Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV$_3$Sb$_5$
Zuowei Liang,Xing-Yuan Hou,Fan Zhang,Wanru Ma,Ping Wu,Zongyuan Zhang,Fanghang Yu,Jianjun Ying,Kun Jiang,Lei Shan,Zhenyu Wang,X. H. Chen +11 more
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In this article, the authors used scanning tunneling microscopy (STM) to study a newly discovered Z$2$ topological kagome metal CsV$_3$Sb$_5$ with a superconducting ground state.Abstract:
The transition-metal-based kagome metals provide a versatile platform for correlated topological phases hosting various electronic instabilities. While superconductivity is rare in layered kagome compounds, its interplay with nontrivial topology could offer an engaging space to realize exotic excitations of quasiparticles. Here, we use scanning tunneling microscopy (STM) to study a newly discovered Z$_2$ topological kagome metal CsV$_3$Sb$_5$ with a superconducting ground state. We observe charge modulation associated with the opening of an energy gap near the Fermi level. When across single-unit-cell surface step edges, the intensity of this charge modulation exhibits a {\pi}-phase shift, suggesting a three-dimensional 2$\times$2$\times$2 charge density wave ordering. Interestingly, a robust zero-bias conductance peak is observed inside the superconducting vortex core on the Cs 2$\times$2 surfaces that does not split in a large distance when moving away from the vortex center, resembling the Majorana bound states arising from the superconducting Dirac surface states in Bi$_2$Te$_3$/NbSe$_2$ heterostructures. Our findings establish CsV$_3$Sb$_5$ as a promising candidate for realizing exotic excitations at the confluence of nontrivial lattice geometry, topology and multiple electronic orders.read more
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Distinct band reconstructions in kagome superconductor CsV$_3$Sb$_5$
Yang Luo,Shuting Peng,Samuel M. L. Teicher,Linwei Huai,Yong Hu,Brenden R. Ortiz,Zhiyuan Wei,Jianchang Shen,Zhipeng Ou,Bingqian Wang,Yu Miao,Mingyao Guo,Ming Shi,Stephen D. Wilson,Jiankui He +14 more
TL;DR: In this article, angle-resolved photoemission spectroscopy (ARPES) evidence for two distinct band reconstructions in CsV$_3$Sb$_5$ was reported.
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Evolution of electronic structure in pristine and hole-doped kagome metal RbV$_3$Sb$_5$
Jiawei Yu,Kebin Xiao,Yonghao Yuan,Qiangwei Yin,Zhiqiang Hu,Chunsheng Gong,Yunkai Guo,Zhijun Tu,Hechang Lei,Qi-Kun Xue,Wei Li +10 more
TL;DR: In this article, in situ low-temperature (4 K) scanning tunneling microscope measurements of atomic and electronic structures of the cleaved surfaces of an alkali-based kagome metal RbV$_3$Sb$_5$ single crystals are reported.
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Theory of the charge-density wave in $A$V$_3$Sb$_5$ kagome metals
TL;DR: In this article, a phenomenological Landau model for the charge-density wave (CDW) phase of kagome compounds was derived and solved using group-theory and density-functional theory.
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Emergence of Quantum Confinement in Topological Kagome Superconductor CsV$_3$Sb$_5$ family.
Yongqing Cai,Yuan Wang,Zhanyang Hao,Yixuan Liu,Xiaoming Ma,Zecheng Shen,Zhicheng Jiang,Yichen Yang,Wanling Liu,Qi Jiang,Zhengtai Liu,Mao Ye,Dawei Shen,Zhe Sun,Jiabin Chen,Le Wang,Cai Liu,Junhao Lin,Jianfeng Wang,Bing Huang,Jia-Wei Mei,Chaoyu Chen +21 more
TL;DR: In this article, the dominant role of quantum confinement in determining the surface electronic structure of kagome superconductor CsV$_3$Sb$_5$ (A=K, Rb, Cs) was revealed.
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Gate-controllable giant anomalous Hall effect from flat bands in kagome metal CsV3Sb5 nanoflakes.
Guolin Zheng,Zheng Chen,Cheng Tan,Maoyuan Wang,Xiangde Zhu,Sultan Albarakati,Meri Algarni,Jim G. Partridge,Lawrence Farrar,Jianhui Zhou,Wei Ning,Mingliang Tian,Michael S. Fuhrer,Lan Wang +13 more
TL;DR: In this paper, gate-induced proton intercalations can largely modulate the carrier density of CsV3Sb5 nanoflakes and change the Fermi surface topology from a hole pocket to an electron pocket.
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TL;DR: A sharp zero-bias peak inside a vortex core that does not split when moving away from the vortex center is observed, consistent with the tunneling to a nearly pure MBS, separated from nontopological bound states.
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