@article{069c0a017b1d481098a73106f40956cc,
title = "Visualizing Higher-Fold Topology in Chiral Crystals",
abstract = "Novel topological phases of matter are fruitful platforms for the discovery of unconventional electromagnetic phenomena. Higher-fold topology is one example, where the low-energy description goes beyond standard model analogs. Despite intensive experimental studies, conclusive evidence remains elusive for the multigap topological nature of higher-fold chiral fermions. In this Letter, we leverage a combination of fine-tuned chemical engineering and photoemission spectroscopy with photon energy contrast to discover the higher-fold topology of a chiral crystal. We identify all bulk branches of a higher-fold chiral fermion for the first time, critically important for allowing us to explore unique Fermi arc surface states in multiple interband gaps, which exhibit an emergent ladder structure. Through designer chemical gating of the samples in combination with our measurements, we uncover an unprecedented multigap bulk boundary correspondence. Our demonstration of multigap electronic topology will propel future research on unconventional topological responses.",
author = "Cochran, {Tyler A.} and Ilya Belopolski and Kaustuv Manna and Mohammad Yahyavi and Yiyuan Liu and Sanchez, {Daniel S.} and Cheng, {Zi Jia} and Yang, {Xian P.} and Daniel Multer and Yin, {Jia Xin} and Horst Borrmann and Alla Chikina and Krieger, {Jonas A.} and Jaime S{\'a}nchez-Barriga and {Le F{\`e}vre}, Patrick and Fran{\c c}ois Bertran and Strocov, {Vladimir N.} and Denlinger, {Jonathan D.} and Chang, {Tay Rong} and Shuang Jia and Claudia Felser and Hsin Lin and Guoqing Chang and Hasan, {M. Zahid}",
note = "Funding Information: The authors acknowledge Songtian S. Zhang and Nana Shumiya for useful conversations during manuscript preparations. The authors also acknowledge Takayuki Muro for beamline support at SPring-8 BL25SU. Work at Princeton University and Princeton-led synchrotron based ARPES measurements were supported by the United States Department of Energy (US DOE) under the Basic Energy Sciences program (Grant No. DOE/BES DE-FG-02-05ER46200). This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. Synchrotron radiation experiments were performed at the BL25SU of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2018A1684 and No. 2019A1696). We acknowledge the Paul Scherrer Institut, Villigen, Switzerland, for provision of synchrotron radiation beamtime at the ADRESS beamline of the Swiss Light Source. We acknowledge SOLEIL for provision of synchrotron radiation facilities at the CASSIOP{\'E}E beamline. Additional ARPES measurements were performed at the RGBL-2 end station at the U125/2 undulator beamline of BESSY II. T. A. C. was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1656466. J. S.-B. gratefully acknowledges financial support from the Impuls-und Vernetzungsfonds der Helmholtz-Gemeinschaft under Grant No. HRSF-0067. K. M. and C. F. thank the European Research Council (ERC) for financial support with Advanced Grant No. (742068) “TOP-MAT”. J. A. K. acknowledges support from the Swiss National Science Foundation (SNF-Grant No. 200021_165910). The work at Nanyang Technological University is supported by the National Research Foundation, Singapore, under its NRF Fellowship Award (NRF-NRFF13-2021-0010) and the Nanyang Assistant Professorship grant from Nanyang Technological University. K. M. acknowledges the Department of Atomic Energy (DAE), Government of India, for the funding support via the Young Scientist{\textquoteright}s Research Award (YSRA) via Grant No. 58/20/03/2021-BRNS/37084 and the Max Planck Society for the funding support under the Max Planck–India partner group project. Publisher Copyright: {\textcopyright} 2023 us. ",
year = "2023",
month = feb,
day = "10",
doi = "10.1103/PhysRevLett.130.066402",
language = "English (US)",
volume = "130",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "6",
}