Detecting Semimetal Surface Modes in Kitaev Spin Liquids

Raman scattering is a useful probe for “Kitaev-type" spin liquids because it couples only to the dispersing (and potentially gapless) fermionic degrees of freedom in these systems. I will discuss Raman scattering in Kitaev spin liquids on the 3D hyperhoneycomb (\mathcal{H}-0) lattice, where these fermionic degrees of freedom realize topologically non-trivial band structures with protected gapless surface states. I will describe Raman signatures both of bulk 3D samples, and thin-film samples of these materials, where the resonant Raman response can detect the protected surface modes.