Enhanced anomalous Hall effect in the magnetic topological semimetal 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Co</mml:mi><mml:msub><mml:mrow /><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>In</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>

Zhou, Huibin; Chang, Guoqing; Wang, Guangqiang; Gui, Xin; Xu, Xitong; Yin, Jia Xin; Guguchia, Zurab; Zhang, Songtian S.; Chang, Tay Rong; Lin, Hsin; Xie, Weiwei; Hasan, M. Zahid; Jia, Shuang

doi:10.1103/physrevb.101.125121

Cited by 43 publications

(49 citation statements)

References 44 publications

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“…4c). Last, we observe In dopant in the vacancy surface in the main paper, and In is known to substitute the Sn atom both experimentally and theoretically [20][21][22] .…”

Section: Methodsmentioning

confidence: 64%

“…We further conclude this assignation by doping the bulk Co 3 Sn 2 S 2 single crystals with 1% In impurities and imaging the layerselective In-dopants. The In impurities preferentially replace the Sn atoms according to previous experimental and theoretical studies 20,21 , as well as our recent systematic single-crystal growth 22 . Indeed, on the vacancy surface identified 11 to be Sn, we observe dilute substitutional atoms with consistent concentration ( Fig.…”

Section: Resultsmentioning

confidence: 89%

“…STM/S measurement. Single crystals 22 of Co 3 S 2-x In x Sn 2 up to 1.5 mm × 1.5 mm × 0.3 mm were used in this study. Samples were cleaved mechanically in situ at 77 K in ultra-high vacuum conditions, and then immediately inserted into the STM head, already at He4 base at 4.2 K. The magnetic field was applied under zero-field cooling, after which we carefully approached the tip to locate the same atomic-scale area for tunneling spectroscopy 11,13 .…”

Section: Methodsmentioning

confidence: 99%

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Spin-orbit quantum impurity in a topological magnet

et al. 2020

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Quantum states induced by single-atomic impurities are at the frontier of physics and material science. While such states have been reported in high-temperature superconductors and dilute magnetic semiconductors, they are unexplored in topological magnets which can feature spin-orbit tunability. Here we use spin-polarized scanning tunneling microscopy/ spectroscopy (STM/S) to study the engineered quantum impurity in a topological magnet Co 3 Sn 2 S 2. We find that each substituted In impurity introduces a striking localized bound state. Our systematic magnetization-polarized probe reveals that this bound state is spindown polarized, in lock with a negative orbital magnetization. Moreover, the magnetic bound states of neighboring impurities interact to form quantized orbitals, exhibiting an intriguing spin-orbit splitting, analogous to the splitting of the topological fermion line. Our work collectively demonstrates the strong spin-orbit effect of the single-atomic impurity at the quantum level, suggesting that a nonmagnetic impurity can introduce spin-orbit coupled magnetic resonance in topological magnets.

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“…4c). Last, we observe In dopant in the vacancy surface in the main paper, and In is known to substitute the Sn atom both experimentally and theoretically [20][21][22] .…”

Section: Methodsmentioning

confidence: 64%

Section: Resultsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

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Spin-orbit quantum impurity in a topological magnet

et al. 2020

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“…At the same time, a large Berry curvature associated with the SOC-gapped Weyl lines was found at the Fermi level in calculations, while the predicted AHE exhibited its maximum value very close to the Fermi level and dropped steeply as one approached the Weyl point energy [180]. As a result, some works suggested that the large AHE and ANE arise predominantly due to Berry curvature concentrated by the Weyl lines [185][186][187]. More broadly, Co 3 Sn 2 S 2 has been a rich playground for a variety of phenomena bringing together the kagome lattice, magnetism and topology, such as negative flat-band magnetism [188].…”

Section: Topological Nodal Line Semimetalsmentioning

confidence: 87%

Weyl, Dirac and high-fold chiral fermions in topological quantum matter

et al. 2021

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Quantum materials hosting Weyl fermions have opened a new era of research in condensed matter physics. First proposed in 1929 in the context of particle physics, Weyl fermions have yet to be observed as elementary particles. In 2015, Weyl fermions were detected as collective electronic excitations in the strong spin-orbit coupled material tantalum arsenide, TaAs. This discovery was followed by a flurry of experimental and theoretical explorations of Weyl phenomena in materials.Weyl materials naturally lend themselves to the exploration of the topological index associated with Weyl fermions and their divergent Berry curvature field, as well as the topological bulk-boundary correspondence giving rise to protected conducting surface states. Here, we review the broader class of Weyl topological phenomena in materials, starting with the observation of emergent Weyl fermions in the bulk and of Fermi arc states on the surface of the TaAs family of crystals by photoemission spectroscopy. We then discuss some of the exotic optical and magnetic responses observed in these materials, as well as the progress in developing some of the related chiral materials.We discuss the conceptual development of high-fold chiral fermions, which generalize Weyl fermions, and we review the observation of high-fold chiral fermion phases by taking the rhodium silicide, RhSi, family of crystals as a prime example. Lastly, we discuss recent advances in Weyl-line phases in magnetic topological materials. With this Review, we aim to provide an introduction to the basic concepts underlying Weyl physics in condensed matter, and to representative materials and their electronic structures and topology as revealed by spectroscopic studies. We hope this work serves as a guide for future theoretical and experimental explorations of chiral fermions and related topological quantum systems with potentially enhanced functionalities.

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“…Given the structural and magnetic stabilities, we propose Co-Pb-S and Co-SnPb-S as magnetic shandite compounds that may be synthesized by experiments. Interestingly, recently, the alloy system Co 3 Sn 2 -xInxS 2 has been synthesized 40,41 by the Bridgeman technique 42 and was identified to maintain a large AHC (1500 ± 300 Ω −1 cm −1 at x = 0.15). Our calculations also confirmed the stability of Co-Sn-S, as it has already been synthesized and identified as an FM WSM 43 .…”

Section: Crystal Structures and Magnetic Ground States For Co-mm'-xmentioning

confidence: 99%

Cobalt-based magnetic Weyl semimetals with high-thermodynamic stabilities

et al. 2021

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Recent experiments identified Co3Sn2S2 as the first magnetic Weyl semimetal (MWSM). Using first-principles calculation with a global optimization approach, we explore the structural stabilities and topological electronic properties of cobalt (Co)-based shandite and alloys, Co3MM’X2 (M/M’ = Ge, Sn, Pb, X = S, Se, Te), and identify stable structures with different Weyl phases. Using a tight-binding model, for the first time, we reveal that the physical origin of the nodal lines of a Co-based shandite structure is the interlayer coupling between Co atoms in different Kagome layers, while the number of Weyl points and their types are mainly governed by the interaction between Co and the metal atoms, Sn, Ge, and Pb. The Co3SnPbS2 alloy exhibits two distinguished topological phases, depending on the relative positions of the Sn and Pb atoms: a three-dimensional quantum anomalous Hall metal, and a MWSM phase with anomalous Hall conductivity (~1290 Ω−1 cm−1) that is larger than that of Co2Sn2S2. Our work reveals the physical mechanism of the origination of Weyl fermions in Co-based shandite structures and proposes topological quantum states with high thermal stability.

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Enhanced anomalous Hall effect in the magnetic topological semimetal Co3Sn2−xInxS2

Cited by 43 publications

References 44 publications

Spin-orbit quantum impurity in a topological magnet

Spin-orbit quantum impurity in a topological magnet

Weyl, Dirac and high-fold chiral fermions in topological quantum matter

Cobalt-based magnetic Weyl semimetals with high-thermodynamic stabilities

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