Real- and reciprocal space characterization of the three-dimensional charge density wave in quasi-one-dimensional CuTe,Physical Review B

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Real- and reciprocal space characterization of the three-dimensional charge density wave in quasi-one-dimensional CuTe
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevb.110.115112
Fei Guo _{1,

1} , Michele Puppin _{1,

1} , Lukas Hellbrück _{1,

1} , Arnaud Magrez ₁ , Eduardo B. Guedes ₂ , Igor Sokolović ₃ , J. Hugo Dil _{1,

1,

2}

Affiliation

Low-dimensional materials are susceptible to electronic instabilities such as charge density waves (CDWs), originating from a divergence in the Lindhard electron response function, combined with a finite electron-phonon coupling strength. In this paper, we present a detailed characterization of the CDW in the quasi-one-dimensional material CuTe, including (1) direct visualization of lattice distortion seen with noncontact atomic force microscopy in real space, (2) the out-of-plane momentum dependency of the CDW gap size of the quasi-one-dimensional bands by angle-resolved photoemission spectroscopy, and (3) coherent dynamics of a photoexcited phonon mode seen by time- and angle-resolved photoemission spectroscopy, with frequency and wave vector

q_{CDW}

corresponding to the soft phonon modes predicted by theory. Furthermore, we find that the CDW gap closes through a transient band renormalization. We thus confirm that, despite the quasi-one-dimensional characteristics of CuTe, it hosts inherently three-dimensional CDWs.

中文翻译：

准一维 CuTe 中三维电荷密度波的实空间和倒易空间表征

低维材料容易受到电子不稳定性的影响，例如电荷密度波（CDW），其源于林德哈德电子响应函数的发散以及有限的电子声子耦合强度。在本文中，我们详细描述了准一维材料 CuTe 中的 CDW，包括（1）在真实空间中用非接触原子力显微镜观察到的晶格畸变的直接可视化，（2）面外通过角度分辨光电子能谱分析准一维带的 CDW 间隙大小的动量依赖性，以及（3）通过时间和角度分辨光电子能谱观察到的光激发声子模式的相干动力学，具有频率和波矢量