Unconventional Fermi Surface Instabilities in the Kagome Hubbard Model
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TLDR
Finite angular momentum spin and charge density wave order, a twofold degenerate d-wave Pomeranchuk instability, and f-wave superconductivity away from van Hove filling make the kagome Hubbard model the prototypical scenario for several unconventional Fermi surface instabilities.Abstract:
We investigate the competing Fermi surface instabilities in the kagome tight-binding model. Specifically, we consider on-site and short-range Hubbard interactions in the vicinity of van Hove filling of the dispersive kagome bands where the fermiology promotes the joint effect of enlarged density of states and nesting. The sublattice interference mechanism devised by Kiesel and Thomale [Phys. Rev. B 86, 121105 (2012)] allows us to explain the intricate interplay between ferromagnetic fluctuations and other ordering tendencies. On the basis of the functional renormalization group used to obtain an adequate low-energy theory description, we discover finite angular momentum spin and charge density wave order, a twofold degenerate d-wave Pomeranchuk instability, and f-wave superconductivity away from van Hove filling. Together, this makes the kagome Hubbard model the prototypical scenario for several unconventional Fermi surface instabilities. DOI: 10.1103/PhysRevLett.110.126405read more
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Journal ArticleDOI
Cs V 3 Sb 5 : A Z 2 Topological Kagome Metal with a Superconducting Ground State
Brenden R. Ortiz,Samuel M. L. Teicher,Yong Hu,Julia L. Zuo,P. M. Sarte,Emily C. Schueller,A. M. Milinda Abeykoon,M. J. Krogstad,Stephan Rosenkranz,Raymond Osborn,Ram Seshadri,Leon Balents,Junfeng He,Stephen D. Wilson +13 more
TL;DR: The electronic properties of CsV_{3}Sb_{5} are presented, demonstrating bulk superconductivity in single crystals with a T_{c}=2.5 K, and the implications for the formation of unconventional super conductivity in this material are discussed.
Journal ArticleDOI
Unconventional chiral charge order in kagome superconductor KV3Sb5.
Yu-Xiao Jiang,Jiaxin Yin,M. Michael Denner,Nana Shumiya,Brenden R. Ortiz,Gang Xu,Zurab Guguchia,Junyi He,Shafayat Hossain,Xiaoxiong Liu,Jacob Ruff,Linus Kautzsch,Songtian S. Zhang,Guoqing Chang,Ilya Belopolski,Qi Zhang,Tyler A. Cochran,Daniel Multer,Maksim Litskevich,Zijia Cheng,Xian P. Yang,Ziqiang Wang,Ronny Thomale,Titus Neupert,Stephen D. Wilson,M. Zahid Hasan +25 more
TL;DR: In this paper, the authors used high-resolution scanning tunnelling microscopy to discover an unconventional chiral charge order in a kagome material, KV3Sb5, with both a topological band structure and a superconducting ground state.
Journal ArticleDOI
Superconductivity and Normal-State Properties of Kagome Metal RbV$_{3}$Sb$_{5}$ Single Crystals
TL;DR: In this article, the discovery of superconductivity and detailed normal-state physical properties of RbV3Sb5 single crystals with V kagome lattice were reported.
Journal ArticleDOI
Superconductivity in the Z 2 kagome metal KV 3 Sb 5
Brenden R. Ortiz,P. M. Sarte,Eric Kenney,Michael Graf,Samuel M. L. Teicher,Ram Seshadri,Stephen D. Wilson +6 more
TL;DR: In this paper, the authors reported the observation of bulk superconductivity in single crystals of the two-dimensional kagome metal (KV, Rb, Cs) with magnetic susceptibility, resistivity, and heat capacity measurements.
Journal ArticleDOI
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.
References
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BookDOI
Frustrated Spin Systems
TL;DR: Nagai et al. as discussed by the authors investigated the phase transition in frustrated ising spin systems and proposed two-dimensional spin liquid antiferromagnets and spin glasses, respectively.
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