Evidence for magnetic Weyl fermions in a correlated metal.
By K. Kuroda, T. Tomita, Michi-To Suzuki, C. Bareille, A. A. Nugroho, P. Goswami, M. Ochi, M. Ikhlas, M. Nakayama, S. Akebi and 12 more. Nature Materials, 2017
604 citations recorded by the source corpus.
Weyl fermions have been observed as three-dimensional, gapless topological excitations in weakly correlated, inversion-symmetry-breaking semimetals. However, their realization in spontaneously time-reversal-symmetry-breaking phases of strongly correlated materials has so far remained hypothetical. Here, we report experimental evidence for magnetic Weyl fermions in Mn3Sn, a non-collinear antiferromagnet that exhibits a large anomalous Hall effect, even at room temperature. Detailed comparison between angle-resolved photoemission spectroscopy (ARPES) measurements and density functional theory (DFT) calculations reveals significant bandwidth renormalization and damping effects due to the strong correlation among Mn 3d electrons. Magnetotransport measurements provide strong evidence for the chiral anomaly of Weyl fermions-namely, the emergence of positive magnetoconductance only in the presence of parallel electric and magnetic fields. Since weak magnetic fields (approximately 10 mT) are adequate to control the distribution of Weyl points and the large fictitious fields (equivalent to approximately a few hundred T) produced by them in momentum space, our discovery lays the foundation for a new field of science and technology involving the magnetic Weyl excitations of strongly correlated electron systems such as Mn3Sn.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/009195607252e056aa8b8bde7f2323af86176b42
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In Atomic and Molecular Physics, and Optics
- M. Zahid Hasan
- Chaoxing Liu
- Liang Fu
- A. Bostwick
- Allan H. MacDonald
- Eli Rotenberg
- Junwei Liu
- Cui-Zu Chang
In Electronic, Optical and Magnetic Materials
In Materials Chemistry
- M. Zahid Hasan
- Chaoxing Liu
- Liang Fu
- A. Bostwick
- Allan H. MacDonald
- Eli Rotenberg
- Junwei Liu
- Cui-Zu Chang
Citations in the corpus
- Colloquium : Quantum anomalous Hall effect (2022, background): “Following this idea, a number of intrinsic magnetic materials have been proposed, including HgCr2Se4 (Xu et al., 2011), Co3Sn2S2 (Liu et al., 2019a; Morali et al., 2019), Mn2Sn (Kuroda et al., 2017), and Co2MnGa (Belopolski et al., 2019).”
- Angle-resolved photoemission studies of quantum materials (2020, neutral): “The experimental evidence for Weyl semimetals with broken time-reversal symmetry has been more elusive (Kuroda et al., 2017), though recently there was compelling evidence from ARPES and STM that Co3Sn2S2 is a ferromagnetic Weyl semimetal with three pairs of Weyl nodes (Liu et al., 2019a; Morali et…”
- Massive Dirac fermions in a ferromagnetic kagome metal (2017, methodology): “The robustness of this effect is comparable to that driven by chiral antiferromagnetic order in Mn3Sn [11] and Mn3Ge [12], but instead of 3D Weyl nodes [13] is driven by quasi-2D”
- Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5 (2021, background): “For instance, certain kagome magnets are found to exhibit electronic nematicity, giant spin-orbit tunability, and topological Chern quantum phases [3-8].”