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
复制标题
一维半填充 Hubbard-Holstein 模型中 SDW-CDW 交叉区域的 DMRG 分析
DOI:
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发表时间:
2009
期刊:
影响因子:
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通讯作者:
H. Fehske
中科院分区:
文献类型:
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作者:
S. Ejima;H. Fehske
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.