Visualizing Higher-Fold Topology in Chiral Crystals

Tyler A. Cochran, Ilya Belopolski, Kaustuv Manna, Mohammad Yahyavi, Yiyuan Liu, Daniel S. Sanchez, Zi Jia Cheng, Xian P. Yang, Daniel Multer, Jia Xin Yin, Horst Borrmann, Alla Chikina, Jonas A. Krieger, Jaime Sánchez-Barriga, Patrick Le Fèvre, François Bertran, Vladimir N. Strocov, Jonathan D. Denlinger, Tay Rong Chang, Shuang JiaClaudia Felser, Hsin Lin, Guoqing Chang, M. Zahid Hasan

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


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.

Original languageEnglish (US)
Article number066402
JournalPhysical review letters
Issue number6
StatePublished - Feb 10 2023

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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