Universal phase dynamics in VO 2 switches revealed by ultrafast operando diffraction
Abstract
Vanadium dioxide is known to have a coupled structural and electronic transition that can be accessed through light, thermal, or electrical excitation. Ultrafast optical studies of this insulator-to-metal transition indicate that it is mediated by the formation of a transient metallic phase that retains the structure of the original insulating phase. Sood et al. show that a similar sequence occurs when the material is electrically excited with a series of voltage pulses. Using ultrafast electron diffraction, the researchers monitored the structure of a vanadium dioxide sample after excitation and found evidence of a metastable metallic phase that appears during the transition.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 16, 2021
- Source ID
- 10.1126/science.abc0652
Entities
People
- Aaron M Lindenberg
- Aditya Sood
- Long-Qing Chen
- Marc Zajac
- Shriram Ramanathan
- Suhas Kumar
- Suji Park
- William Chueh
- Xiaozhe Shen
- Xijie Wang
- Yi-Fei Sun
- Yin Shi
Organizations
- Air Force Office of Scientific Research
- Hewlett Packard Labs
- National Science Foundation
- Pennsylvania State University
- Purdue University
- SLAC National Accelerator Laboratory
- Stanford University
- United States Department of Energy