Search results for " charge density wave"

showing 2 items of 2 documents

Optical control of vibrational coherence triggered by an ultrafast phase transition

2019

Femtosecond time-resolved x-ray diffraction is employed to study the dynamics of the periodic lattice distortion (PLD) associated with the charge-density-wave (CDW) in K0.3MoO3. Using a multi-pulse scheme we show the ability to extend the lifetime of coherent oscillations of the PLD about the undistorted structure through re-excitation of the electronic states. This suggests that it is possible to enter a regime where the symmetry of the potential energy landscape corresponds to the high symmetry phase but the scattering pathways that lead to the damping of coherent dynamics are still controllable by altering the electronic state population. The demonstrated control over the coherence time …

DiffractionPhysicsPhase transitionCoherence timeeducation.field_of_studyStrongly Correlated Electrons (cond-mat.str-el)ScatteringPopulationFOS: Physical sciences02 engineering and technology021001 nanoscience & nanotechnology01 natural sciences3. Good healthCondensed Matter - Strongly Correlated ElectronsLattice (order)0103 physical sciencesFemtosecondAtomic physics010306 general physics0210 nano-technologyeducationultrafast phase transition charge density wave optical controlCoherence (physics)
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Single crystal-like thin films of blue bronze

2021

Abstract Pulsed laser deposition technique was employed to grow thin films of K 0.3 M o O 3 on A l 2 O 3 (1-102) and S r T i O 3 (510) substrates. Structural and imaging characterization revealed good quality films with well oriented grains of few microns in length. Both non-selective (transport) and order-selective (femtosecond pump-probe spectroscopy) probes revealed charge density wave properties that are very close to those of the single crystals. The films exhibit metal-semiconductor phase transition in resistivity, pump-probe data show phase transition at the same temperature as the single crystal and the threshold for the photo-induced phase transition is approximately the same as in…

010302 applied physicsPhase transitionMaterials scienceMetals and AlloysAnalytical chemistry02 engineering and technologySurfaces and Interfaces021001 nanoscience & nanotechnology01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsPulsed laser depositionBlue bronze (BB) ; Charge density waves (CDW) ; Thin films ; Single crystal-like ; Ultrafast pump-probe spectroscopyElectrical resistivity and conductivity0103 physical sciencesFemtosecondMaterials ChemistryThin film0210 nano-technologySpectroscopySingle crystalCharge density waveThin Solid Films
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