Takane, Daichi, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Souma, Seigo, Nakayama, Kosuke, Nakamura, Takechika, Oinuma, Hikaru, Nakata, Yuki, Iwasawa, Hideaki ORCID: 0000-0001-6760-4085, Cacho, Cephise ORCID: 0000-0002-0058-5817, Kim, Timur ORCID: 0000-0003-4201-4462, Horiba, Koji ORCID: 0000-0002-1124-0451, Kumigashira, Hiroshi, Takahashi, Takashi, Ando, Yoichi ORCID: 0000-0002-3553-3355 and Sato, Takafumi ORCID: 0000-0002-4544-5463 (2019). Observation of Chiral Fermions with a Large Topological Charge and Associated Fermi-Arc Surface States in CoSi. Phys. Rev. Lett., 122 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

Topological semimetals materialize a new state of quantum matter where massless fermions protected by a specific crystal symmetry host exotic quantum phenomena. Distinct from well-known Dirac and Weyl fermions, structurally chiral topological semimetals are predicted to host new types of massless fermions characterized by a large topological charge, whereas such exotic fermions are yet to be experimentally established. Here, by using angle-resolved photoemission spectroscopy, we experimentally demonstrate that a transition-metal silicide CoSi hosts two types of chiral topological fermions, a spin-1 chiral fermion and a double Weyl fermion, in the center and corner of the bulk Brillouin zone, respectively. Intriguingly, we found that the bulk Fermi surfaces are purely composed of the energy bands related to these fermions. We also find the surface states connecting the Fermi surfaces associated with these fermions, suggesting the existence of the predicted Fermi-arc surface states. Our result provides the first experimental evidence for the chiral topological fermions beyond Dirac and Weyl fermions in condensed-matter systems, and paves the pathway toward realizing exotic electronic properties associated with unconventional chiral fermions.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Takane, DaichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, ZhiweiUNSPECIFIEDorcid.org/0000-0003-0182-2471UNSPECIFIED
Souma, SeigoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakayama, KosukeUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakamura, TakechikaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Oinuma, HikaruUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakata, YukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Iwasawa, HideakiUNSPECIFIEDorcid.org/0000-0001-6760-4085UNSPECIFIED
Cacho, CephiseUNSPECIFIEDorcid.org/0000-0002-0058-5817UNSPECIFIED
Kim, TimurUNSPECIFIEDorcid.org/0000-0003-4201-4462UNSPECIFIED
Horiba, KojiUNSPECIFIEDorcid.org/0000-0002-1124-0451UNSPECIFIED
Kumigashira, HiroshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takahashi, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YoichiUNSPECIFIEDorcid.org/0000-0002-3553-3355UNSPECIFIED
Sato, TakafumiUNSPECIFIEDorcid.org/0000-0002-4544-5463UNSPECIFIED
URN: urn:nbn:de:hbz:38-156447
DOI: 10.1103/PhysRevLett.122.076402
Journal or Publication Title: Phys. Rev. Lett.
Volume: 122
Number: 7
Date: 2019
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1079-7114
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
MAJORANA FERMIONS; SEMIMETAL; SUPERCONDUCTOR; DISCOVERYMultiple languages
Physics, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15644

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