Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet

Ilya Belopolski, Kaustuv Manna, Daniel S. Sanchez, Guoqing Chang, Benedikt Ernst, Jiaxin Yin, Songtian S. Zhang, Tyler Cochran, Nana Shumiya, Hao Zheng, Bahadur Singh, Guang Bian, Daniel Multer, Maksim Litskevich, Xiaoting Zhou, Shin Ming Huang, Baokai Wang, Tay Rong Chang, Su Yang Xu, Arun BansilClaudia Felser, Hsin Lin, M. Zahid Hasan

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.

Original languageEnglish
Pages (from-to)1278-1281
Number of pages4
JournalScience
Volume365
Issue number6459
DOIs
Publication statusPublished - 2019 Sep 20

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magnets
topology
fermions
room temperature
electronics
photoelectric emission
curvature
wave functions
spectroscopy
electrons

All Science Journal Classification (ASJC) codes

  • General

Cite this

Belopolski, I., Manna, K., Sanchez, D. S., Chang, G., Ernst, B., Yin, J., ... Zahid Hasan, M. (2019). Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. Science, 365(6459), 1278-1281. https://doi.org/10.1126/science.aav2327
Belopolski, Ilya ; Manna, Kaustuv ; Sanchez, Daniel S. ; Chang, Guoqing ; Ernst, Benedikt ; Yin, Jiaxin ; Zhang, Songtian S. ; Cochran, Tyler ; Shumiya, Nana ; Zheng, Hao ; Singh, Bahadur ; Bian, Guang ; Multer, Daniel ; Litskevich, Maksim ; Zhou, Xiaoting ; Huang, Shin Ming ; Wang, Baokai ; Chang, Tay Rong ; Xu, Su Yang ; Bansil, Arun ; Felser, Claudia ; Lin, Hsin ; Zahid Hasan, M. / Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. In: Science. 2019 ; Vol. 365, No. 6459. pp. 1278-1281.
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abstract = "Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.",
author = "Ilya Belopolski and Kaustuv Manna and Sanchez, {Daniel S.} and Guoqing Chang and Benedikt Ernst and Jiaxin Yin and Zhang, {Songtian S.} and Tyler Cochran and Nana Shumiya and Hao Zheng and Bahadur Singh and Guang Bian and Daniel Multer and Maksim Litskevich and Xiaoting Zhou and Huang, {Shin Ming} and Baokai Wang and Chang, {Tay Rong} and Xu, {Su Yang} and Arun Bansil and Claudia Felser and Hsin Lin and {Zahid Hasan}, M.",
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Belopolski, I, Manna, K, Sanchez, DS, Chang, G, Ernst, B, Yin, J, Zhang, SS, Cochran, T, Shumiya, N, Zheng, H, Singh, B, Bian, G, Multer, D, Litskevich, M, Zhou, X, Huang, SM, Wang, B, Chang, TR, Xu, SY, Bansil, A, Felser, C, Lin, H & Zahid Hasan, M 2019, 'Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet', Science, vol. 365, no. 6459, pp. 1278-1281. https://doi.org/10.1126/science.aav2327

Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. / Belopolski, Ilya; Manna, Kaustuv; Sanchez, Daniel S.; Chang, Guoqing; Ernst, Benedikt; Yin, Jiaxin; Zhang, Songtian S.; Cochran, Tyler; Shumiya, Nana; Zheng, Hao; Singh, Bahadur; Bian, Guang; Multer, Daniel; Litskevich, Maksim; Zhou, Xiaoting; Huang, Shin Ming; Wang, Baokai; Chang, Tay Rong; Xu, Su Yang; Bansil, Arun; Felser, Claudia; Lin, Hsin; Zahid Hasan, M.

In: Science, Vol. 365, No. 6459, 20.09.2019, p. 1278-1281.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet

AU - Belopolski, Ilya

AU - Manna, Kaustuv

AU - Sanchez, Daniel S.

AU - Chang, Guoqing

AU - Ernst, Benedikt

AU - Yin, Jiaxin

AU - Zhang, Songtian S.

AU - Cochran, Tyler

AU - Shumiya, Nana

AU - Zheng, Hao

AU - Singh, Bahadur

AU - Bian, Guang

AU - Multer, Daniel

AU - Litskevich, Maksim

AU - Zhou, Xiaoting

AU - Huang, Shin Ming

AU - Wang, Baokai

AU - Chang, Tay Rong

AU - Xu, Su Yang

AU - Bansil, Arun

AU - Felser, Claudia

AU - Lin, Hsin

AU - Zahid Hasan, M.

PY - 2019/9/20

Y1 - 2019/9/20

N2 - Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.

AB - Topological matter is known to exhibit unconventional surface states and anomalous transport owing to unusual bulk electronic topology. In this study, we use photoemission spectroscopy and quantum transport to elucidate the topology of the room temperature magnet Co2MnGa. We observe sharp bulk Weyl fermion line dispersions indicative of nontrivial topological invariants present in the magnetic phase. On the surface of the magnet, we observe electronic wave functions that take the form of drumheads, enabling us to directly visualize the crucial components of the bulk-boundary topological correspondence. By considering the Berry curvature field associated with the observed topological Weyl fermion lines, we quantitatively account for the giant anomalous Hall response observed in this magnet. Our experimental results suggest a rich interplay of strongly interacting electrons and topology in quantum matter.

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U2 - 10.1126/science.aav2327

DO - 10.1126/science.aav2327

M3 - Article

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VL - 365

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JO - Science

JF - Science

SN - 0036-8075

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Belopolski I, Manna K, Sanchez DS, Chang G, Ernst B, Yin J et al. Discovery of topological Weyl fermion lines and drumhead surface states in a room temperature magnet. Science. 2019 Sep 20;365(6459):1278-1281. https://doi.org/10.1126/science.aav2327