Energy spectrum of the Hubbard model with U=∞

Adolfo Avella, S. Krivenko, Francesco Paolo Mancini +1 more

Yuliya V. Mikhailova

L. Didukh

Силантьев Анатолий Владимирович

Anticommutator Green functions and the dimer energy spectrum in Hubbard model and the hydrogen molecule energy spectrum in Hubbard model are calculated in the approximation of statical fluctuations.

Sadulla Mamarazhabovich Tashpulatov, R. T. Parmanova

We consider an energy operator of four-electron system in the Impurity Hubbard model with a coupling between nearest-neighbors. The spectrum of the systems in the second triplet state in a ν-dimensional lattice is investigated. For investigation the structure of essential spectra and discrete spectrum of the energy operator of four-electron systems in an impurity Hubbard model, for which the momentum representation is convenient. In addition, we used the tensor products of Hilbert spaces and tensor products of operators in Hilbert spaces and described the structure of essential spectrum and discrete spectrum of the energy operator of four-electron systems in an impurity Hubbard model for the second triplet state of the system. The investigations show that the essential spectrum of the system consists of the union of no more than sixteen segments, and the discrete spectrum of the system consists of no more than eleven eigenvalues.

Tsutomu Momoi