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arXiv 1707.06759cond-mat.str-elcond-mat.dis-nn
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具有吸引相互作用的一维无自旋费米子的多体局域化

Many-body localization of spinless fermions with attractive interactions in one dimension

Sheng-Hsuan Lin, B. Sbierski, F. Dorfner, C. Karrasch, F. Heidrich-Meisner

摘要:

本文研究了在非关联对角无序情况下具有吸引相互作用的一维无自旋费米子的有限能量密度相图。与排斥相互作用的情况不同,离域的Luttinger-液相在基态中保持弱无序,这是一个众所周知的结果。我们重新审视基态相图,并表明,最近推出的占领频谱不连续性计算的本征谱的单粒子密度矩阵是显着较小的Luttinger液体相比,本地化区域。此外,我们使用泛函重整化方案来研究电导的有限尺寸依赖性,这解决了Luttinger液体的存在,以及是计算便宜。我们的主要结果涉及有限能量密度的情况。利用精确对角化和计算各种已建立的多体局域化-离域化转变的测度,我们论证了零温Luttinger液体平滑地演化为有限能量密度遍历相,没有任何中间相变。

英文摘要:

We study the finite-energy density phase diagram of spinless fermions with attractive interactions in one dimension in the presence of uncorrelated diagonal disorder. Unlike the case of repulsive interactions, a delocalized Luttinger-liquid phase persists at weak disorder in the ground state, which is a well-known result. We revisit the ground-state phase diagram and show that the recently introduced occupation-spectrum discontinuity computed from the eigenspectrum of one-particle density matrices is noticeably smaller in the Luttinger liquid compared to the localized regions. Moreover, we use the functional renormalization scheme to study the finite-size dependence of the conductance, which resolves the existence of the Luttinger liquid as well and is computationally cheap. Our main results concern the finite-energy density case. Using exact diagonalization and by computing various established measures of the many-body localization-delocalization transition, we argue that the zero-temperature Luttinger liquid smoothly evolves into a finite-energy density ergodic phase without any intermediate phase transition.

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