Bosonic mean-field theory of the spiral phases of Heisenberg antiferromagnets on a chain

Journal Article · Mon Nov 01 00:00:00 EST 1993 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.48.12763· OSTI ID:5990864

Rao, S ^[1]; Sen, D ^[2]

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1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay 400005 (India)
2. Centre for Theoretical Studies, Indian Institute of Science, Bangalore 560012 (India)

We develop a bosonic mean-field theory to describe the spiral phases of a Heisenberg antiferromagnet on a one-dimensional chain, in terms of three bosons at each site. The ground state is disordered, and for large values of the spin [ital S], two different and exponentially small energy gaps are found. The spin-spin correlation function is computed and is shown to decay exponentially at large distances. Our mean-field theory is also shown to be exact in a large-[ital N] generalization.

• OSTI ID: 5990864
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 48:17; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANTIFERROMAGNETISM
HEISENBERG MODEL
BOSONS
ENERGY GAP
GROUND STATES
HIGH-TC SUPERCONDUCTORS
MEAN-FIELD THEORY
ONE-DIMENSIONAL CALCULATIONS
CRYSTAL MODELS
ENERGY LEVELS
MAGNETISM
MATHEMATICAL MODELS
SUPERCONDUCTORS
665400* - Quantum Physics Aspects of Condensed Matter- (1992-)