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
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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
H. Fehske
中科院分区:
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文献类型:
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作者:
S. Ejima;H. Fehske

文献摘要

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为了阐明一维(1D)系统中自旋密度波(SDW)Mott绝缘体到电荷密度波(CDW)Peierls绝缘体的交叉物理,我们采用密度矩阵重整化群(DMRG)方法研究了半填充时的Hubbard-Holstein哈密顿量.确定的自旋和电荷相关指数,动量分布函数,和各种激发间隙,我们确认,一个介入的金属相扩展的SDW-CDW过渡在弱耦合制度。
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.