Figure 2
From: Electronic structure and relaxation dynamics in a superconducting topological material
Observation of 2D states in Sr0.06Bi2Se3.
(a) Dispersion map of Sr0.06Bi2Se3 along the 
high-symmetry direction recorded by using incident photon energy of 22 eV and 24 eV at a temperature of 17 K. This dataset was obtained with normal ARPES setup. (b) Dispersion maps measured in TRARPES setup with 6 eV laser source. Left panel shows the ARPES band dispersion of Sr0.06Bi2Se3 at a negative time delay along the 
high-symmetry direction. Right panel shows the dispersion maps for positive time delay. At both experimental setup, the 2D quantum well states are observed.
