1 2 Fe b 20 09 Analysis of the N = 4 Hubbard ring using counting operators
نویسندگان
چکیده
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.
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تاریخ انتشار 2009