Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2
Discovery of magnetic Weyl fermions: Dirac fermions split into pairs of Weyl fermions by slow magnetic fluctuations. Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking....
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| Veröffentlicht in: | Science advances 2019-07, Vol.5 (7), p.eaaw4718-eaaw4718 |
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| creator | Ma, J-Z Nie, S M Yi, C J Jandke, J Shang, T Yao, M Y Naamneh, M Yan, L Q Sun, Y Chikina, A Strocov, V N Medarde, M Song, M Xiong, Y-M Xu, G Wulfhekel, W Mesot, J Reticcioli, M Franchini, C Mudry, C Müller, M Shi, Y G Qian, T Ding, H Shi, M |
| description | Discovery of magnetic Weyl fermions: Dirac fermions split into pairs of Weyl fermions by slow magnetic fluctuations.
Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd
2
As
2
. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi–long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought. |
| doi_str_mv | 10.1126/sciadv.aaw4718 |
| format | Article |
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Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd
2
As
2
. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi–long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought.</description><identifier>EISSN: 2375-2548</identifier><identifier>DOI: 10.1126/sciadv.aaw4718</identifier><identifier>PMID: 31309151</identifier><language>eng</language><publisher>American Association for the Advancement of Science</publisher><subject>Physics ; SciAdv r-articles</subject><ispartof>Science advances, 2019-07, Vol.5 (7), p.eaaw4718-eaaw4718</ispartof><rights>Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). 2019 The Authors</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC6625818/pdf/$$EPDF$$P50$$Gpubmedcentral$$Hfree_for_read</linktopdf><linktohtml>$$Uhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC6625818/$$EHTML$$P50$$Gpubmedcentral$$Hfree_for_read</linktohtml><link.rule.ids>230,314,724,777,781,861,882,27905,27906,53772,53774</link.rule.ids></links><search><creatorcontrib>Ma, J-Z</creatorcontrib><creatorcontrib>Nie, S M</creatorcontrib><creatorcontrib>Yi, C J</creatorcontrib><creatorcontrib>Jandke, J</creatorcontrib><creatorcontrib>Shang, T</creatorcontrib><creatorcontrib>Yao, M Y</creatorcontrib><creatorcontrib>Naamneh, M</creatorcontrib><creatorcontrib>Yan, L Q</creatorcontrib><creatorcontrib>Sun, Y</creatorcontrib><creatorcontrib>Chikina, A</creatorcontrib><creatorcontrib>Strocov, V N</creatorcontrib><creatorcontrib>Medarde, M</creatorcontrib><creatorcontrib>Song, M</creatorcontrib><creatorcontrib>Xiong, Y-M</creatorcontrib><creatorcontrib>Xu, G</creatorcontrib><creatorcontrib>Wulfhekel, W</creatorcontrib><creatorcontrib>Mesot, J</creatorcontrib><creatorcontrib>Reticcioli, M</creatorcontrib><creatorcontrib>Franchini, C</creatorcontrib><creatorcontrib>Mudry, C</creatorcontrib><creatorcontrib>Müller, M</creatorcontrib><creatorcontrib>Shi, Y G</creatorcontrib><creatorcontrib>Qian, T</creatorcontrib><creatorcontrib>Ding, H</creatorcontrib><creatorcontrib>Shi, M</creatorcontrib><title>Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2</title><title>Science advances</title><description>Discovery of magnetic Weyl fermions: Dirac fermions split into pairs of Weyl fermions by slow magnetic fluctuations.
Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd
2
As
2
. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi–long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought.</description><subject>Physics</subject><subject>SciAdv r-articles</subject><issn>2375-2548</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNpVjrtrwzAYxEWhNCHN2lljl6R6WJa8FEJIHxDokJaO5rP0OVHwq5ackv--Ls3S6Q7u-N0RcsfZknORPgTrwZ2WAN-J5uaKTIXUaiFUYiZkHsKRMcaTNFU8uyETySXLuOJTstt1vqFlNdg4QPRtQ33jBouOfuK5ogFrX2OE0UWIOIY0HpB20EMN-wajt7Q7QEDalnQzrJ1YBXFLrkuoAs4vOiMfT5v39cti-_b8ul5tF8dxPS7M7wNWGO4KbTLIHC-5ykptBFOGoTZGYAGuSK1EJ4TmmlmnoEyc5KZwhZyRxz9uNxQ1OotN7KHKu97X0J_zFnz-P2n8Id-3pzxNhTLcjID7C6BvvwYMMa99sFhV0GA7hFyMNS1lwpT8ATbbbM0</recordid><startdate>20190712</startdate><enddate>20190712</enddate><creator>Ma, J-Z</creator><creator>Nie, S M</creator><creator>Yi, C J</creator><creator>Jandke, J</creator><creator>Shang, T</creator><creator>Yao, M Y</creator><creator>Naamneh, M</creator><creator>Yan, L Q</creator><creator>Sun, Y</creator><creator>Chikina, A</creator><creator>Strocov, V N</creator><creator>Medarde, M</creator><creator>Song, M</creator><creator>Xiong, Y-M</creator><creator>Xu, G</creator><creator>Wulfhekel, W</creator><creator>Mesot, J</creator><creator>Reticcioli, M</creator><creator>Franchini, C</creator><creator>Mudry, C</creator><creator>Müller, M</creator><creator>Shi, Y G</creator><creator>Qian, T</creator><creator>Ding, H</creator><creator>Shi, M</creator><general>American Association for the Advancement of Science</general><scope>7X8</scope><scope>5PM</scope></search><sort><creationdate>20190712</creationdate><title>Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2</title><author>Ma, J-Z ; Nie, S M ; Yi, C J ; Jandke, J ; Shang, T ; Yao, M Y ; Naamneh, M ; Yan, L Q ; Sun, Y ; Chikina, A ; Strocov, V N ; Medarde, M ; Song, M ; Xiong, Y-M ; Xu, G ; Wulfhekel, W ; Mesot, J ; Reticcioli, M ; Franchini, C ; Mudry, C ; Müller, M ; Shi, Y G ; Qian, T ; Ding, H ; Shi, M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-j309t-891510b81db789a9d1f159f7820580e7882ebadb6c3ed227170cd5af4d318bdb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Physics</topic><topic>SciAdv r-articles</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ma, J-Z</creatorcontrib><creatorcontrib>Nie, S M</creatorcontrib><creatorcontrib>Yi, C J</creatorcontrib><creatorcontrib>Jandke, J</creatorcontrib><creatorcontrib>Shang, T</creatorcontrib><creatorcontrib>Yao, M Y</creatorcontrib><creatorcontrib>Naamneh, M</creatorcontrib><creatorcontrib>Yan, L Q</creatorcontrib><creatorcontrib>Sun, Y</creatorcontrib><creatorcontrib>Chikina, A</creatorcontrib><creatorcontrib>Strocov, V N</creatorcontrib><creatorcontrib>Medarde, M</creatorcontrib><creatorcontrib>Song, M</creatorcontrib><creatorcontrib>Xiong, Y-M</creatorcontrib><creatorcontrib>Xu, G</creatorcontrib><creatorcontrib>Wulfhekel, W</creatorcontrib><creatorcontrib>Mesot, J</creatorcontrib><creatorcontrib>Reticcioli, M</creatorcontrib><creatorcontrib>Franchini, C</creatorcontrib><creatorcontrib>Mudry, C</creatorcontrib><creatorcontrib>Müller, M</creatorcontrib><creatorcontrib>Shi, Y G</creatorcontrib><creatorcontrib>Qian, T</creatorcontrib><creatorcontrib>Ding, H</creatorcontrib><creatorcontrib>Shi, M</creatorcontrib><collection>MEDLINE - Academic</collection><collection>PubMed Central (Full Participant titles)</collection><jtitle>Science advances</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ma, J-Z</au><au>Nie, S M</au><au>Yi, C J</au><au>Jandke, J</au><au>Shang, T</au><au>Yao, M Y</au><au>Naamneh, M</au><au>Yan, L Q</au><au>Sun, Y</au><au>Chikina, A</au><au>Strocov, V N</au><au>Medarde, M</au><au>Song, M</au><au>Xiong, Y-M</au><au>Xu, G</au><au>Wulfhekel, W</au><au>Mesot, J</au><au>Reticcioli, M</au><au>Franchini, C</au><au>Mudry, C</au><au>Müller, M</au><au>Shi, Y G</au><au>Qian, T</au><au>Ding, H</au><au>Shi, M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2</atitle><jtitle>Science advances</jtitle><date>2019-07-12</date><risdate>2019</risdate><volume>5</volume><issue>7</issue><spage>eaaw4718</spage><epage>eaaw4718</epage><pages>eaaw4718-eaaw4718</pages><eissn>2375-2548</eissn><abstract>Discovery of magnetic Weyl fermions: Dirac fermions split into pairs of Weyl fermions by slow magnetic fluctuations.
Weyl fermions as emergent quasiparticles can arise in Weyl semimetals (WSMs) in which the energy bands are nondegenerate, resulting from inversion or time-reversal symmetry breaking. Nevertheless, experimental evidence for magnetically induced WSMs is scarce. Here, using photoemission spectroscopy, we observe that the degeneracy of Bloch bands is already lifted in the paramagnetic phase of EuCd
2
As
2
. We attribute this effect to the itinerant electrons experiencing quasi-static and quasi–long-range ferromagnetic fluctuations. Moreover, the spin-nondegenerate band structure harbors a pair of ideal Weyl nodes near the Fermi level. Hence, we show that long-range magnetic order and the spontaneous breaking of time-reversal symmetry are not essential requirements for WSM states in centrosymmetric systems and that WSM states can emerge in a wider range of condensed matter systems than previously thought.</abstract><pub>American Association for the Advancement of Science</pub><pmid>31309151</pmid><doi>10.1126/sciadv.aaw4718</doi><oa>free_for_read</oa></addata></record> |
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| subjects | Physics SciAdv r-articles |
| title | Spin fluctuation induced Weyl semimetal state in the paramagnetic phase of EuCd2As2 |
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