Nakayama, Kosuke ORCID: 0000-0003-2462-2253, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Takane, Daichi, Souma, Seigo, Kubota, Yuya, Nakata, Yuki, Cacho, Cephise, Kim, Timur ORCID: 0000-0003-4201-4462, Ekahana, Sandy Adhitia ORCID: 0000-0002-1693-8082, Shi, Ming, Kitamura, Miho, Horiba, Koji, Kumigashira, Hiroshi, Takahashi, Takashi, Ando, Yoichi and Sato, Takafumi ORCID: 0000-0002-4544-5463 (2020). Observation of inverted band structure in the topological Dirac semimetal candidate CaAuAs. Phys. Rev. B, 102 (4). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

We have performed high-resolution angle-resolved photoemission spectroscopy of the ternary pnictide CaAuAs, which is predicted to be a three-dimensional topological Dirac semimetal (TDS). By accurately determining the bulk-band structure, we have revealed the coexistence of three-dimensional and quasi-two-dimensional Fermi surfaces with dominant hole carriers. The band structure around the Brillouin-zone center is characterized by an energy overlap between the hole and electron pockets, in excellent agreement with first-principles band-structure calculations. This indicates the occurrence of bulk-band inversion, supporting the TDS state in CaAuAs. Because of the high tunability in the chemical composition besides the TDS nature, CaAuAs provides a precious opportunity for investigating the quantum phase transition from TDS to other exotic topological phases.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Nakayama, KosukeUNSPECIFIEDorcid.org/0000-0003-2462-2253UNSPECIFIED
Wang, ZhiweiUNSPECIFIEDorcid.org/0000-0003-0182-2471UNSPECIFIED
Takane, DaichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Souma, SeigoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kubota, YuyaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Nakata, YukiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cacho, CephiseUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kim, TimurUNSPECIFIEDorcid.org/0000-0003-4201-4462UNSPECIFIED
Ekahana, Sandy AdhitiaUNSPECIFIEDorcid.org/0000-0002-1693-8082UNSPECIFIED
Shi, MingUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kitamura, MihoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Horiba, KojiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kumigashira, HiroshiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Takahashi, TakashiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ando, YoichiUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sato, TakafumiUNSPECIFIEDorcid.org/0000-0002-4544-5463UNSPECIFIED
URN: urn:nbn:de:hbz:38-326941
DOI: 10.1103/PhysRevB.102.041104
Journal or Publication Title: Phys. Rev. B
Volume: 102
Number: 4
Date: 2020
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 2469-9969
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed MatterMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/32694

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