| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1865752 | Physics Letters A | 2009 | 5 Pages |
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.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Physics and Astronomy (General)
Authors
Tobias Verhulst, Ben Anthonis, Jan Naudts,