Magnetic Weyl semimetal phase in a Kagomé crystal

By Defa Liu, A. Liang, Enke Liu, Qiunan Xu, Yiwei Li, Cheng Chen, D. Pei, W. Shi, S. Mo, P. Dudin and 9 more. Science, 2019

787 citations recorded by the source corpus.

Magnetic Weyl semimetals Weyl semimetals (WSMs)—materials that host exotic quasiparticles called Weyl fermions—must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identified, but showing unambiguously that a material is a time-reversal-breaking WSM is tricky. Three groups now provide spectroscopic evidence for this latter state in magnetic materials (see the Perspective by da Silva Neto). Belopolski et al. probed the material Co2MnGa using angle-resolved photoemission spectroscopy, revealing exotic drumhead surface states. Using the same technique, Liu et al. studied the material Co3Sn2S2, which was complemented by the scanning tunneling spectroscopy measurements of Morali et al. These magnetic WSM states provide an ideal setting for exotic transport effects. Science, this issue p. 1278, p. 1282, p. 1286; see also p. 1248 Photoemission and scanning tunneling spectroscopies provide direct evidence for the existence of magnetic Weyl semimetals. Weyl semimetals are crystalline solids that host emergent relativistic Weyl fermions and have characteristic surface Fermi-arcs in their electronic structure. Weyl semimetals with broken time reversal symmetry are difficult to identify unambiguously. In this work, using angle-resolved photoemission spectroscopy, we visualized the electronic structure of the ferromagnetic crystal Co3Sn2S2 and discovered its characteristic surface Fermi-arcs and linear bulk band dispersions across the Weyl points. These results establish Co3Sn2S2 as a magnetic Weyl semimetal that may serve as a platform for realizing phenomena such as chiral magnetic effects, unusually large anomalous Hall effect and quantum anomalous Hall effect.

Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/5cb3b797b9d6856112263ba5cd03b1351808951e

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Atomic and Molecular Physics, and Optics

1. Cheng Guo
2. Bo Zhao
3. V. Asadchy
4. Chaoxing Liu
5. Cui-Zu Chang
6. Yu He
7. Shanhui Fan
8. Mazhar N. Ali

In Condensed Matter Physics

1. Shanhui Fan
2. Cheng Guo
3. Chaoxing Liu
4. Bo Zhao
5. V. Asadchy
6. Zhi-xun Shen
7. Cui-Zu Chang
8. Allan H. MacDonald

In Materials Chemistry

1. Chaoxing Liu
2. Cui-Zu Chang
3. Yu He
4. Shanhui Fan
5. Mazhar N. Ali
6. Cheng Guo
7. Bo Zhao
8. V. Asadchy

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, positive): “…lasers have become competitive and may be poised to supplant Ti:Sapphire as a preferred light source for trARPES systems due to their ability to generate > 100 µJ pulses at repetition rates approaching 1 MHz (Boschini et al., 2014; Liu et al., 2019c; Lorek et al., 2014; Reutzel et al., 2019).”
• Light control with Weyl semimetals (2022, background): “Later, magnetic Weyl semimetals that break time-reversal symmetry have also been discovered [42, 43, 44].”
• Quantum states and intertwining phases in kagome materials (2023, background): “13,14), Dirac points and flat bands in FeSn (ref.”