Band Structure Dynamics in Indium Wires

Abstract

One-dimensional Indium wires grown on Si(111) substrates, which are metallic at high temperatures, become insulating below $\sim 100$ 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 $\sim 660$ 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.

arXiv comment14 pages, 7 figures

References in corpus (8)

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Cited by in corpus (7)

• Time- and Angle-Resolved Photoemission Studies of Quantum Materials
• Coherent control of a structural phase transition in a solid-state surface system
• The critical role of hot carrier cooling in optically excited structural transitions
• Excited state band mapping and momentum-resolved ultrafast population dynamics in In/Si(111) nanowires investigated with XUV based time- and angle-resolved photoemission spectroscopy
• Charge density wave melting in one-dimensional wires with femtosecond sub-gap excitation
• Origin of Immediate Damping of Coherent Oscillations in Photoinduced Charge Density Wave Transition
• Mode-selective ballistic pathway to a metastable electronic phase