We explore the topological electronic band structure of the pyrochlore lattice in the strong spin-orbit coupling regime. Using angle-resolved photoemission spectroscopy, first-principles calculations, and symmetry analysis, we have investigated the bulk electronic structure of RbBi2, which has a Bi pyrochlore network. We observe the presence of 3D massless Dirac fermions enforced by nonsymmorphic symmetry, as well as a 3D quadratic band crossing protected by cubic crystalline symmetry. Furthermore, we identify an additional 3D linear Dirac dispersion associated with band inversion protected by threefold rotation symmetry. These observations reveal the rich band topology of itinerant pyrochlore lattice systems in the strong SOC limit and serve as a starting point to explore correlated topological phases in geometrically frustrated lattices.
Authors
- Dongjin Oh,
- Junha Kang,
- Yuting Qian,
- Shiang Fang,
- Mingu Kang,
- Chris Jozwiak,
- Aaron Bostwick,
- Eli Rotenberg,
- Joseph G. Checkelsky,
- Liang Fu,
- prof. dr hab. inż. Tomasz Klimczuk link open in new tab ,
- dr inż. Michał Winiarski link open in new tab ,
- Bohm-Jung Yang,
- Riccardo Comin
Additional information
- DOI
- Digital Object Identifier link open in new tab 10.1103/physrevb.110.205102
- Category
- Publikacja w czasopiśmie
- Type
- artykuły w czasopismach
- Language
- angielski
- Publication year
- 2024
