SUPERCONDUCTORS
MAGNONS
MATHEMATICAL MODELS
ANTIFERROMAGNETISM
BINDING ENERGY
FLUCTUATIONS
POLARONS
SPIN WAVES
SYMMETRY BREAKING
TWO-DIMENSIONAL CALCULATIONS
ENERGY
MAGNETISM
QUASI PARTICLES
SUPERCONDUCTORS
VARIATIONS
656100* - Condensed Matter Physics- Superconductivity