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One-dimensional Indium wires grown on Si(111) substrates, which are metallicat high temperatures, become insulating below $\sim100$ K due to the formationof a Charge Density Wave (CDW). The physics of this transition is notconventional and involves a multiband Peierls instability with strong interbandcoupling. This CDW ground state is readily destroyed with femtosecond laserpulses resulting in a light-induced insulator-to-metal phase transition. Thecurrent understanding of this transition remains incomplete, requiringmeasurements of the transient electronic structure to complement previousinvestigations of the lattice dynamics. Time- and angle-resolvedphoto\-emission spectroscopy with extreme ultra-violet radiation is applied tothis end. We find that the transition from the insulating to the metallic bandstructure occurs within $\sim660$ fs that is a fraction of the amplitude modeperiod. The long life time of the transient state ($>100$ ps) is attributed totrapping in a metastable state in accordance with previous work.

Band Structure Dynamics in Indium Wires