ultrafast luminescence from topological insulator

What is it about?

This paper reports optically detecting the edge-state of a three-dimensional topological insulator under ambient conditions by ultrafast infrared photoluminescence spectroscopy

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Why is it important?

In addition to insulator like luminescence from the bulk, metal like luminescence from the surface states of topological insulator TlBiSe2 is observed. It provides information about ultrafast dynamics of photoexcited carriers in topological insulator.