Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of 
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Peng, Shuting; Han, Yulei; Pokharel, Ganesh; Shen, Jianchang; Li, Zeyu; Hashimoto, Makoto; Lü, Donghui; Ortiz, Brenden R.; Luo, Yang; Li, Houchen; Guo, Mingyao; Wang, Bingqian; Cui, Shengtao; Sun, Zhe; Qiao, Zhenhua; Wilson, Stephen D.; He, Junfeng

doi:10.1103/physrevlett.127.266401

Cited by 73 publications

(32 citation statements)

References 36 publications

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“…Due to the two possible surface terminations upon cleaving [Fig. 1a(iii)], we expect to observe two different types of ARPES spectra [29]. By using a small beam spot and measuring the Sn 4d core level, we have resolved the two types of terminations on the cleaved sample surface and probed their electronic structures separately.…”

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confidence: 99%

Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV6Sn6

Yang

et al. 2022

Preprint

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Realizing and tuning novel electronic states is of great interest and importance to modern condensed-matter physics and spintronics applications. Transition-metal-based kagome materials are a rich frontier for the investigation of novel topological electronic states and correlated phenomena. The divergent density of states in the kagome lattice due to van Hove singularities (VHSs) in the vicinity of the Fermi level (EF) also provide an ideal playground for the search of exotic correlated quantum states on a kagome lattice. However, in the idealized two-dimensional kagome lattice, topologically non-trivial Dirac surface states (TDSSs) have not been unambiguously observed, and the manipulation of TDSSs and VHSs remains largely unexplored. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, we clearly reveal TDSSs originating from a ℤ2 bulk topology for the first time in kagome lattices and identify two types of VHSs near EF in a newly discovered magnetic kagome material, GdV6Sn6. Remarkably, using in-situ surface potassium deposition to elevate carrier density, we successfully realize manipulation of the TDSSs and VHSs. The Dirac point of the TDSSs can be tuned from above to below EF, which reverses the chirality of the spin texture at the Fermi surface. These results not only establish GdV6Sn6 as a fascinating platform for studying the nontrivial band topology, magnetism and correlation effects native to kagome lattices, but also open up a new avenue for the potential application of spintronic devices based on kagome materials.

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confidence: 99%

Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV6Sn6

Yang

et al. 2022

Preprint

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“…The agreement with the experimental results indicates that our present calculations are resonable, and the stable structures presented here are likely to be synthesized in future experiments. Very recently, a newly discovered family of kagome metals RV 6 Sn 6 (R = Gd, Ho, Y) with two V-derived kagome layers in the primitive cell was also synthesized by flux method [39,40]. Therefore, the versatile and matured flux method could be employed to synthesize the stable structures in Table S1.…”

Section: N(ef ) (Evmentioning

confidence: 99%

Large kagome family candidates with topological superconductivity and charge density waves

Yi¹,

Ma²,

Zhang³

et al. 2022

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A group of newly discovered non-magnetic metal kagome structures AV3Sb5 (A=K, Rb, Cs) have aroused widespread interest in experiment and theory due to their unusual charge density wave (CDW) and intertwined superconductivity. However, they all possess weak electron-phonon coupling (EPC) and low superconducting transition temperature. Here, we performed high-throughput firstprinciples calculations on novel kagome candidates with AV3Sb5 prototype structure, and proposed 24 dynamically stable novel kagome metals. The calculation based on Bardeen-Cooper-Schrieffer theory shows that most of these metals are superconductors with much stronger EPC than the reported AV3Sb5 materials, and their superconducting transition temperatures Tc is between 0.3 and 5.0K. Additionally, several compounds, such as KZr3Pb5 with the highest Tc, are identified as Z2 topological metals with clear Dirac cone topological surface states near Fermi level. NaZr3As5 is shown to have possible CDW phases. Our results provide rich platforms for exploring various new physics with the prototype kagome structure, in which the coexistence of superconductivity and nontrivial topological nature provides promising insights on the discovery of topological superconductors.

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“…An appealing complement to these studies is to explore 166-kagome metals where the magnetic interactions/anisotropies can be tuned independent of the kagome lattice, and to, in turn, control the interplay between magnetic order and the kagome-derived band structure. Specifically, vanadium-based kagome metals of the form RV 6 Sn 6 , are recently identified materials for allowing this interplay [6,26,31]. The presence of topological surface states, Dirac cones, and van Hove singularities near E F in these compounds support the idea of interfacing magnetism with the topological electronic features of the nonmagnetic kagome sublattice.…”

Section: Introductionmentioning

confidence: 98%

“…within kagome metals seemingly validates their promise as hosts of a rich frontier of unconventional ground states and phase behaviors. In particular, kagome metals that crystallize in the MgFe 6 Ge 6 structural prototype, or 166-kagome metals, have recently been proposed as a chemically flexible route for exploring the interplay between topology, correlations and magnetism [5,6,10,[20][21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Highly anisotropic magnetism in the vanadium-based kagome metal TbV6Sn6

Pokharel¹,

Ortiz²,

Sarte³

et al. 2022

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RV 6 Sn 6 (R=rare earth) compounds are appealing materials platforms for exploring the interplay between R-site magnetism and nontrivial band topology associated with the nonmagnetic vanadium-based kagome network. Here we present the synthesis and characterization of the kagome metal TbV 6 Sn 6 via single crystal x-ray diffraction, magnetization, transport, and heat capacity measurements. Magnetization measurements reveal strong, uniaxial magnetic anisotropy rooted in the alignment of Tb 3+ moments in the interplane direction below 4.3(2) K. TbV 6 Sn 6 exhibits multiband transport behavior with high mobilities of charge carriers, and our measurements suggest TbV 6 Sn 6 is a promising candidate for hosting Chern gaps driven via the interplay between Tb-site magnetic order and the band topology of the V-site kagome network.

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Realizing Kagome Band Structure in Two-Dimensional Kagome Surface States of RV6Sn6 (

Cited by 73 publications

References 36 publications

Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV6Sn6

Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Metal GdV6Sn6

Large kagome family candidates with topological superconductivity and charge density waves

Highly anisotropic magnetism in the vanadium-based kagome metal TbV6Sn6

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