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arXiv 1111.6148cond-mat.str-elcond-mat.supr-con
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一维Hubbard-Holstein模型中的关联单重相

Correlated singlet phase in the one-dimensional Hubbard-Holstein model

Sahinur Reja, Sudhakar Yarlagadda, Peter B. Littlewood

摘要:

我们证明了在强电子-电子和电子-声子相互作用和非绝热条件下($t/ω_0 \leq 1$),一维Hubbard-Holstein模型的最近邻单重态相(来自有效哈密顿量).通过将填充$N_p/N$处的最近邻单态系统映射到填充$N_p/(N-N_p)$处的硬核玻色子(HCB)$t$模型,我们明确地证明了超流性和电荷密度波(CDW)的互斥性,并且对角长程序只在填充1/3处出现.此外,我们还表明,玻色-爱因斯坦凝聚体(BEC)占据数$n_0$的单重态相,类似于$n_0$的HCB紧束缚模型,规模为$\sqrt N$,但是,$\sqrt N$的系数在$n_0$的相互作用的单重态相被数值证明是较小的。

英文摘要:

We show that a nearest-neighbor singlet phase results (from an effective Hamiltonian) for the one-dimensional Hubbard-Holstein model in the regime of strong electron-electron and electron-phonon interactions and under non-adiabatic conditions ($t/ω_0 \leq 1$). By mapping the system of nearest-neighbor singlets at a filling $N_p/N$ onto a hard-core-boson (HCB) $t$-$V$ model at a filling $N_p/(N-N_p)$, we demonstrate explicitly that superfluidity and charge-density-wave (CDW) occur mutually exclusively with the diagonal long range order manifesting itself only at one-third filling. Furthermore, we also show that the Bose-Einstein condensate (BEC) occupation number $n_0$ for the singlet phase, similar to the $n_0$ for a HCB tight binding model, scales as $\sqrt N$; however, the coefficient of $\sqrt N$ in the $n_0$ for the interacting singlet phase is numerically demonstrated to be smaller.

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