DMRG analysis of the SDW-CDW crossover region in the 1D half-filled Hubbard-Holstein model

Details DMRG analysis of the SDW-CDW crossover region in the 1D half-filled Hubbard-Holstein model DMRG analysis of the SDW-CDW crossover region in the 1D half-filled Hubbard-Holstein model

2009-06-12

arxiv.org/abs/0906.2355v2

J. Phys.: Conf. Ser. 200, 01203 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

revised version

Scientific paper

10.1088/1742-6596/200/1/012031

In order to clarify the physics of the crossover from a spin-density-wave (SDW) Mott insulator to a charge-density-wave (CDW) Peierls insulator in one-dimensional (1D) systems, we investigate the Hubbard-Holstein Hamiltonian at half filling within a density matrix renormalisation group (DMRG) approach. Determining the spin and charge correlation exponents, the momentum distribution function, and various excitation gaps, we confirm that an intervening metallic phase expands the SDW-CDW transition in the weak-coupling regime.

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