Analysis of the N=4 Hubbard ring using a counting operator
arXiv:0811.3077 · doi:10.1016/j.physleta.2009.04.026
Abstract
We prove three theorems about the use of a counting operator to study the spectrum of model Hamiltonians. We analytically calculate the eigenvalues of the Hubbard ring with four lattice positions and apply our theorems to describe the observed level crossings.
reference added tot the work of Schumann, small corrections made
References in corpus (7)
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