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Ultrafast THz Field Control of Electronic and Structural Interactions in Vanadium Dioxide
- Source :
- Phys. Rev. B 98, 045104 (2018)
- Publication Year :
- 2016
-
Abstract
- Vanadium dioxide, an archetypal correlated-electron material, undergoes an insulator-metal transition near room temperature that exhibits electron-correlation-driven and structurally-driven physics. Using ultrafast optical spectroscopy and x-ray scattering we show that these processes can be disentangled in the time domain. Specifically, following intense sub-picosecond electric-field excitation, a partial collapse of the insulating gap occurs within the first ps. Subsequently, this electronic reconfiguration initiates a change in lattice symmetry taking place on a slower timescale. We identify the kinetic energy increase of electrons tunneling in the strong electric field as the driving force, illustrating a novel method to control electronic interactions in correlated materials on an ultrafast timescale.
- Subjects :
- Condensed Matter - Strongly Correlated Electrons
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 98, 045104 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1601.07490
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.98.045104