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arXiv 2008.01401cond-mat.str-el
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铜氧化物中声子诱导电荷序的内在特征

Intrinsic Hallmarks of Phonon-Induced Charge Order in Cuprates

S. Banerjee, W. A. Atkinson, A. P. Kampf

AI总结:

本文提出欠掺杂铜氧化物中的电荷密度波源于B1g声子与电子关联的协同作用,证明该声子诱导的CDW能重构费米面并产生与实验一致的量子振荡频率,且单胞电荷调制呈s波特征。

摘要:

欠掺杂高温铜氧化物超导体中的电荷密度波(CDW)调制仍是凝聚态物理学中的一个核心谜题。然而,尽管在大量高 $T_{\mathrm{c}}$ 铜氧化物中对这一普遍存在的相进行了大量实验验证,目前仍缺乏对该相的完整理论解释。在此,我们基于近期提出的观点展开研究,即欠掺杂铜氧化物(Y基和Bi基化合物)中的CDW源于 B$_{1g}$ 键弯曲声子与强电子关联的独特协同作用。我们假设存在具有 B$_{1g}$ 对称性的静态平均场晶格畸变(无论其起源如何),其公度波矢为 $\mathbf{q}^*=(2π/3,0)/(0,2π/3)$。我们证明,这种声子诱导的CDW(单轴和双轴)会重构费米面,产生电子和空穴口袋,其相关的量子振荡频率与实验高度一致。此外,我们还系统分析了铜氧平面内单胞内电荷调制的对称性。我们发现,CuO$_2$ 单胞上的原子电荷调制主要表现为 $s$ 波特征,这支持了近期的实验观测结果。

英文摘要:

Charge-density wave (CDW) modulations in underdoped high-temperature cuprate superconductors remain a central puzzle in condensed matter physics. However, despite a substantial experimental verification of this ubiquitous phase in a large class of high $T_{\mathrm{c}}$ cuprates, a complete theoretical explanation of this phase is still missing. Here, we build upon our recent proposal that the CDW in underdoped cuprates (Y- and Bi- based compounds) emerges from a unique cooperation of the B$_{1g}$ bond-buckling phonon with strong electronic correlations. We assume a static mean-field lattice distortion with B$_{1g}$ symmetry, regardless of its origin, with a commensurate wave vector $\mathbf{q}^*=(2π/3,0)/(0,2π/3)$. We show that such a phonon-induced CDW (both uni- and bi-axial) reconstructs the Fermi surface, leading to electron and hole pockets, with relevant quantum oscillation frequencies in close consistency with the experiments. Furthermore, a systematic analysis of the symmetry of the intra-unit-cell charge modulations on the copper-oxygen planes is provided. We find that the atomic charge modulation on the CuO$_2$ unit cell is predominantly of $s$-wave character -- in support of the recent experimental observation.

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