One-dimensional extended Hubbard model with spin-triplet pairing ground states
Abstract
We show that the one-dimensional extended Hubbard model has saturated ferromagnetic ground states with the spin-triplet electron pair condensation in a certain range of parameters. The ground state wave functions with fixed electron numbers are explicitly obtained. We also construct two ground states in which both the spin-rotation and the gauge symmetries are broken, and show that these states are transferred from one to the other by applying the edge operators. The edge operators are reduced to the Majorana fermions in a special case. These symmetry breaking ground states are shown to be stabilized by a superconducting mean field Hamiltonian which is related to the Kitaev chain with the charge-charge interaction.
Keywords
Cite
@article{arxiv.1503.08998,
title = {One-dimensional extended Hubbard model with spin-triplet pairing ground states},
author = {Akinori Tanaka},
journal= {arXiv preprint arXiv:1503.08998},
year = {2016}
}
Comments
Version 2, a new section has been added, Some changes have been made, typos are fixed; Version3, 21 pages, some changes have been made, discussion is added in Section 6, two appendices are added;Version4, 23 pages, discussions are added in Sections 2 and 3, one reference is added