标题：Ultrafast evolution of bulk, surface and surface resonance states in photoexcited usepackage usepackage usepackage usepackage beginhbox _\hbox _end Bi 2 Te 3
摘要：We use circular dichroism (CD) in time- and angle-resolved photoemission spectroscopy (trARPES) to measure the femtosecond charge dynamics in the topological insulator (TI)
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