Femtosecond laser excitation of the semiconductor-metal phase transition in VO2

Becker, Michael F.; Buckman, A. B.; Walser, R. M.; Lépine, Thierry; Georges, Patrick; Brun, Alain

doi:10.1063/1.112974

Cited by 243 publications

(125 citation statements)

References 6 publications

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“…The state of VO 2 immediately after photoexcitation is far from equilibrium, and the lattice potential is likely to continue to evolve to that of the R-phase during the thermalization process 30,31 . On these timescales, the evolution of the lattice and the electronic structure may not be concurrent, but may be accessible optically through the analysis of the broadband dielectric function 32,33 .…”

Section: Discussionmentioning

confidence: 99%

Ultrafast changes in lattice symmetry probed by coherent phonons

et al. 2012

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The electronic and structural properties of a material are strongly determined by its symmetry. Changing the symmetry via a photoinduced phase transition offers new ways to manipulate material properties on ultrafast timescales. However, to identify when and how fast these phase transitions occur, methods that can probe the symmetry change in the time domain are required. Here we show that a time-dependent change in the coherent phonon spectrum can probe a change in symmetry of the lattice potential, thus providing an all-optical probe of structural transitions. We examine the photoinduced structural phase transition in Vo 2 and show that, above the phase transition threshold, photoexcitation completely changes the lattice potential on an ultrafast timescale. The loss of the equilibrium-phase phonon modes occurs promptly, indicating a non-thermal pathway for the photoinduced phase transition, where a strong perturbation to the lattice potential changes its symmetry before ionic rearrangement has occurred.

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Section: Discussionmentioning

confidence: 99%

Ultrafast changes in lattice symmetry probed by coherent phonons

et al. 2012

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“…This latter has been investigated comprehensively by Verleur et al and Barker et al (44). One should mention that recent femtosecond laser investigations have been carried out to study the dynamic response of the VO 2 refractive index as well to measure the structural transition duration which was found to occur within Ϸ500 fs (45)(46). Such an ultrafast change in complex refractive index with temperature should enable ultra-fast optical switching devices based on VO 2 (47).…”

Section: Elocal Eincidentmentioning

confidence: 99%

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

Mâaza

Nemraoui²,

Sella

et al. 2005

Gold Bull

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A new type of photo-active nano-composite material appropriate for Ultra-fast Nonlinear Optical (3) ( ) applications has been synthesized and optically characterized. Compared to standard noble metal particles-oxide nano-composites exhibiting a superior effective (3) ( ) due to the enhancement of the local electric field, these Au-VO 2 nano-composites display an additional reversibly tunable surface plasmon frequency under external temperature stimuli. Such a smart plasmon tunability is correlated to the Mott's type semiconducting/metallic 1st order transition of the host VO 2 matrix. The nano-gold surface plasmon wavelength shifts reversibly from 645 nm to 598nm when the Au-VO 2 nano-composites temperature varies from 25°C to 120°C.

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“…[5][6][7][8] In addition, this material has attracted much attention for its potential applications in ultrafast optical and electrical switching. [9][10][11][12][13] Therefore, much effort has been made to modulate the MIT by various approaches such as strain engineering, 14,15 ionic liquid gating, [16][17][18] electric field-induced oxygen vacancy, 19 and chemical doping. [20][21][22][23][24][25] In terms of chemical doping, using metal elements such as tungsten during growth can dramatically change the transition properties 20,26 , but it is an irreversible process.…”

mentioning

confidence: 99%

Hydrogen Diffusion and Stabilization in Single-Crystal VO₂ Micro/Nanobeams by Direct Atomic Hydrogenation

Lin¹,

Ji²,

Swift³

et al. 2014

Nano Lett.

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We report measurements of the diffusion of atomic hydrogen in single crystalline VO 2 micro/nanobeams by direct exposure to atomic hydrogen, without catalyst. The atomic hydrogen is generated by a hot filament, and the doping process takes place at moderate temperature (373 K). Undoped VO 2 has a metal-to-insulator phase transition at ~340 K between a high -temperature, rutile, metallic phase and a low-temperature, monoclinic, insulating phase with a resistance exhibiting a semiconductor-like temperature dependence.Atomic hydrogenation results in stabilization of the metallic phase of VO 2 micro/nanobeam down to 2 K, the lowest point we could reach in our measurement setup. Optical characterization shows that hydrogen atoms prefer to diffuse along the c-axis of rutile (a-axis of monoclinic) VO 2 , along the oxygen "channels". Based on observing the movement of the hydrogen diffusion front in single crystalline VO 2 beams, we estimate the diffusion constant

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Femtosecond laser excitation of the semiconductor-metal phase transition in VO2

Cited by 243 publications

References 6 publications

Ultrafast changes in lattice symmetry probed by coherent phonons

Ultrafast changes in lattice symmetry probed by coherent phonons

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

Hydrogen Diffusion and Stabilization in Single-Crystal VO₂ Micro/Nanobeams by Direct Atomic Hydrogenation

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Femtosecond laser excitation of the semiconductor-metal phase transition in VO2

Cited by 243 publications

References 6 publications

Ultrafast changes in lattice symmetry probed by coherent phonons

Ultrafast changes in lattice symmetry probed by coherent phonons

Surface Plasmon Resonance Tunability in Au−VO2 Thermochromic Nano-composites

Hydrogen Diffusion and Stabilization in Single-Crystal VO2 Micro/Nanobeams by Direct Atomic Hydrogenation

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Product

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Hydrogen Diffusion and Stabilization in Single-Crystal VO₂ Micro/Nanobeams by Direct Atomic Hydrogenation