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Spin waves in the 2D Hubbard model beyond the RPA

✍ Scribed by P.J.H. Denteneer; J.M.J. van Leeuwen

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
157 KB
Volume
199-200
Category
Article
ISSN
0921-4526

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✦ Synopsis

The spin-wave velocity c for the repulsive Hubbard model on a square lattice at half-filling is calculated as the square root of spin stiffness over perpendicular susceptibility using the variational Monte Carlo method with Gutzwiller wave function. For 3 < U/t < 12, c increases by 34--15% compared to the RPA result.

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