• Gierz, Isabella

Abstract

One-dimensional Indium wires grown on Si(111) substrates, which are metallic at high temperatures, become insulating belowK 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 withinfs 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.

Topics

• density
• impedance spectroscopy
• phase
• phase transition
• wire
• one-dimensional
• band structure
• Indium