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Direct observation of six-fold exotic fermions in topological semimetal PdSb$_2$
- Source :
- Phys. Rev. B 101, 155114 (2020)
- Publication Year :
- 2019
-
Abstract
- Pyrite-type PdSb$_2$ with a nonsymmorphic cubic structure has been predicted to host six-fold-degenerate exotic fermions beyond the Dirac and Weyl fermions. Though magnetotransport measurements on PdSb$_2$ suggest its topologically nontrivial character, direct spectroscpic study of its band structure remains absent. Here, by utilizing high-resolution angle-resolved photoemission spectroscopy, we present a systematic study on its bulk and surface electronic structure. Through careful comparison with first-principles calculations, we verify the existence of six-fold fermions in PdSb$_2$, which are formed by three doubly degenerate bands centered at the $R$ point in the Brillouin zone. These bands exhibit parabolic dispersion close to six-fold fermion nodes, in sharp contrast to previously reported ones in chiral fermion materials. Furthermore, our data reveal no protected Fermi arcs in PdSb$_2$, which is compatible with its achiral structure. Our findings provide a remarkable platform for study of new topological fermions and indicate their potential applications.
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 101, 155114 (2020)
- Publication Type :
- Report
- Accession number :
- edsarx.1912.00346
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.101.155114