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arXiv 2104.08209cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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可果美超导体KV3Sb5正常态的旋转对称破缺

Rotation symmetry breaking in the normal state of a kagome superconductor KV3Sb5

Hong Li, He Zhao, Brenden R. Ortiz, Takamori Park, Mengxing Ye, Leon Balents, Ziqiang Wang, Stephen D. Wilson, Ilija Zeljkovic

摘要:

最近发现的kagome超导体AV_3Sb_5(A=K,Rb,Cs)为实现和研究kagome晶格上关联驱动的电子现象提供了新的机会。在AV3Sb 5 kagome家族的所有成员的正常状态下观察到2a0 × 2a0的电荷密度波(CDW)已经产生了巨大的兴趣,试图揭示这种CDW状态的性质,并识别任何“隐藏的”破缺对称性。我们使用光谱成像扫描隧道显微镜,以揭示一个显着的强度各向异性之间的不同2a0 CDW方向在KV3Sb 5。特别是,通过检查的顺序波矢量的强度作为能量的函数在傅立叶变换的微分电导图,我们发现,CDW方向之一是明显不同的相比,其他两个。这一观察指向一个内在的旋转对称性破缺的电子基态,其中对称性从C6减少到C2。此外,与以前的报道相比,我们发现,CDW相是不敏感的磁场方向,无论存在或不存在的原子缺陷。我们的实验,结合早期观察到的条纹4a0电荷订购CsV3Sb 5,建立相关驱动的旋转对称性破缺作为一个统一的功能AV3Sb 5戈薇超导体。

英文摘要:

Recently discovered kagome superconductors AV3Sb5 (A=K, Rb, Cs) provide a fresh opportunity to realize and study correlation-driven electronic phenomena on a kagome lattice. The observation of a 2a0 by 2a0 charge density wave (CDW) in the normal state of all members of AV3Sb5 kagome family has generated an enormous amount of interest, in an effort to uncover the nature of this CDW state, and identify any "hidden" broken symmetries. We use spectroscopic-imaging scanning tunneling microscopy to reveal a pronounced intensity anisotropy between different 2a0 CDW directions in KV3Sb5. In particular, by examining the strength of ordering wave vectors as a function of energy in Fourier transforms of differential conductance maps, we find that one of the CDW directions is distinctly different compared to the other two. This observation points towards an intrinsic rotation symmetry broken electronic ground state, where the symmetry is reduced from C6 to C2. Furthermore, in contrast to previous reports, we find that the CDW phase is insensitive to magnetic field direction, regardless of the presence or absence of atomic defects. Our experiments, combined with earlier observations of a stripe 4a0 charge ordering in CsV3Sb5, establish correlation-driven rotation symmetry breaking as a unifying feature of AV3Sb5 kagome superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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