Figure 1
Concept of the experiment.
(a) Schematic of the infrared photoluminescence measurement at a pulse excitation of 1.55 eV (800 nm). The momentum-spin locked currents along the surfaces are shown by red and blue arrows. (b) Schematic band structures of the bulk bands and surface state near 
and 
points for TlBiSe2, with optical pumping (red arrow) and infrared luminescence (orange arrow).
