Ultrafast photo-induced dynamics across the metal-insulator transition of VO2

Siming Wang, Juan Gabriel Ramirez, Jonathan Jeffet, Shimshon Bar-Ad, Dan Huppert, Ivan K. Schuller

Research output: Contribution to journalArticlepeer-review

Abstract

The transient reflectivity of VO2 films across the metal-insulator transition clearly shows that with low-fluence excitation, when insulating domains are dominant, energy transfer from the optically excited electrons to the lattice is not instantaneous, but precedes the superheating-driven expansion of the metallic domains. This implies that the phase transition in the coexistence regime is lattice-, not electronically-driven, at weak laser excitation. The superheated phonons provide the latent heat required for the propagation of the optically-induced phase transition. For VO2 this transition path is significantly different from what has been reported in the strong-excitation regime. We also observe a slow-down of the superheating-driven expansion of the metallic domains around the metal-insulator transition, which is possibly due to the competition among several co-existing phases, or an emergent critical-like behavior.

Original languageEnglish
Article number27005
JournalJournal de Physique (Paris), Lettres
Volume118
Issue number2
DOIs
StatePublished - Apr 2017

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

Fingerprint

Dive into the research topics of 'Ultrafast photo-induced dynamics across the metal-insulator transition of VO2'. Together they form a unique fingerprint.

Cite this