In order to study the spin-texture of topological surface states usually a number of experiments are needed. Using FeSuMa, one can record the circular dichroism within a minute ! This example is recorded by using the right- and lefthand circularly polarized laser light. The maps are the raw datasets, i.e. are still in angular scale with non-zero tilt angle, and therefore appear distorted. When transformed to the k-scale, they look as symmetric as the one in the middle of the slide.
To see the dataset, please, follow this link: