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Magnetism in the Hubbard model: An effective spin Hamiltonian approach

Abstract:

We present an approach to the magnetic properties of the half-filled Hubbard model, based on an approximate mapping of its low-energy transverse spin excitations on to those of an effective underlying Heisenberg model, but with effective spin interactions which are self-consistently determined and not confined solely to nearest-neighbor couplings. The mapping is exact in strong-coupling and is found to be accurate over a very wide range of interaction strengths, down to weak coupling. At zero...

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Publication status:
Published

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Publisher copy:
10.1103/PhysRevB.53.5505

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Institution:
University of Oxford
Division:
MPLS
Department:
Chemistry
Sub department:
Physical & Theoretical Chem
Role:
Author
Journal:
Physical Review B
Volume:
53
Issue:
9
Pages:
5505-5517
Publication date:
1996-03-01
DOI:
EISSN:
1095-3795
ISSN:
0163-1829
Source identifiers:
45063
Language:
English
Pubs id:
pubs:45063
UUID:
uuid:058d001e-2693-4460-8523-3dd0a0d89fe9
Local pid:
pubs:45063
Deposit date:
2012-12-19

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