Circular photogalvanic effect on topological insulator surfaces: Berry-curvature-dependent response
Circular photogalvanic effect on topological insulator surfaces: Berry-curvature-dependent response
We study theoretically the optical response of the surface states of a topological insulator, especially the generation of helicity-dependent direct current by circularly polarized light. Interestingly, the dominant current, due to an interband transition, is controlled by the Berry curvature of the surface bands. This extends the connection between photocurrents …