Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy

Jager, Marieke F.; Ott, Christian; Kraus, Peter M.; Kaplan, Christopher J.; Pouse, Winston; Marvel, Robert E.; Haglund, Richard F.; Neumark, Daniel M.; Leone, Stephen R.

doi:10.1073/pnas.1707602114

Title: Tracking the insulator-to-metal phase transition in VO₂ with few-femtosecond extreme UV transient absorption spectroscopy

Abstract

We present coulomb correlations can manifest in exotic properties in solids, but how these properties can be accessed and ultimately manipulated in real time is not well understood. The insulator-to-metal phase transition in vanadium dioxide (VO₂) is a canonical example of such correlations. Here, few-femtosecond extreme UV transient absorption spectroscopy (FXTAS) at the vanadium M_2,3 edge is used to track the insulator-to-metal phase transition in VO₂ . This technique allows observation of the bulk material in real time, follows the photoexcitation process in both the insulating and metallic phases, probes the subsequent relaxation in the metallic phase, and measures the phase-transition dynamics in the insulating phase. An understanding of the VO₂ absorption spectrum in the extreme UV is developed using atomic cluster model calculations, revealing V³⁺/d² character of the vanadium center. We find that the insulator-to-metal phase transition occurs on a timescale of 26 ± 6 fs and leaves the system in a long-lived excited state of the metallic phase, driven by a change in orbital occupation. Potential interpretations based on electronic screening effects and lattice dynamics are discussed. A Mott–Hubbard-type mechanism is favored, as the observed timescales and d² nature of the vanadium metal centers are inconsistent with amore »« less

Authors:

Jager, Marieke F. ^[1]; Ott, Christian ^[2]; Kraus, Peter M. ^[1]; Kaplan, Christopher J. ^[1]; Pouse, Winston ^[2]; Marvel, Robert E. ^[3]; Haglund, Richard F. ^[4]; Neumark, Daniel M. ^[5]; Leone, Stephen R. ^[6]

Univ. of California, Berkeley, CA (United States). Department of Chemistry
Univ. of California, Berkeley, CA (United States). Department of Chemistry and Department of Physics
Vanderbilt Univ., Nashville, TN (United States). Interdisciplinary Materials Science Program
Vanderbilt Univ., Nashville, TN (United States). Interdisciplinary Materials Science Program and Department of Physics and Astronomy
Univ. of California, Berkeley, CA (United States). Department of Chemistry; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division
Univ. of California, Berkeley, CA (United States). Department of Chemistry and Department of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Chemical Sciences Division

Publication Date:: Mon Aug 21 00:00:00 EDT 2017

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1426733

Grant/Contract Number:: AC02-05CH11231; AC03-76SF00098

Resource Type:: Accepted Manuscript

Journal Name:: Proceedings of the National Academy of Sciences of the United States of America

Additional Journal Information:: Journal Volume: 114; Journal Issue: 36; Journal ID: ISSN 0027-8424

Publisher:: National Academy of Sciences, Washington, DC (United States)

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ultrafast dynamics; vanadium dioxide; insulator-to-metal transition; extreme UV

Citation Formats


                    Jager, Marieke F., Ott, Christian, Kraus, Peter M., Kaplan, Christopher J., Pouse, Winston, Marvel, Robert E., Haglund, Richard F., Neumark, Daniel M., and Leone, Stephen R. Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy.  United States: N. p., 2017. 
Web.  doi:10.1073/pnas.1707602114.

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                    Jager, Marieke F., Ott, Christian, Kraus, Peter M., Kaplan, Christopher J., Pouse, Winston, Marvel, Robert E., Haglund, Richard F., Neumark, Daniel M., & Leone, Stephen R. Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy.  United States.  https://doi.org/10.1073/pnas.1707602114

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                    Jager, Marieke F., Ott, Christian, Kraus, Peter M., Kaplan, Christopher J., Pouse, Winston, Marvel, Robert E., Haglund, Richard F., Neumark, Daniel M., and Leone, Stephen R. Mon .  
"Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy".  United States.  https://doi.org/10.1073/pnas.1707602114.  https://www.osti.gov/servlets/purl/1426733.

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@article{osti_1426733,

  title        = {Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy},

  author       = {Jager, Marieke F. and Ott, Christian and Kraus, Peter M. and Kaplan, Christopher J. and Pouse, Winston and Marvel, Robert E. and Haglund, Richard F. and Neumark, Daniel M. and Leone, Stephen R.},

  abstractNote = {We present coulomb correlations can manifest in exotic properties in solids, but how these properties can be accessed and ultimately manipulated in real time is not well understood. The insulator-to-metal phase transition in vanadium dioxide (VO2) is a canonical example of such correlations. Here, few-femtosecond extreme UV transient absorption spectroscopy (FXTAS) at the vanadium M2,3 edge is used to track the insulator-to-metal phase transition in VO2 . This technique allows observation of the bulk material in real time, follows the photoexcitation process in both the insulating and metallic phases, probes the subsequent relaxation in the metallic phase, and measures the phase-transition dynamics in the insulating phase. An understanding of the VO2 absorption spectrum in the extreme UV is developed using atomic cluster model calculations, revealing V3+/d2 character of the vanadium center. We find that the insulator-to-metal phase transition occurs on a timescale of 26 ± 6 fs and leaves the system in a long-lived excited state of the metallic phase, driven by a change in orbital occupation. Potential interpretations based on electronic screening effects and lattice dynamics are discussed. A Mott–Hubbard-type mechanism is favored, as the observed timescales and d2 nature of the vanadium metal centers are inconsistent with a Peierls driving force. In conclusion, the findings provide a combined experimental and theoretical roadmap for using time-resolved extreme UV spectroscopy to investigate nonequilibrium dynamics in strongly correlated materials.},

  doi          = {10.1073/pnas.1707602114},

  journal      = {Proceedings of the National Academy of Sciences of the United States of America},

  number       = 36,

  volume       = 114,

  place        = {United States},

  year         = {Mon Aug 21 00:00:00 EDT 2017},

  month        = {Mon Aug 21 00:00:00 EDT 2017}

}

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Journal Article Singh, V. R. ; Jovic, V. ; Valmianski, I. ; ... - Applied Physics Letters

In this study, we show the ability of soft x-ray irradiation to induce room temperature metal-insulator transitions (MITs) in VO₂ thin films grown on R-plane sapphire. The ability of soft x-rays to induce MIT in VO₂ thin films is confirmed by photoemission spectroscopy and soft x-ray spectroscopy measurements. When irradiation was discontinued, the systems do not return to the insulating phase. Analysis of valence band photoemission spectra revealed that the density of states (DOSs) of the V 3d band increased with irradiation time, while the DOS of the O 2p band decreased. We use these results to propose a modelmore »« less
Cited by 3
https://doi.org/10.1063/1.5012940

Full Text Available
Large epitaxial bi-axial strain induces a Mott-like phase transition in VO{sub 2}

Journal Article Kittiwatanakul, Salinporn ; Wolf, Stuart A. ; Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904 ; ... - Applied Physics Letters

The metal insulator transition (MIT) in vanadium dioxide (VO{sub 2}) has been an important topic for recent years. It has been generally agreed upon that the mechanism of the MIT in bulk VO{sub 2} is considered to be a collaborative Mott-Peierls transition, however, the effect of strain on the phase transition is much more complicated. In this study, the effect of the large strain on the properties of VO{sub 2} films was investigated. One remarkable result is that highly strained epitaxial VO{sub 2} thin films were rutile in the insulating state as well as in the metallic state. These highlymore »« less
https://doi.org/10.1063/1.4893326
Decoupling the metal insulator transition and crystal field effects of VO₂

Journal Article Hwang, In-Hui ; Park, Chang-In ; Yeo, Sunmog ; ... - Scientific Reports

VO₂ is a highly correlated electron system which has a metal-to-insulator transition (MIT) with a dramatic change of conductivity accompanied by a first-order structural phase transition (SPT) near room temperature. The origin of the MIT is still controversial and there is ongoing debate over whether an SPT induces the MIT and whether the T_c can be engineered using artificial parameters. We examined the electrical and local structural properties of Cr- and Co-ion implanted VO₂ (Cr-VO₂ and Co-VO₂) films using temperature-dependent resistance and X-ray absorption fine structure (XAFS) measurements at the V K edge. The temperature-dependent electrical resistance measurements of bothmore »« less
https://doi.org/10.1038/s41598-021-82588-4

Full Text Available
Redox Dynamics of Active VO _x Sites Promoted by TiO _x during Oxidative Dehydrogenation of Ethanol Detected by Operando Quick XAS

Journal Article Zabilska, Anna ; Clark, Adam H. ; Moskowitz, Benjamin M. ; ... - JACS Au

Titania-supported vanadia (VO_x/TiO₂) catalysts exhibit outstanding catalytic in a number of selective oxidation and reduction processes. In spite of numerous investigations, the nature of redox transformations of vanadium and titanium involved in various catalytic processes remains difficult to detect and correlate to the rate of products formation. In this work, we studied the redox dynamics of active sites in a bilayered 5% V₂O₅/15% TiO₂/SiO2 catalyst (consisting of submonolayer VO_x species anchored onto a TiO_x monolayer, which in turn is supported on SiO₂) during the oxidative dehydrogenation of ethanol. The VO_x species in 5% V₂O₅/15% TiO₂/SiO₂ show high selectivity to acetaldehydemore »« less
https://doi.org/10.1021/jacsau.2c00027
Magnetic and electrical properties of Eu{sub 2}VO{sub 4}

Journal Article Ramanujachary, K V ; Sunstrom, IV, J E ; Fawcett, I ; ... - Materials Research Bulletin

Eu{sub 2}VO{sub 4} with the K{sub 2}NiF{sub 4}-type structure was prepared by heating Eu{sub 2}O{sub 3}, V{sub 2}O{sub 5}, and V metal at 1473 K in an evacuated silica ampoule. Rietveld refinement of the powder X-ray diffraction (XRD) data confirmed the presence of layers of corner-shared VO{sub 6} octahedra with V-O bond distances of 1.928(1) {angstrom} ({times} 4) and 2.04 ({times} 2) perpendicular to the tetragonal c axis. X-ray absorption near-edge spectroscopy (XANES) indicated that the Eu is mixed-valent [Eu(II)/Eu(III)], while vanadium exists exclusively in the trivalent state. These valence assignments were supported by the results of temperature-dependent magnetic susceptibilitymore »« less
https://doi.org/10.1016/S0025-5408(99)00063-X

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Title: Tracking the insulator-to-metal phase transition in VO2 with few-femtosecond extreme UV transient absorption spectroscopy

Abstract

Citation Formats

VO2 films with strong semiconductor to metal phase transition prepared by the precursor oxidation process journal, August 2007

Characterization of broadband few-cycle laser pulses with the d-scan technique journal, January 2012

Multiplet effects in X-ray spectroscopy journal, January 2005

High-resolution experimental and theoretical study of singly and doubly excited resonances in ground-state photoionization of neon journal, October 1996

Attosecond metrology: from electron capture to future signal processing journal, February 2014

Band-Selective Measurements of Electron Dynamics in VO 2 Using Femtosecond Near-Edge X-Ray Absorption journal, August 2005

Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids journal, June 2016

M 2 , 3 spectrum of atomic Mn journal, June 1978

Theory for displacive excitation of coherent phonons journal, January 1992

Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films journal, August 2005

Autoionization in bulk, multilayer, and monolayer Cr journal, March 1986

Petahertz optical drive with wide-bandgap semiconductor journal, April 2016

Synthesis of vanadium dioxide thin films and nanoparticles journal, June 2008

Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond journal, August 2016

VO 2 : Peierls or Mott-Hubbard? A view from band theory journal, May 1994

Bound states and critical behavior of the Yukawa potential journal, January 2006

Electronic Properties of V O 2 near the Semiconductor-Metal Transition journal, September 1969

Raman scattering in VO2 journal, May 2002

Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films journal, March 2016

THz Transmittance and Electrical Properties Tuning across IMT in Vanadium Dioxide Films by Al Doping journal, April 2016

Picosecond soft x-ray absorption measurement of the photoinduced insulator-to-metal transition in VO 2 journal, April 2004

Dynamical Singlets and Correlation-Assisted Peierls Transition in V O 2 journal, January 2005

Orbital-Assisted Metal-Insulator Transition in VO 2 journal, November 2005

Insulating phases of vanadium dioxide are Mott-Hubbard insulators journal, February 2017

Control of the metal–insulator transition in vanadium dioxide by modifying orbital occupancy journal, September 2013

Vacuum-ultraviolet reflectance and photoemission study of the metal-insulator phase transitions in VO 2 , V 6 O 13 , and V 2 O 3 journal, March 1990

Oxide Electronics Utilizing Ultrafast Metal-Insulator Transitions journal, August 2011

∼8 keV photoemission of the metal–insulator transition system VO 2 journal, October 2009

On the Transition to Metallic Conduction in Semiconductors journal, December 1956

Influence of infrared optical properties by transformation of the crystal structure in Al-doped vanadium dioxide films journal, January 2016

Semiconductor to metal phase transition in the nucleation and growth of VO2 nanoparticles and thin films journal, July 2004

Theory of X-Ray Photoemission and X-Ray Emission Spectra in Mn Compounds journal, January 1997

Instantaneous Band Gap Collapse in Photoexcited Monoclinic VO 2 due to Photocarrier Doping journal, November 2014

Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott–Hubbard material journal, January 2017

Femtosecond Structural Dynamics in VO 2 during an Ultrafast Solid-Solid Phase Transition journal, November 2001

Femtosecond laser excitation of the semiconductor‐metal phase transition in VO 2 journal, September 1994

Linking high harmonics from gases and solids journal, June 2015

Controlling dielectrics with the electric field of light journal, December 2012

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

Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition in VO 2 journal, September 2007

Interaction of many discrete states with many continua journal, March 1977

4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction journal, November 2007

In situ characterization of few-cycle laser pulses in transient absorption spectroscopy journal, January 2015

Metal-insulator transitions journal, October 1998

Ultrafast Nanoimaging of the Photoinduced Phase Transition Dynamics in VO 2 journal, April 2016

X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92 journal, July 1993

Slowdown of the Electronic Relaxation Close to the Mott Transition journal, August 2016

The 2016 oxide electronic materials and oxide interfaces roadmap journal, October 2016

The CTM4XAS program for EELS and XAS spectral shape analysis of transition metal L edges journal, October 2010

Real-Time Probing of Electron Dynamics Using Attosecond Time-Resolved Spectroscopy journal, May 2016

Role of Defects in the Phase Transition of VO 2 Nanoparticles Probed by Plasmon Resonance Spectroscopy journal, January 2012

Attosecond spectroscopy in condensed matter journal, October 2007

Inhomogeneity of the ultrafast insulator-to-metal transition dynamics of VO2 journal, April 2015

Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control journal, May 2013

Tracking the evolution of electronic and structural properties of VO 2 during the ultrafast photoinduced insulator-metal transition journal, March 2013

Ultrafast dynamics during the photoinduced phase transition in VO2 journal, December 2015

Vanadium Dioxide: A Peierls-Mott Insulator Stable against Disorder journal, June 2012

Evidence for a structurally-driven insulator-to-metal transition in VO 2 : A view from the ultrafast timescale journal, October 2004

Attosecond band-gap dynamics in silicon journal, December 2014

Strong hybridization in vanadium oxides: evidence from photoemission and absorption spectroscopy journal, June 1998

Electronic structure of 3d-transition-metal oxides: on-site Coulomb repulsion versus covalency journal, January 1999

Experimental study of resonant photoemission in the metals V, Cr, Mn and Co journal, August 1997

M 2,3 absorption spectroscopy of 3d transition-metal compounds journal, September 1991

Vanadium Dioxide: The Multistimuli Responsive Material and Its Applications journal, August 2018

Roadmap of ultrafast x-ray atomic and molecular physics journal, January 2018

Transient absorption spectroscopy using high harmonic generation: a review of ultrafast X-ray dynamics in molecules and solids journal, April 2019

Recent Progress in Active Optical Metasurfaces journal, April 2019

Extreme Ultraviolet Time- and Angle-Resolved Photoemission Spectroscopy with 21.5 meV Resolution using High-Order Harmonic Generation from a Turn-Key Yb:KGW Amplifier text, January 2019

Attosecond transient absorption instrumentation for thin film materials: Phase transitions, heat dissipation, signal stabilization, timing correction, and rapid sample rotation journal, January 2018

Multiscale time-dependent density functional theory for a unified description of ultrafast dynamics: Pulsed light, electron, and lattice motions in crystalline solids journal, June 2019

How optical excitation controls the structure and properties of vanadium dioxide text, January 2018

Spatially Resolved Dynamically Reconfigurable Multilevel Control of Thermal Emission journal, December 2019

Roadmap of ultrafast x-ray atomic and molecular physics text, January 2019

Attosecond screening dynamics mediated by electron localization in transition metals journal, August 2019

The ultrafast X-ray spectroscopic revolution in chemical dynamics journal, May 2018

Title: Tracking the insulator-to-metal phase transition in VO₂ with few-femtosecond extreme UV transient absorption spectroscopy

VO2 films with strong semiconductor to metal phase transition prepared by the precursor oxidation process
journal, August 2007

Characterization of broadband few-cycle laser pulses with the d-scan technique
journal, January 2012

Multiplet effects in X-ray spectroscopy
journal, January 2005

High-resolution experimental and theoretical study of singly and doubly excited resonances in ground-state photoionization of neon
journal, October 1996

Attosecond metrology: from electron capture to future signal processing
journal, February 2014

Band-Selective Measurements of Electron Dynamics in ${VO}_{2}$ Using Femtosecond Near-Edge X-Ray Absorption
journal, August 2005

Direct time-domain observation of attosecond final-state lifetimes in photoemission from solids
journal, June 2016

$M_{2, 3}$ spectrum of atomic Mn
journal, June 1978

Theory for displacive excitation of coherent phonons
journal, January 1992

Grain size effect on the semiconductor-metal phase transition characteristics of magnetron-sputtered VO2 thin films
journal, August 2005

Autoionization in bulk, multilayer, and monolayer Cr
journal, March 1986

Petahertz optical drive with wide-bandgap semiconductor
journal, April 2016

Synthesis of vanadium dioxide thin films and nanoparticles
journal, June 2008

Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond
journal, August 2016

${VO}_{2}$ : Peierls or Mott-Hubbard? A view from band theory
journal, May 1994

Bound states and critical behavior of the Yukawa potential
journal, January 2006

Electronic Properties of V $O_{2}$ near the Semiconductor-Metal Transition
journal, September 1969

Raman scattering in VO2
journal, May 2002

Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films
journal, March 2016

THz Transmittance and Electrical Properties Tuning across IMT in Vanadium Dioxide Films by Al Doping
journal, April 2016

Picosecond soft x-ray absorption measurement of the photoinduced insulator-to-metal transition in ${VO}_{2}$
journal, April 2004

Dynamical Singlets and Correlation-Assisted Peierls Transition in ${V O}_{2}$
journal, January 2005

Orbital-Assisted Metal-Insulator Transition in ${VO}_{2}$
journal, November 2005

Insulating phases of vanadium dioxide are Mott-Hubbard insulators
journal, February 2017

Control of the metal–insulator transition in vanadium dioxide by modifying orbital occupancy
journal, September 2013

Vacuum-ultraviolet reflectance and photoemission study of the metal-insulator phase transitions in ${VO}_{2}$ , $V_{6}$ $O_{13}$ , and $V_{2}$ $O_{3}$
journal, March 1990

Oxide Electronics Utilizing Ultrafast Metal-Insulator Transitions
journal, August 2011

∼8 keV photoemission of the metal–insulator transition system VO ₂
journal, October 2009

On the Transition to Metallic Conduction in Semiconductors
journal, December 1956

Influence of infrared optical properties by transformation of the crystal structure in Al-doped vanadium dioxide films
journal, January 2016

Semiconductor to metal phase transition in the nucleation and growth of VO2 nanoparticles and thin films
journal, July 2004

Theory of X-Ray Photoemission and X-Ray Emission Spectra in Mn Compounds
journal, January 1997

Instantaneous Band Gap Collapse in Photoexcited Monoclinic ${VO}_{2}$ due to Photocarrier Doping
journal, November 2014

Ultrafast evolution and transient phases of a prototype out-of-equilibrium Mott–Hubbard material
journal, January 2017

Femtosecond Structural Dynamics in ${VO}_{2}$ during an Ultrafast Solid-Solid Phase Transition
journal, November 2001

Femtosecond laser excitation of the semiconductor‐metal phase transition in VO ₂
journal, September 1994

Linking high harmonics from gases and solids
journal, June 2015

Controlling dielectrics with the electric field of light
journal, December 2012

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

Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition in ${VO}_{2}$
journal, September 2007

Interaction of many discrete states with many continua
journal, March 1977

4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction
journal, November 2007

In situ characterization of few-cycle laser pulses in transient absorption spectroscopy
journal, January 2015

Metal-insulator transitions
journal, October 1998

Ultrafast Nanoimaging of the Photoinduced Phase Transition Dynamics in VO ₂
journal, April 2016

X-Ray Interactions: Photoabsorption, Scattering, Transmission, and Reflection at E = 50-30,000 eV, Z = 1-92
journal, July 1993

Slowdown of the Electronic Relaxation Close to the Mott Transition
journal, August 2016

The 2016 oxide electronic materials and oxide interfaces roadmap
journal, October 2016

The CTM4XAS program for EELS and XAS spectral shape analysis of transition metal L edges
journal, October 2010

Real-Time Probing of Electron Dynamics Using Attosecond Time-Resolved Spectroscopy
journal, May 2016

Role of Defects in the Phase Transition of VO ₂ Nanoparticles Probed by Plasmon Resonance Spectroscopy
journal, January 2012

Attosecond spectroscopy in condensed matter
journal, October 2007

Inhomogeneity of the ultrafast insulator-to-metal transition dynamics of VO2
journal, April 2015

Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control
journal, May 2013

Tracking the evolution of electronic and structural properties of VO $_{2}$ during the ultrafast photoinduced insulator-metal transition
journal, March 2013

Ultrafast dynamics during the photoinduced phase transition in VO2
journal, December 2015

Vanadium Dioxide: A Peierls-Mott Insulator Stable against Disorder
journal, June 2012

Evidence for a structurally-driven insulator-to-metal transition in ${VO}_{2}$ : A view from the ultrafast timescale
journal, October 2004

Attosecond band-gap dynamics in silicon
journal, December 2014

Strong hybridization in vanadium oxides: evidence from photoemission and absorption spectroscopy
journal, June 1998

Electronic structure of 3d-transition-metal oxides: on-site Coulomb repulsion versus covalency
journal, January 1999

Experimental study of resonant photoemission in the metals V, Cr, Mn and Co
journal, August 1997

M _2,3 absorption spectroscopy of 3d transition-metal compounds
journal, September 1991

Vanadium Dioxide: The Multistimuli Responsive Material and Its Applications
journal, August 2018

Roadmap of ultrafast x-ray atomic and molecular physics
journal, January 2018

Transient absorption spectroscopy using high harmonic generation: a review of ultrafast X-ray dynamics in molecules and solids
journal, April 2019

Recent Progress in Active Optical Metasurfaces
journal, April 2019

Extreme Ultraviolet Time- and Angle-Resolved Photoemission Spectroscopy with 21.5 meV Resolution using High-Order Harmonic Generation from a Turn-Key Yb:KGW Amplifier
text, January 2019

Attosecond transient absorption instrumentation for thin film materials: Phase transitions, heat dissipation, signal stabilization, timing correction, and rapid sample rotation
journal, January 2018

Multiscale time-dependent density functional theory for a unified description of ultrafast dynamics: Pulsed light, electron, and lattice motions in crystalline solids
journal, June 2019

How optical excitation controls the structure and properties of vanadium dioxide
text, January 2018

Spatially Resolved Dynamically Reconfigurable Multilevel Control of Thermal Emission
journal, December 2019

Roadmap of ultrafast x-ray atomic and molecular physics
text, January 2019

Attosecond screening dynamics mediated by electron localization in transition metals
journal, August 2019

The ultrafast X-ray spectroscopic revolution in chemical dynamics
journal, May 2018

Magnetic phase and magneto-resistive effects in vanadium oxide epitaxial nanoclusters
journal, January 2020

Roadmap of ultrafast x-ray atomic and molecular physics
text, January 2018