Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2

Howard, Sean; Jiao, Lin; Wang, Zhenyu; Morali, Noam; Batabyal, R.; Kumar-Nag, Pranab; Avraham, Nurit; Beidenkopf, Haim; Vir, Praveen; Liu, Enke; Shekhar, Chandra; Felser, Claudia; Hughes, Taylor L.; Madhavan, Vidya

doi:10.1038/s41467-021-24561-3

Cited by 56 publications

(25 citation statements)

References 44 publications

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“…STM further finds presence of linearly dispersing step-edge modes (Fig. 3g) [121], while theory predicts isolated Co3Sn sheets will exhibit QAHE [123].…”

Section: Ferromagnetic Compoundsmentioning

confidence: 92%

Progress and prospects in magnetic topological materials

Bernevig

Felser

Beidenkopf

2022

Nature

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260

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Magnetic topological materials represent a class of compounds whose properties are strongly influenced by the topology of the electronic wavefunctions coupled with the magnetic spin configuration. Such materials can support chiral electronic channels of perfect conduction, and can be used for an array of applications from information storage and control to dissipationless spin and charge transport. Here, we review the theoretical and experimental progress achieved in the field of magnetic topological materials beginning with the theoretical prediction of the Quantum Anomalous Hall Effect without Landau levels, and leading to the recent discoveries of magnetic Weyl semimetals and antiferromagnetic topological insulators. We outline the recent theoretical progress that resulted in the tabulation, for the first time, of all magnetic symmetry group representations and topology. We describe several experiments realizing Chern insulators, Weyl and Dirac magnetic semimetals, and an array of axionic and higher-order topological phases of matter as well as survey future perspectives.

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“…STM further finds presence of linearly dispersing step-edge modes (Fig. 3g) [121], while theory predicts isolated Co3Sn sheets will exhibit QAHE [123].…”

Section: Ferromagnetic Compoundsmentioning

confidence: 92%

Progress and prospects in magnetic topological materials

Bernevig

Felser

Beidenkopf

2022

Nature

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260

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“…In this study, we focus on the TPT and apply high pressure to investigate the evolution of topological states in a Co 3 Sn 2 S 2 Weyl magnet. Since its discovery, [ 21–24 ] significant topological characteristics, including giant anomalous Hall effects (AHEs), [ 21,22 ] anomalous Nernst effects, [ 25,26 ] surface Fermi arcs, [ 23,24 ] chiral edge states, [ 27,28 ] giant magneto‐optical Kerr effects, [ 29 ] spin‐orbit polaron, [ 30 ] low‐resistance state/exceptional Hall component, [ 31 ] spin wave gap, [ 32 ] and anisotropic magnetoelastic response [ 33 ] have been observed in Co 3 Sn 2 S 2 , rendering it an ideal platform for TPTs with TRS breaking and restoration. Recently, pressure studies have been performed to adjust the giant AHE of Co 3 Sn 2 S 2 , where it is discovered that the intrinsic mechanism‐dominated AHE decreased during pressure loading.…”

Section: Introductionmentioning

confidence: 99%

Pressure‐Driven Magneto‐Topological Phase Transition in a Magnetic Weyl Semimetal

et al. 2022

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The co-occurrence of phase transitions with local and global order parameters, such as entangled magnetization and topological invariants, is attractive but seldom realized experimentally. In this study, a magneto-topological phase transition (magneto-TPT), that is, the phenomenon of magnetic materials undergoing different magnetic and topological phases during pressure loading, is investigated. By considering both out-of-plane ferromagnetic and in-plane antiferromagnetic components, it is discovered that the calculated results fit well with the experimental data. The calculation results further reveal a pristine Weyl phase with four additional pairs of Weyl nodes under low pressure, and a generally defined Z 2 topological insulator phase after the restoration of time-reversal symmetry at 40.4 GPa. The transport measurements performed at 5 K reveal that the magnetic order almost vanishes at 40.3 GPa, which is consistent with the theoretical prediction. Moreover, the present magneto-TPT involves the degeneration of a pair of crossing bands of two spin channels. Hence, all the chiral Weyl nodes annihilate with their counterparts from another spin channel, in contrast to the typical intraband annihilation of Weyl pairs in inversion-asymmetric systems. The study reveals a method for realizing diverse topological states by modulating exchange splitting by external physical knobs such as pressure in topological magnets.

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“…In Co3Sn2S2 bulk single crystals, large intrinsic anomalous Hall conductivity and anomalous Hall angle have been detected [1,2]. In the two-dimensional (2D) limit, theoretical studies have predicted that the desired high-temperature QAHE could be realized [8][9][10], which has been indicated experimentally by the observation of chiral edge states in a recent STM measurement [11]. In addition, regardless of the specific types of magnetic domain walls, there may exist a large magnetoresistance (MR) that can be retained against the finite strength of the disorder in Co3Sn2S2 [10].…”

Section: Introductionmentioning

confidence: 99%

On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

Zeng

Shi

et al. 2021

Sci. China Phys. Mech. Astron.

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Magnetic topological materials, which combine magnetism and topology, are expected to host emerging topological states and exotic quantum phenomena. In this study, with the aid of greatly enhanced coercive fields in high-quality nanoflakes of the magnetic Weyl semimetal Co 3 Sn 2 S 2 , we investigate anomalous electronic transport properties that are difficult to reveal in bulk Co 3 Sn 2 S 2 or other magnetic materials. When the magnetization is antiparallel to the applied magnetic field, the low longitudinal resistance state occurs, which is in sharp contrast to the high resistance state for the parallel case. Meanwhile, an exceptional Hall component that can be up to three times larger than conventional anomalous Hall resistivity is also observed for transverse transport. These anomalous transport behaviors can be further understood by considering nonlinear magnetic textures and the chiral magnetic field associated with Weyl fermions, extending the longitudinal and transverse transport physics and providing novel degrees of freedom in the spintronic applications of emerging topological magnets.

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Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2

Cited by 56 publications

References 44 publications

Progress and prospects in magnetic topological materials

Progress and prospects in magnetic topological materials

Pressure‐Driven Magneto‐Topological Phase Transition in a Magnetic Weyl Semimetal

On the anomalous low-resistance state and exceptional Hall component in hard-magnetic Weyl nanoflakes

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