Alejandro Cabo, Francisco Claro, Alejandro Perez
Published 2001-11-27, updated 2001-12-06Version 2
The CDW Hartree-Fock state at half filling and half electron per unit cell is examined. Firstly, an exact solution in terms of Bloch-like states is presented. Using this solution we discuss the dynamics near half filling and show the mass to diverge logarithmically as this filling is approached. We also show how a uniform density state may be constructed from a linear combination of two degenerate solutions. Finally we show the second order correction to the energy to be an order of magnitude larger than that for competing CDW solutions with one electron per unit cell.
Comments: 14 pages, no figures, extended acknowledgements, two new references included
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