skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Ultrafast response of photoexcited carriers in VO 2 at high-pressure

Journal Article · · New Journal of Physics

We utilize near-infrared pump—mid-infrared probe spectroscopy to investigate the ultrafast electronic response of pressurized VO2. A clear anomaly in the linear mid-infrared response as well as in the fluence dependence of the pump–probe signal is observed around 8 GPa indicating a pressure-induced phase transition. Distinct pump–probe signals and a pumping threshold behavior typical for the insulating VO2 phase persist also in the high-pressure phase. Thus, in contrast to the temperature-induced rutile metallic state of VO2, the pressure-induced monoclinic phase preserves the energy gap. However, our results indicate the appearance and a gradual growth of additional intragap states upon increasing pressure above 8 GPa. Furthermore, these observations can be interpreted in terms of a bandwidth-controlled Mott–Hubbard transition.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1462574
Alternate ID(s):
OSTI ID: 1474707
Journal Information:
New Journal of Physics, Journal Name: New Journal of Physics Vol. 20 Journal Issue: 8; ISSN 1367-2630
Publisher:
IOP PublishingCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

References (48)

Pressure–Temperature Phase Diagram of Vanadium Dioxide journal March 2017
Control of the metal–insulator transition in vanadium dioxide by modifying orbital occupancy journal September 2013
Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging journal December 2007
Vanadium Dioxide: A Peierls-Mott Insulator Stable against Disorder journal June 2012
Probing the electronic and local structural changes across the pressure-induced insulator-to-metal transition in VO 2 journal October 2014
Calibration of the ruby pressure gauge to 800 kbar under quasi-hydrostatic conditions journal January 1986
Evidence for photo-induced monoclinic metallic VO 2 under high pressure journal January 2014
A photoinduced metal-like phase of monoclinic VO 2 revealed by ultrafast electron diffraction journal October 2014
Metallization of vanadium dioxide driven by large phonon entropy journal November 2014
Ultrafast changes in lattice symmetry probed by coherent phonons journal January 2012
Ultrafast Mid-Infrared Nanoscopy of Strained Vanadium Dioxide Nanobeams journal January 2016
Measurement of a solid-state triple point at the metal–insulator transition in VO2 journal August 2013
Non-congruence of thermally driven structural and electronic transitions in VO 2 journal November 2012
Inhomogeneity of the ultrafast insulator-to-metal transition dynamics of VO2 journal April 2015
The two components of the crystallographic transition in VO2 journal November 1971
Oxides Which Show a Metal-to-Insulator Transition at the Neel Temperature journal July 1959
Metal-insulator transitions journal October 1998
Electrodynamics of correlated electron materials journal June 2011
Dynamical Singlets and Correlation-Assisted Peierls Transition in V O 2 journal January 2005
Insulating phases of vanadium dioxide are Mott-Hubbard insulators journal February 2017
Resolving the VO 2 controversy: Mott mechanism dominates the insulator-to-metal transition journal January 2017
Transfer of Spectral Weight and Symmetry across the Metal-Insulator Transition in VO 2 journal September 2006
Monoclinic and Correlated Metal Phase in VO 2 as Evidence of the Mott Transition: Coherent Phonon Analysis journal December 2006
Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films journal March 2016
Structural Aspects of the Metal-Insulator Transitions in Cr-Doped V O 2 journal April 1972
Dimerization of a linear Heisenberg chain in the insulating phases of V 1 x Cr x O 2 journal September 1974
Femtosecond Structural Dynamics in VO 2 during an Ultrafast Solid-Solid Phase Transition journal November 2001
Evidence for a structurally-driven insulator-to-metal transition in VO 2 : A view from the ultrafast timescale journal October 2004
Band-Selective Measurements of Electron Dynamics in VO 2 Using Femtosecond Near-Edge X-Ray Absorption journal August 2005
Enhanced Photosusceptibility near T c for the Light-Induced Insulator-to-Metal Phase Transition in Vanadium Dioxide journal November 2007
Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition in VO 2 journal September 2007
Ultrafast insulator-metal phase transition in VO 2 studied by multiterahertz spectroscopy journal May 2011
Phase diagram of the ultrafast photoinduced insulator-metal transition in vanadium dioxide journal April 2012
Instantaneous Band Gap Collapse in Photoexcited Monoclinic VO 2 due to Photocarrier Doping journal November 2014
Evidence of a Pressure-Induced Metallization Process in Monoclinic VO 2 journal May 2007
Anisotropic compression in the high-pressure regime of pure and chromium-doped vanadium dioxide journal May 2012
Pair distribution function analysis: The role of structural degrees of freedom in the high-pressure insulator to metal transition of VO 2 journal June 2016
Pressure-induced phase transitions and metallization in VO 2 journal March 2015
Multiple crossovers and coherent states in a Mott-Peierls insulator journal January 2018
Raman scattering in VO2 journal May 2002
Possible pressure-induced insulator-to-metal transition in low-dimensional TiOCl journal November 2006
Pressure-Dependent Relaxation in the Photoexcited Mott Insulator ET F 2 TCNQ : Influence of Hopping and Correlations on Quasiparticle Recombination Rates journal March 2014
Photoinduced phase transitions in narrow-gap Mott insulators: The case of VO 2 journal March 2016
Femtosecond electronic heat-transport dynamics in thin gold films journal October 1987
Optical Conductivity in Mott-Hubbard Systems journal July 1995
Anomalous semiconducting behavior on VO 2 under high pressure journal January 2015
Mott transition in the d =∞ Hubbard model at zero temperature journal March 1993
Metal-Insulator Transition in VO 2 : A DFT + DMFT Perspective journal July 2016

Cited By (1)

Ultrafast Insulator-Metal Transition in VO 2 Nanostructures Assisted by Picosecond Strain Pulses journal January 2019