Robust kagome electronic structure in the topological quantum magnets 
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Gu, Xiaokun; C., Chen,; Wei, Wensen; Gao, Lingling; Y., Liu, J.; Du, Xiaofan; Pei, Ding; Zhou, Jingwen; Xu, Ruohang; Yin, Z. X.; Zhao, Wenxuan; Li, Yening; Bostwick, Aaron; Rotenberg, Eli; Backes, Dirk; Veiga, L. S. I.; Dhesi, S. S.; Hesjedal, T.; Laan, G. van der; Du, Haifeng; Jiang, Wen; Qi, Yi-Jun; Li, G.; Shi, Wenyu; Liu, Z. K.; L., Chen, Y.; Yang, Lexian

doi:10.1103/physrevb.105.155108

Cited by 22 publications

(8 citation statements)

References 47 publications

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“…The linear Dirac dispersion near E F with intrinsic Berry curvature can induce the anomalous Hall effect and quantum oscillations [12,23,24]. The calculated bands have to be renormalized by a factor of ∼2 to match the main observed dispersions, indicative of the moderate electron correlations in RMn 6 Sn 6 [21,25]. On the other hand, although 4f electrons of R atoms could not affect bands near E F [21], the 3d electron magnetism and correlations would be affected by 4f electrons via the magnetic exchange coupling [23,26].…”

Section: Introductionmentioning

confidence: 93%

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Ding

Liu

Zhao

et al. 2023

J. Phys.: Condens. Matter

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RV6Sn6 (R = Y and lanthanides) with two-dimensional vanadium-kagome surface states is an ideal platform to investigate kagome physics and manipulate the kagome features to realize novel phenomena. Utilizing the micron-scale spatially resolved angle-resolved photoemission spectroscopy and ﬁrst-principles calculations, we report a systematical study of the electronic structures of RV6Sn6 (R = Gd, Tb, and Lu) on the two cleaved surfaces, i.e., the V- and RSn1-terminated (001) surfaces. The calculated bands without any renormalization match well with the main ARPES dispersive features, indicating the weak electronic correlation in this system. We observe ’W’-like kagome surface states around the Brillouin zone corners showing R-element-dependent intensities, which is probably due to various coupling strengths between V and RSn1 layers. Our ﬁnding suggests an avenue for tuning electronic states by interlayer coupling based on two-dimensional kagome lattices.

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Section: Introductionmentioning

confidence: 93%

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Ding

Liu

Zhao

et al. 2023

J. Phys.: Condens. Matter

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“…2(d), ARPES spectra show no noticeable temperature dependence, similar to some reported magnetic topological materials not sensitive to magnetic order, such as RMn 6 Sn 6 (R = rare earth metal). [41][42][43][44][45][46][47][48][49] Therefore, unless otherwise emphasized, all ARPES spectra in this work are based on data measured at 14.7 K and the energy bands calculations are based on the nonmagnetic phase.…”

Section: Resultsmentioning

confidence: 99%

“…These topological phenomena have also been observed in other magnetic topological materials such as Co 3 Sn 2 S 2 , [37,38] Co 2 MnGa, [39,40] and RMn 6 Sn 6 (R = rare earth metal). [41][42][43][44][45][46][47][48][49] In fact, exploring new topological states and novel phenomena based on 3d magnetic transition metal atoms (Mn, Fe, Co, Ni) represents a main trend. By comparison, magnetic topological states of matter based on magnetic rare earth atoms remain largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

Multiple surface states, nontrivial band topology, and antiferromagnetism in GdAuAl₄Ge₂

et al. 2023

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Magnetic topological states of matter provide a fertile playground for emerging topological physics and phenomena. The current main focus is on materials whose magnetism stems from 3d magnetic transition elements, e.g., MnBi2Te4, Fe3Sn2 and Co3Sn2S2. In contrast, topological materials with the magnetism from rare earth elements remain largely unexplored. Here we report rare earth antiferromagnet GdAuAl4Ge2 as a candidate magnetic topological metal. Angle resolved photoemission spectroscopy and first-principles calculations have revealed multiple bulk bands crossing the Fermi level and pairs of low energy surface states. According to the parity and Wannier charge center analyses, these bulk bands possess nontrivial Z2 topology, establishing a strong topological insulator state in the nonmagnetic phase. Furthermore, the surface band pairs exhibit strong termination dependence which provides insight into their origin. Our results suggest GdAuAl4Ge2 as a rare earth platform to explore the interplay between band topology, magnetism and f electron correlation, calling for further study targeting on its magnetic structure, magnetic topology state, transport behavior and microscopic properties.

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“…The van Hove singularities, which are closely related to the CDW and the unconventional superconductivity, were also observed in the kagome superconductor AV 3 Sb 5 , where A = K, Cs, Rb (figures 1(f) and (g)) [39]. We have summarized recent materials hosting a transition-metalbased kagome lattice in table 1. In this Review, we highlight the kagome R166 (R = rare earths) magnet with RMn 6 Sn 6 being representative, where the quantum interactions within the pristine Mn kagome lattice and with the localized 4f electrons induce ample topological properties [52][53][54][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91][92][93][94]. We first review the experimental visualizations of distinct kagome bands encoded in the unique crystal structure and magnetism.…”

mentioning

confidence: 99%

Quantum interactions in topological R166 kagome magnet

Xu,

Yin,

et al. 2023

Rep. Prog. Phys.

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Kagome magnet has been found to be a fertile ground for the search of exotic quantum states in condensed matter. Arising from the unusual geometry, the quantum interactions in the kagome lattice give rise to various quantum states, including the Chern-gapped Dirac fermion, Weyl fermion, flat band and van Hove singularity. Here we review recent advances in the study of the R166 kagome magnet (RT6E6, R = rare earths; T = transition metals; and E = Sn, Ge, etc) whose crystal structure highlights the transition-metal-based kagome lattice and rare-earth sublattice. Compared with other kagome magnets, the R166 family owns the particularly strong interplays between the d electrons on the kagome site and the localized f electrons on the rare-earth site. In the form of spin-orbital coupling, exchange interaction and many-body effect, the quantum interactions play an essential role in the Berry curvature in both the reciprocal and real spaces of R166 family. We discuss the spectroscopic and transport visualization of the topological electrons hosted in the Mn kagome layer of RMn6Sn6 and the various topological effects due to the quantum interactions, including the Chern-gap opening, the exchange-biased effect, the topological Hall effect and the emergent inductance. We hope this work serves as a guide for future explorations of quantum magnets.

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Robust kagome electronic structure in the topological quantum magnets XMn6Sn6 (X=Dy,Tb,Gd

Cited by 22 publications

References 47 publications

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Multiple surface states, nontrivial band topology, and antiferromagnetism in GdAuAl₄Ge₂

Quantum interactions in topological R166 kagome magnet

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Robust kagome electronic structure in the topological quantum magnets XMn6Sn6 (X=Dy,Tb,Gd

Cited by 22 publications

References 47 publications

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Kagome surface states and weak electronic correlation in vanadium-kagome metals

Multiple surface states, nontrivial band topology, and antiferromagnetism in GdAuAl4Ge2

Quantum interactions in topological R166 kagome magnet

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Multiple surface states, nontrivial band topology, and antiferromagnetism in GdAuAl₄Ge₂