Extended Data Fig. 1: Time-resolved ARPES spectra over a wide energy range.
From: Spin-polarized spatially indirect excitons in a topological insulator
Non-equilibrium ARPES spectrum of energy versus momentum cuts along the \(\bar{\Gamma }-\bar{{\rm{M}}}\) direction, measured at 20 K before and 0, 0.2, 0.4, 0.6, 1, 3, and 5, 10 ps after pumping from left to right. At the earliest stage (0-0.2 ps), the upper surface resonance state (SR2) is observed. Photoexcited electrons in SR2 decay fast to populate the lower surface resonance state (SR1) and bulk conduction band (CB), consistent with previous study75.
