Exact Bond-Located Spin Ground State in the Hubbard Chain with Off-Diagonal Coulomb Interactions

Details Exact Bond-Located Spin Ground State in the Hubbard Chain with Off-Diagonal Coulomb Interactions Exact Bond-Located Spin Ground State in the Hubbard Chain with Off-Diagonal Coulomb Interactions

2001-02-27

arxiv.org/abs/cond-mat/0102497v1

J. Phys. Soc. Jpn. 70 (2001) 1202 (http://jpsj.jps.or.jp/journal/pdf/JPSJ-70-5/1202.pdf)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 eps figures

Scientific paper

10.1143/JPSJ.70.1202

We show the existence of an exact ground state in certain parameter regimes of one-dimensional half-filled extended Hubbard model with site-off-diagonal interactions. In this ground state, the bond-located spin correlation exhibits a long-range order. In the case when the spin space is SU(2) symmetric, this ground state degenerates with higher spin states including a fully ferromagnetic state. We also discuss the relation between the exact bond-ordered ground state and the critical bond-spin-density-wave phase.

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