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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Rich Nature of Van Hove Singularities in Kagome Superconductor CsV$_3$Sb$_5$
Yong Hu,Xianxin Wu,Brenden R. Ortiz,Sailong Ju,Xinlong Han,Junzhang Ma,Nicholas C. Plumb,Milan Radovic,Ronny Thomale,Stephen D. Wilson,Andreas P. Schnyder,Ming Shi +11 more
TL;DR: In this article, the authors combine polarization-dependent angle-resolved photoemission spectroscopy with density functional theory to directly reveal the sublattice properties of 3d-orbital van Hove singularities in CsV$_3$Sb$_5$.
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Revealing the competition between charge density wave and superconductivity in CsV 3 Sb 5 through uniaxial strain
Tiema Qian,Morten Christensen,Chaowei Hu,Amartyajyoti Saha,Brian M. Andersen,Rafael M. Fernandes,Turan Birol,Ni Ni +7 more
TL;DR: In this article, the authors apply uniaxial strain on the layered kagome superconductor CsV{}_{3}$Sb${}_{5}$.
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Geometry of the charge density wave in the kagome metal A V 3 Sb 5
Hu Miao,Huaping Li,William R. Meier,Amanda Huon,Ho Nyung Lee,Ayman Said,Hechang Lei,Brenden R. Ortiz,Stephen D. Wilson,Jiaxin Yin,M. Z. Hasan,Ziqiang Wang,Hengxin Tan,Binghai Yan +13 more
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Competition between charge-density-wave and superconductivity in the kagome metal Rb V 3 Sb 5
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TL;DR: In this paper, the authors constructed a double superconducting dome and revealed the correlation between the CDW order and superconductivity in the Kagome metal RbV${}{3}$Sb${}_{5}$
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Charge Density Wave Orders and Enhanced Superconductivity under Pressure in the Kagome Metal CsV3Sb5
Qi Wang,Pengfei Kong,Wujun Shi,Cuiying Pei,Chenhaoping Wen,Lingling Gao,Yi Zhao,Qiangwei Yin,Yueshen Wu,Gang Li,Hechang Lei,Jun Li,Yulin Chen,Yulin Chen,Shichao Yan,Yanpeng Qi +15 more
TL;DR: In this article, the authors used high-resolution scanning tunneling microscopy/spectroscopy (STM/STS) to explore the interplay between superconductivity and charge density wave (CDW) in topological kagome metals.
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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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