Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2

被引:555
作者
Morali, Noam [1 ]
Batabyal, Rajib [1 ]
Nag, Pranab Kumar [1 ]
Liu, Enke [2 ,3 ]
Xu, Qiunan [2 ]
Sun, Yan [2 ]
Yan, Binghai [1 ]
Felser, Claudia [2 ,4 ,5 ]
Avraham, Nurit [1 ]
Beidenkopf, Haim [1 ]
机构
[1] Weizmann Inst Sci, Dept Condensed Matter Phys, IL-7610001 Rehovot, Israel
[2] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany
[3] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
[4] Harvard Univ, John A Paulson Sch Engn & Appl Sci, Cambridge, MA 02138 USA
[5] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
基金
中国国家自然科学基金; 欧洲研究理事会; 国家重点研发计划;
关键词
D O I
10.1126/science.aav2334
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Bulk-surface correspondence in Weyl semimetals ensures the formation of topological " Fermi arc" surface bands whose existence is guaranteed by bulk Weyl nodes. By investigating three distinct surface terminations of the ferromagnetic semimetal Co3Sn2S2, we verify spectroscopically its classification as a time-reversal symmetry-broken Weyl semimetal. We show that the distinct surface potentials imposed by three different terminations modify the Fermi-arc contour and Weyl node connectivity. On the tin (Sn) surface, we identify intra-Brillouin zone Weyl node connectivity of Fermi arcs, whereas on cobalt (Co) termination, the connectivity is across adjacent Brillouin zones. On the sulfur (S) surface, Fermi arcs overlap with nontopological bulk and surface states. We thus resolve both topologically protected and nonprotected electronic properties of a Weyl semimetal.
引用
收藏
页码:1286 / +
页数:25
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