Topological chiral crystals*

Topological chiral crystals host guaranteed topological crossings in the bulk band structure and can possess Fermi arc surface states that span the entire surface Brillouin zone [1]. These materials can give rise to novel opitcal and magneto-transport response. In this presentation, we discuss recent photoemission experiments exploring the topology of chiral fermions [2]. By combining measurements with ultraviolet and soft x-ray incident photons, we determine the topological invariant directly. Our results shed new light on the relationship between structural chirality and topology.
[1] Sanchez, D. S., Belopolski, I., Cochran, T. A. et al. Nature 567, 500-505 (2019).
[2] Cochran, T. A. et al. (In preparation).