Emergence of Three-fold Symmetric Helical Photocurrents in Epitaxial Low Twinned Bi${}_2$Se${}_3$

Blair C. Connelly, Patrick J. Taylor, George J. de Coster

We observe enhanced three-fold symmetric helicity-dependent topological photocurrents using time-domain THz spectroscopy in epitaxially-grown Bi2Se3 with reduced crystallographic t…