论文标题
丘比特语音子诱导的充电顺序的固有标志
Intrinsic Hallmarks of Phonon-Induced Charge Order in Cuprates
论文作者
论文摘要
在低温库层超导体中，电荷密度波（CDW）的调制是凝结物理学的中心难题。但是，尽管在一大批高$ t _ {\ mathrm {c}} $ cuprates中对这个无处不在的阶段进行了实验验证，但仍然缺少对此阶段的完整理论解释。在这里，我们建立在最近的提议的基础上，即CDW在不足的铜层中（Y和BI-基化合物）源于B $ _ {1G} $ bond buckling the子具有强电子相关性的独特合作。我们假设使用B $ _ {1G} $对称性的静态平均晶格失真，无论其起源如何，具有相称的Wave vector $ \ mathbf {q}^*=（2π/3,0）/（0,2π/3）$。我们表明，这种声子诱导的CDW（单轴和双轴）重建了费米表面，导致电子和孔口袋，相关的量子振荡频率与实验紧密一致。此外，还提供了对铜氧平面上单元内电荷调制调制的对称性的系统分析。我们发现，在CUO $ _2 $单元电池上的原子电荷调制主要是$ s $ - 波角色 - 支持最近的实验观察。
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.
