One-dimensional Indium wires grown on Si(111) substrates, which are metallic at high temperatures, become insulating below ∼100 K due to the formation of a Charge Density Wave (CDW). The physics of this transition is not conventional and involves a multiband Peierls instability with strong interband coupling. This CDW ground state is readily destroyed with femtosecond laser pulses resulting in a light-induced insulator-to-metal phase transition. The current understanding of this transition remains incomplete, requiring measurements of the transient electronic structure to complement previous investigations of the lattice dynamics. Time- and angle-resolved photo\-emission spectroscopy with extreme ultra-violet radiation is applied to this end. We find that the transition from the insulating to the metallic band structure occurs within ∼660 fs that is a fraction of the amplitude mode period. The long life time of the transient state (>100 ps) is attributed to trapping in a metastable state in accordance with previous work.
@article{arxiv.1803.05189,
title = {Band Structure Dynamics in Indium Wires},
author = {M. Chávez-Cervantes and R. Krause and S. Aeschlimann and I. Gierz},
journal= {arXiv preprint arXiv:1803.05189},
year = {2018}
}