Electronic Resource
Springer
The European physical journal
94 (1994), S. 335-339
ISSN:
1434-6036
Keywords:
74.20.-Z
;
75.10.Jm
;
75.50.Ee
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We calculate the ground state of the half-filled Hubbard model and its energy by starting from a spindensity wave approximation and improving it by incorporating transverse spin fluctuations. The calculations are done by employing a projection method. The quality of the proposed approximation is particularly high for intermediate and large Coulomb repulsionU, where it exceeds considerably e.g. that of the Gutzwiller projected spin-density wave state. To ordert 2/U (wheret is the hopping matrix element), our approximation is shown to be equivalent to a recent Coupled Cluster calculation for the Heisenberg antiferromagnet. Finally we show how to ordert 2/U the linear spin-wave approximation for the Heisenberg antiferromagnet may be obtained.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01320687
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