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A one-to-two dimensional mapping using a partial fast Fourier transform
Stellan Ostlund
It will be shown how to map a simple one-dimensional tight binding model with a cosine potential in one dimension exactly to a two dimensional tight binding model with periodic bou…
Exact Transformation for Spin-Charge Separation of Spin-half Fermions without Constraints
Stellan Ostlund, Mats Granath
We demonstrate an exact local transformation which maps a purely Fermionic manybody system to a system of spinfull Bosons and spinless Fermions, demonstrating a possible path to a…
Properties of the doped spin 3/2 Mott insulator near half filling
Stellan Ostlund, A. Karlhede, T. H. Hansson
We develop an exact generalized Bogoliubov transformation for the spin 3/2 Hubbard model with large anti-Hunds rule coupling near half filling. Since our transformation is unitary,…
The degenerate 3-band Hubbard model with "anti-Hund's rule" interactions; a model for AxC60
M. Granath, S. Ostlund
We consider the orbitally degenerate 3-band Hubbard model with on-site interactions which favor low spin and low orbital angular momentum using standard second order perturbation t…