Phase diagram of the Hubbard chain with two atoms per cell

Details Phase diagram of the Hubbard chain with two atoms per cell Phase diagram of the Hubbard chain with two atoms per cell

2001-07-11

arxiv.org/abs/cond-mat/0107222v1

Phys. Rev. B 64, 121105(R) (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages including 2 figures To be published in Phys. Rev. B (Rapid Communications)

Scientific paper

10.1103/PhysRevB.64.121105

We obtain the quantum phase diagram of the Hubbard chain with alternating on-site energy at half filling. The model is relevant for the ferroelectric perovskites and organic mixed-stack donor-acceptor crystals. For any values of the parameters, the band insulator is separated from the Mott insulator by a dimer phase. The boundaries are determined accurately by crossing of excited levels with particular discrete symmetries. We show that these crossings coincide with jumps of charge and spin Berry phases with a clear geometrical meaning.

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