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Ing. Jan Hýbl: Výroba monokrystalického křemíku
Begin: 19.05.2021, 08:00
Location: ZOOM Meeting ID: 4613653704

Shin-ichi Fujimori: Electronic structures of uranium compounds studied by photoelectron spectroscopy
Begin: 19.05.2021, 10:10
Location: ZOOM Meeting ID: 958 0426 7376

Dariusz Kaczorowski: Dirac states in Pd-Bi superconductors: on the hunt for Majorana modes
Begin: 26.05.2021, 14:10
Location: ZOOM Meeting ID: 958 0426 7376

Laura Teresa Corredor Bohórquez: The (Bi2Te3)n(MnBi2Te4) family: van-der-Waals materials from topology to magnetism
Begin: 02.06.2021, 14:10
Location: ZOOM Meeting ID: 958 0426 7376

 
Title: Adam Dubroka: Study of photo-induced insulator-to-metal transition and excited states in LaCoO3 using femtosecond pump-probe ellipsometry
Number: 26/21
Status: Closing date exceeded
Begin: Thursday, 22.04. 2021, 14:00
Tutor: Václav Holý, Milan Dopita
Location: Zoom Meeting ID: 967 5516 9898

nanocent


Nano Seminar

 

Thursday, 22. 4. 2021, 14.00,

Join Zoom Meeting
https://cesnet.zoom.us/j/96755169898

Meeting ID: 967 5516 9898

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Adam Dubroka

Department of Condensed Matter Physics, Masaryk University, Kotlářská 2, Brno, Czech Republic

Study of photo-induced insulator-to-metal transition and excited states in LaCoO3 using femtosecond pump-probe ellipsometry

We have studied ultra-fast light excited states in thin films of LaCoO3 and La0.5Sr0.5CoO3 with femtosecond pump-probe ellispometry. We have observed rather large pump-induced changes in LaCoO3 response that correspond to a transition of spectral weight from high energies above 1.9~eV to lower energy and are indicative of a pump-induced insulator-to-metal transition. The excited state decays initially via a fast process on characteristic timescale of 300~fs most likely related a relaxation of excited 3d electronic states (high-spin and/or intermeditate-spin) state. Both in LaCoO3 and La0.5Sr0.5CoO3, there is however a significant secondary transient structure on 4-100 ps timescale. We attribute it to a secondary wave of high-spin states generated by the excitonic recombination from intermediate-spin states.

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