TY - JOUR
T1 - Observation of inverted band structure in the topological Dirac semimetal candidate CaAuAs
AU - Nakayama, Kosuke
AU - Wang, Zhiwei
AU - Takane, Daichi
AU - Souma, Seigo
AU - Kubota, Yuya
AU - Nakata, Yuki
AU - Cacho, Cephise
AU - Kim, Timur
AU - Ekahana, Sandy Adhitia
AU - Shi, Ming
AU - Kitamura, Miho
AU - Horiba, Koji
AU - Kumigashira, Hiroshi
AU - Takahashi, Takashi
AU - Ando, Yoichi
AU - Sato, Takafumi
N1 - Funding Information:
We thank K. Sugawara, K. Hori, and T. Kato for their assistance in the ARPES measurements. We also thank Diamond Light Source for access to beamline I05 (Proposal No. SI23799), KEK-PF for beamline BL2A (Proposals No. 2018S2-001 and No. 2018G-653), and Swiss Light Source for beamline SIS X09LA (Proposal No. 20181888). This work is supported by JST-PRESTO (No. JPMJPR18L7), JST-CREST (No. JPMJCR18T1), Grant-in-Aid for Scientific Research on Innovative Areas “Topological Materials Science” (JSPS KAKENHI Grants No. JP15H05853 and No. JP15K21717), Grant-in-Aid for Scientific Research (JSPS KAKENHI Grants No. JP17H01139, No. JP18H04472, No. JP18H01160, and No. JP17H04847), Grant-in-Aid for JSPS Research Fellow (No. JP18J20058), and the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - Project No. 277146847 - CRC 1238 (Subproject No. A04).
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/7/15
Y1 - 2020/7/15
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.102.041104
DO - 10.1103/PhysRevB.102.041104
M3 - Article
AN - SCOPUS:85088520975
SN - 2469-9950
VL - 102
JO - Physical Review B
JF - Physical Review B
IS - 4
M1 - 041104
ER -