Excitation spectrum of Hubbard model with infinite electron repulsion on strip-type triangular lattices


Cheranovskii V., Ezerskaya E., Krikunov M.

INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, vol.81, no.4, pp.253-259, 2001 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 81 Issue: 4
  • Publication Date: 2001
  • Title of Journal : INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY
  • Page Numbers: pp.253-259

Abstract

The estimations of the stability region of the lattice ferromagnetic ground state in the space of model parameters are found. For the triangular lattice strip formed by L segments with the total number of electrons N = L + 1 we derived the effective Hamiltonians describing the low-energy states of the strips and obtained the analytical estimations for above stability region. The possibility of the magnetic transition with the jump of the ground-state spin between minimal and maximal values has also been shown. For the strip with N = L and an alternating value of the one-site potential energy, we have obtained the exact relation between electron parameters, which provides the ferromagnetic character of the lattice ground state. (C) 2001 John Wiley & Sons, Inc.