Topological kagome magnets and superconductors.
Jiaxin Yin,Biao Lian,M. Z. Hasan +2 more
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TLDR
In this paper , the fundamental concepts of a kagome lattice, realizations of Chern and Weyl topological magnetism, flat-band many-body correlations, and unconventional charge-density waves and superconductivity are reviewed.Abstract:
A kagome lattice naturally features Dirac fermions, flat bands and van Hove singularities in its electronic structure. The Dirac fermions encode topology, flat bands favour correlated phenomena such as magnetism, and van Hove singularities can lead to instabilities towards long-range many-body orders, altogether allowing for the realization and discovery of a series of topological kagome magnets and superconductors with exotic properties. Recent progress in exploring kagome materials has revealed rich emergent phenomena resulting from the quantum interactions between geometry, topology, spin and correlation. Here we review these key developments in this field, starting from the fundamental concepts of a kagome lattice, to the realizations of Chern and Weyl topological magnetism, to various flat-band many-body correlations, and then to the puzzles of unconventional charge-density waves and superconductivity. We highlight the connection between theoretical ideas and experimental observations, and the bond between quantum interactions within kagome magnets and kagome superconductors, as well as their relation to the concepts in topological insulators, topological superconductors, Weyl semimetals and high-temperature superconductors. These developments broadly bridge topological quantum physics and correlated many-body physics in a wide range of bulk materials and substantially advance the frontier of topological quantum matter. Recent key developments in the exploration of kagome materials are reviewed, including fundamental concepts of a kagome lattice, realizations of Chern and Weyl topological magnetism, flat-band many-body correlations, and unconventional charge-density waves and superconductivity. read more
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Nodeless electron pairing in CsV_3Sb_5-derived kagome superconductors
Yigui Zhong,Jinjin Liu,Xin Wu,Zurab Guguchia,J. Yin,Akifumi Mine,Yongkai Li,Sahand Najafzadeh,Debarchan Das,Charles Mielke,Rustem Khasanov,Hubertus Luetkens,Takeshi Suzuki,Kecheng Liu,Xinloong Han,Takeshi Kondo,Jiangping Hu,Shik Shin,Zhiwei Wang,Xun Shi,Yugui Yao,Kozo Okazaki +21 more
TL;DR: In this paper , a nodeless, nearly isotropic, and orbital-independent superconducting gap in the momentum space of two CsV$_3$Sb$_5$-derived kagome superconductors was observed.
Journal ArticleDOI
Intertwining of Magnetism and Charge Ordering in Kagome FeGe.
S. M. Shao,Jiaxin Yin,Ilya Belopolski,Jing-Yang You,Tao Hou,Hongyu Chen,Yu Xiao Jiang,Md. Shafayat Hossain,M. Yahyavi,Chia-Hsiu Hsu,Yuan Ping Feng,Arun Bansil,M. Z. Hasan,Guoqing Chang +13 more
TL;DR: In this article , the structural and electronic properties of antiferromagnet FeGe have been investigated and it was shown that the 2 × 2 × 1 × 1 charge density wave (CDW) in FeGe likely results from the Fermi surface nesting of hexagonal-prism-shaped kagome states.
Universal sublinear resistivity in vanadium kagome materials hosting charge density waves
Shirin Mozaffari,William R. Meier,Richa Pokharel Madhogaria,N. S. Peshcherenko,Seoung-Hun Kang,John Villanova,H. Suriya Arachchige,Guoxin Zheng,Yuansen Zhu,Kuan Chen,Dechen Zhang,Lu Li,Mina Yoon,Yang Zhang,David Mandrus +14 more
TL;DR: In this article , the authors compared the transport properties of ScV$_6$Sn$-6$ and LuV$6$sn$-7$ with a vanadium-containing kagome compound.
Novel three-dimensional Fermi surface and electron-correlation-induced charge density wave in FeGe
TL;DR: In this paper , the authors performed a comprehensive study of the band structures, Fermi surfaces and nesting function of FeGe through first-principles calculations, and found that the maximum of nesting function is at $K$ point instead of $M$ point.
Kagome and honeycomb flat bands in moir\'e graphene
Michael Scheer,Biao Lian +1 more
TL;DR: In this article , a class of graphene-based moir\'e systems hosting flat bands on kagome and honeycomb superlattices was proposed, where the potentials are induced by a 2D irreducible core presentation in the substrate.
References
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