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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Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
Hui Chen,Haitao Yang,Bin Hu,Zhen Zhao,Jie Yuan,Yuqing Xing,Guojian Qian,Zihao Huang,Geng Li,Yuhan Ye,Qiangwei Yin,Chunsheng Gong,Zhijun Tu,Hechang Lei,Shen Ma,Hua Zhang,Shunli Ni,Hengxin Tan,Chengmin Shen,Xiaoli Dong,Binghai Yan,Ziqiang Wang,Hong-Jun Gao +22 more
TL;DR: In this paper, the vanadium-based kagome lattice CsV3Sb5 was observed to exhibit a V-shaped pairing gap about 0.5 meV below a transition temperature Tc about 2.3 K.
Journal ArticleDOI
Charge Density Waves and Electronic Properties of Superconducting Kagome Metals.
TL;DR: In this article, the authors investigated the electronic and structural properties of charge density wave (CDW) by first-principles calculations and revealed an inverse Star of David deformation as the $2\ifmmode\times\else\texttimes\fi{}2
Journal ArticleDOI
Chiral flux phase in the Kagome superconductor AV3Sb5
TL;DR: In this article, the authors show that the topological charge density wave phase in the quasi-2D Kagome superconductor AV3Sb5 is a chiral flux phase.
Posted Content
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 +8 more
TL;DR: In this paper, the authors used spectroscopic-imaging scanning tunneling microscopy to reveal a pronounced intensity anisotropy between different 2a0 charge density wave (CDW) directions in KV3Sb5.
Journal ArticleDOI
Electronic instabilities of kagome metals: Saddle points and Landau theory
TL;DR: In this article, the authors used a general continuum model and utilize renormalization group and mean field theory methods to identify mechanisms that can lead to the experimentally observed charge density wave ordering.
References
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TL;DR: This work uses scanning tunneling microscopy to image a previously unknown unidirectional (stripe) charge-density wave (CDW) smoothly interfacing with the familiar trid Directional (triangular) CDW on the surface of the stoichiometric superconductor NbSe2, and suggests a promising direction of inquiry for resolving similarly longstanding debates in cuprate superconductors and other strongly correlated materials.
Journal ArticleDOI
Superconductivity in the $\mathbb{Z}_2$ kagome metal KV$_3$Sb$_5$
Brenden R. Ortiz,P. M. Sarte,Eric Kenney,Samuel M. L. Teicher,Ram Seshadri,Michael Graf,Stephen D. Wilson +6 more
TL;DR: In this article, the authors reported the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal KV$_3$Sb$_5$.
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Evidence for dispersing 1D Majorana channels in an iron-based superconductor
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Doped kagome system as exotic superconductor
TL;DR: In this article, a Chern-Simons theory for the doped spin-1/2 kagome system is constructed, from which it is shown that the system is an exotic superconductor that breaks time-reversal symmetry.
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