This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface
Quantum materials governed by emergent topological fermions have become a cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e quantum matter, and Dirac fermions in magnetic topological insulators enabled the discovery of the quantum anomalous Hall effect. In contrast,...
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creator | Belopolski, Ilya Watanabe, Ryota Sato, Yuki Yoshimi, Ryutaro Kawamura, Minoru Nagahama, Soma Zhao, Yilin Shao, Sen Jin, Yuanjun Kato, Yoshihiro Okamura, Yoshihiro Zhang, Xiao-Xiao Fujishiro, Yukako Takahashi, Youtarou Hirschberger, Max Tsukazaki, Atsushi Takahashi, Kei S Chiu, Ching-Kai Chang, Guoqing Kawasaki, Masashi Nagaosa, Naoto Tokura, Yoshinori |
description | Quantum materials governed by emergent topological fermions have become a
cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e
quantum matter, and Dirac fermions in magnetic topological insulators enabled
the discovery of the quantum anomalous Hall effect. In contrast, there are few
materials whose electromagnetic response is dominated by emergent Weyl
fermions. Nearly all known Weyl materials are overwhelmingly metallic, and are
largely governed by irrelevant, conventional electrons. Here we theoretically
predict and experimentally observe a semimetallic Weyl ferromagnet in van der
Waals (Cr,Bi)$_2$Te$_3$. In transport, we find a record bulk anomalous Hall
angle $> 0.5$ along with non-metallic conductivity, a regime sharply distinct
from conventional ferromagnets. Together with symmetry analysis, our data
suggest a semimetallic Fermi surface composed of two Weyl points, with a giant
separation $> 75\%$ of the linear dimension of the bulk Brillouin zone, and no
other electronic states. Using state-of-the-art crystal synthesis techniques,
we widely tune the electronic structure, allowing us to annihilate the Weyl
state and visualize a unique topological phase diagram exhibiting broad Chern
insulating, Weyl semimetallic and magnetic semiconducting regions. Our
observation of a semimetallic Weyl ferromagnet offers an avenue toward novel
correlated states and non-linear phenomena, as well as zero-magnetic-field Weyl
spintronic and optical devices. |
doi_str_mv | 10.48550/arxiv.2411.04179 |
format | Article |
fullrecord | <record><control><sourceid>arxiv_GOX</sourceid><recordid>TN_cdi_arxiv_primary_2411_04179</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>2411_04179</sourcerecordid><originalsourceid>FETCH-arxiv_primary_2411_041793</originalsourceid><addsrcrecordid>eNqFjk0KwjAQRrNxIeoBXDkXsDa2xZ-tWDxAQXBThjKxg0lTklTt7a3FvasP3vcWT4iljKN0n2XxBt2bn9E2lTKKU7k7TMWtqNlDsPYBnQeEK_X6CL5vQk1-eKwaoCfDhgJqzdVogCLnrMF7QwFeHGpoLTcBcnKGwXdOYUVzMVGoPS1-OxOr_FycLuuxomwdG3R9-a0px5rkv_EBk0lANA</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype></control><display><type>article</type><title>This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface</title><source>arXiv.org</source><creator>Belopolski, Ilya ; Watanabe, Ryota ; Sato, Yuki ; Yoshimi, Ryutaro ; Kawamura, Minoru ; Nagahama, Soma ; Zhao, Yilin ; Shao, Sen ; Jin, Yuanjun ; Kato, Yoshihiro ; Okamura, Yoshihiro ; Zhang, Xiao-Xiao ; Fujishiro, Yukako ; Takahashi, Youtarou ; Hirschberger, Max ; Tsukazaki, Atsushi ; Takahashi, Kei S ; Chiu, Ching-Kai ; Chang, Guoqing ; Kawasaki, Masashi ; Nagaosa, Naoto ; Tokura, Yoshinori</creator><creatorcontrib>Belopolski, Ilya ; Watanabe, Ryota ; Sato, Yuki ; Yoshimi, Ryutaro ; Kawamura, Minoru ; Nagahama, Soma ; Zhao, Yilin ; Shao, Sen ; Jin, Yuanjun ; Kato, Yoshihiro ; Okamura, Yoshihiro ; Zhang, Xiao-Xiao ; Fujishiro, Yukako ; Takahashi, Youtarou ; Hirschberger, Max ; Tsukazaki, Atsushi ; Takahashi, Kei S ; Chiu, Ching-Kai ; Chang, Guoqing ; Kawasaki, Masashi ; Nagaosa, Naoto ; Tokura, Yoshinori</creatorcontrib><description>Quantum materials governed by emergent topological fermions have become a
cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e
quantum matter, and Dirac fermions in magnetic topological insulators enabled
the discovery of the quantum anomalous Hall effect. In contrast, there are few
materials whose electromagnetic response is dominated by emergent Weyl
fermions. Nearly all known Weyl materials are overwhelmingly metallic, and are
largely governed by irrelevant, conventional electrons. Here we theoretically
predict and experimentally observe a semimetallic Weyl ferromagnet in van der
Waals (Cr,Bi)$_2$Te$_3$. In transport, we find a record bulk anomalous Hall
angle $> 0.5$ along with non-metallic conductivity, a regime sharply distinct
from conventional ferromagnets. Together with symmetry analysis, our data
suggest a semimetallic Fermi surface composed of two Weyl points, with a giant
separation $> 75\%$ of the linear dimension of the bulk Brillouin zone, and no
other electronic states. Using state-of-the-art crystal synthesis techniques,
we widely tune the electronic structure, allowing us to annihilate the Weyl
state and visualize a unique topological phase diagram exhibiting broad Chern
insulating, Weyl semimetallic and magnetic semiconducting regions. Our
observation of a semimetallic Weyl ferromagnet offers an avenue toward novel
correlated states and non-linear phenomena, as well as zero-magnetic-field Weyl
spintronic and optical devices.</description><identifier>DOI: 10.48550/arxiv.2411.04179</identifier><language>eng</language><subject>Physics - Materials Science ; Physics - Mesoscale and Nanoscale Physics</subject><creationdate>2024-11</creationdate><rights>http://creativecommons.org/licenses/by/4.0</rights><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>228,230,780,885</link.rule.ids><linktorsrc>$$Uhttps://arxiv.org/abs/2411.04179$$EView_record_in_Cornell_University$$FView_record_in_$$GCornell_University$$Hfree_for_read</linktorsrc><backlink>$$Uhttps://doi.org/10.48550/arXiv.2411.04179$$DView paper in arXiv$$Hfree_for_read</backlink></links><search><creatorcontrib>Belopolski, Ilya</creatorcontrib><creatorcontrib>Watanabe, Ryota</creatorcontrib><creatorcontrib>Sato, Yuki</creatorcontrib><creatorcontrib>Yoshimi, Ryutaro</creatorcontrib><creatorcontrib>Kawamura, Minoru</creatorcontrib><creatorcontrib>Nagahama, Soma</creatorcontrib><creatorcontrib>Zhao, Yilin</creatorcontrib><creatorcontrib>Shao, Sen</creatorcontrib><creatorcontrib>Jin, Yuanjun</creatorcontrib><creatorcontrib>Kato, Yoshihiro</creatorcontrib><creatorcontrib>Okamura, Yoshihiro</creatorcontrib><creatorcontrib>Zhang, Xiao-Xiao</creatorcontrib><creatorcontrib>Fujishiro, Yukako</creatorcontrib><creatorcontrib>Takahashi, Youtarou</creatorcontrib><creatorcontrib>Hirschberger, Max</creatorcontrib><creatorcontrib>Tsukazaki, Atsushi</creatorcontrib><creatorcontrib>Takahashi, Kei S</creatorcontrib><creatorcontrib>Chiu, Ching-Kai</creatorcontrib><creatorcontrib>Chang, Guoqing</creatorcontrib><creatorcontrib>Kawasaki, Masashi</creatorcontrib><creatorcontrib>Nagaosa, Naoto</creatorcontrib><creatorcontrib>Tokura, Yoshinori</creatorcontrib><title>This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface</title><description>Quantum materials governed by emergent topological fermions have become a
cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e
quantum matter, and Dirac fermions in magnetic topological insulators enabled
the discovery of the quantum anomalous Hall effect. In contrast, there are few
materials whose electromagnetic response is dominated by emergent Weyl
fermions. Nearly all known Weyl materials are overwhelmingly metallic, and are
largely governed by irrelevant, conventional electrons. Here we theoretically
predict and experimentally observe a semimetallic Weyl ferromagnet in van der
Waals (Cr,Bi)$_2$Te$_3$. In transport, we find a record bulk anomalous Hall
angle $> 0.5$ along with non-metallic conductivity, a regime sharply distinct
from conventional ferromagnets. Together with symmetry analysis, our data
suggest a semimetallic Fermi surface composed of two Weyl points, with a giant
separation $> 75\%$ of the linear dimension of the bulk Brillouin zone, and no
other electronic states. Using state-of-the-art crystal synthesis techniques,
we widely tune the electronic structure, allowing us to annihilate the Weyl
state and visualize a unique topological phase diagram exhibiting broad Chern
insulating, Weyl semimetallic and magnetic semiconducting regions. Our
observation of a semimetallic Weyl ferromagnet offers an avenue toward novel
correlated states and non-linear phenomena, as well as zero-magnetic-field Weyl
spintronic and optical devices.</description><subject>Physics - Materials Science</subject><subject>Physics - Mesoscale and Nanoscale Physics</subject><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><sourceid>GOX</sourceid><recordid>eNqFjk0KwjAQRrNxIeoBXDkXsDa2xZ-tWDxAQXBThjKxg0lTklTt7a3FvasP3vcWT4iljKN0n2XxBt2bn9E2lTKKU7k7TMWtqNlDsPYBnQeEK_X6CL5vQk1-eKwaoCfDhgJqzdVogCLnrMF7QwFeHGpoLTcBcnKGwXdOYUVzMVGoPS1-OxOr_FycLuuxomwdG3R9-a0px5rkv_EBk0lANA</recordid><startdate>20241106</startdate><enddate>20241106</enddate><creator>Belopolski, Ilya</creator><creator>Watanabe, Ryota</creator><creator>Sato, Yuki</creator><creator>Yoshimi, Ryutaro</creator><creator>Kawamura, Minoru</creator><creator>Nagahama, Soma</creator><creator>Zhao, Yilin</creator><creator>Shao, Sen</creator><creator>Jin, Yuanjun</creator><creator>Kato, Yoshihiro</creator><creator>Okamura, Yoshihiro</creator><creator>Zhang, Xiao-Xiao</creator><creator>Fujishiro, Yukako</creator><creator>Takahashi, Youtarou</creator><creator>Hirschberger, Max</creator><creator>Tsukazaki, Atsushi</creator><creator>Takahashi, Kei S</creator><creator>Chiu, Ching-Kai</creator><creator>Chang, Guoqing</creator><creator>Kawasaki, Masashi</creator><creator>Nagaosa, Naoto</creator><creator>Tokura, Yoshinori</creator><scope>GOX</scope></search><sort><creationdate>20241106</creationdate><title>This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface</title><author>Belopolski, Ilya ; Watanabe, Ryota ; Sato, Yuki ; Yoshimi, Ryutaro ; Kawamura, Minoru ; Nagahama, Soma ; Zhao, Yilin ; Shao, Sen ; Jin, Yuanjun ; Kato, Yoshihiro ; Okamura, Yoshihiro ; Zhang, Xiao-Xiao ; Fujishiro, Yukako ; Takahashi, Youtarou ; Hirschberger, Max ; Tsukazaki, Atsushi ; Takahashi, Kei S ; Chiu, Ching-Kai ; Chang, Guoqing ; Kawasaki, Masashi ; Nagaosa, Naoto ; Tokura, Yoshinori</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-arxiv_primary_2411_041793</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>Physics - Materials Science</topic><topic>Physics - Mesoscale and Nanoscale Physics</topic><toplevel>online_resources</toplevel><creatorcontrib>Belopolski, Ilya</creatorcontrib><creatorcontrib>Watanabe, Ryota</creatorcontrib><creatorcontrib>Sato, Yuki</creatorcontrib><creatorcontrib>Yoshimi, Ryutaro</creatorcontrib><creatorcontrib>Kawamura, Minoru</creatorcontrib><creatorcontrib>Nagahama, Soma</creatorcontrib><creatorcontrib>Zhao, Yilin</creatorcontrib><creatorcontrib>Shao, Sen</creatorcontrib><creatorcontrib>Jin, Yuanjun</creatorcontrib><creatorcontrib>Kato, Yoshihiro</creatorcontrib><creatorcontrib>Okamura, Yoshihiro</creatorcontrib><creatorcontrib>Zhang, Xiao-Xiao</creatorcontrib><creatorcontrib>Fujishiro, Yukako</creatorcontrib><creatorcontrib>Takahashi, Youtarou</creatorcontrib><creatorcontrib>Hirschberger, Max</creatorcontrib><creatorcontrib>Tsukazaki, Atsushi</creatorcontrib><creatorcontrib>Takahashi, Kei S</creatorcontrib><creatorcontrib>Chiu, Ching-Kai</creatorcontrib><creatorcontrib>Chang, Guoqing</creatorcontrib><creatorcontrib>Kawasaki, Masashi</creatorcontrib><creatorcontrib>Nagaosa, Naoto</creatorcontrib><creatorcontrib>Tokura, Yoshinori</creatorcontrib><collection>arXiv.org</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>Belopolski, Ilya</au><au>Watanabe, Ryota</au><au>Sato, Yuki</au><au>Yoshimi, Ryutaro</au><au>Kawamura, Minoru</au><au>Nagahama, Soma</au><au>Zhao, Yilin</au><au>Shao, Sen</au><au>Jin, Yuanjun</au><au>Kato, Yoshihiro</au><au>Okamura, Yoshihiro</au><au>Zhang, Xiao-Xiao</au><au>Fujishiro, Yukako</au><au>Takahashi, Youtarou</au><au>Hirschberger, Max</au><au>Tsukazaki, Atsushi</au><au>Takahashi, Kei S</au><au>Chiu, Ching-Kai</au><au>Chang, Guoqing</au><au>Kawasaki, Masashi</au><au>Nagaosa, Naoto</au><au>Tokura, Yoshinori</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface</atitle><date>2024-11-06</date><risdate>2024</risdate><abstract>Quantum materials governed by emergent topological fermions have become a
cornerstone of physics. Dirac fermions in graphene form the basis for moir\'e
quantum matter, and Dirac fermions in magnetic topological insulators enabled
the discovery of the quantum anomalous Hall effect. In contrast, there are few
materials whose electromagnetic response is dominated by emergent Weyl
fermions. Nearly all known Weyl materials are overwhelmingly metallic, and are
largely governed by irrelevant, conventional electrons. Here we theoretically
predict and experimentally observe a semimetallic Weyl ferromagnet in van der
Waals (Cr,Bi)$_2$Te$_3$. In transport, we find a record bulk anomalous Hall
angle $> 0.5$ along with non-metallic conductivity, a regime sharply distinct
from conventional ferromagnets. Together with symmetry analysis, our data
suggest a semimetallic Fermi surface composed of two Weyl points, with a giant
separation $> 75\%$ of the linear dimension of the bulk Brillouin zone, and no
other electronic states. Using state-of-the-art crystal synthesis techniques,
we widely tune the electronic structure, allowing us to annihilate the Weyl
state and visualize a unique topological phase diagram exhibiting broad Chern
insulating, Weyl semimetallic and magnetic semiconducting regions. Our
observation of a semimetallic Weyl ferromagnet offers an avenue toward novel
correlated states and non-linear phenomena, as well as zero-magnetic-field Weyl
spintronic and optical devices.</abstract><doi>10.48550/arxiv.2411.04179</doi><oa>free_for_read</oa></addata></record> |
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title | This took us a Weyl: synthesis of a semimetallic Weyl ferromagnet with point Fermi surface |
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