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A photoinduced metal-like phase of monoclinic VO₂ revealed by ultrafast electron diffraction
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A photoinduced metal-like phase of monoclinic VO₂ revealed by ultrafast electron diffraction
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Journal Article
A photoinduced metal-like phase of monoclinic VO₂ revealed by ultrafast electron diffraction
2014
Overview
The complex interplay among several active degrees of freedom (charge, lattice, orbital, and spin) is thought to determine the electronic properties of many oxides. We report on combined ultrafast electron diffraction and infrared transmissivity experiments in which we directly monitored and separated the lattice and charge density reorganizations that are associated with the optically induced semiconductor-metal transition in vanadium dioxide (VO₂). By photoexciting the monoclinic semiconducting phase, we were able to induce a transition to a metastable state that retained the periodic lattice distortion characteristic of the semiconductor but also acquired metal-like mid-infrared optical properties. Our results demonstrate that ultrafast electron diffraction is capable of following details of both lattice and electronic structural dynamics on the ultrafast time scale.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
