Berlin 2024 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 28: Focus Session: Heat transport at the nanoscale: theory meets experiment
HL 28.5: Talk
Wednesday, March 20, 2024, 11:45–12:00, EW 203
Thermal transient grating, measuring thermal anisotropies on ultra-short length scales — •Luca Sung-Min Choi1, Moritz Meißner1, Alwin Wüthrich1, Kai Xu2, Riccardo Mincigrucci3, Laura Foglia3, Danny Fainozzi3, Filippo Bencivenga3, Sebastian Reparaz2, and Markus R. Wagner1,4 — 1Technische Universität Berlin, Berlin, Germany — 2Institut de Ciència de Materials de Barcelona, Barcelona, Spain — 3Elettra Sincrotrone Trieste, Trieste, Italy — 4Paul-Drude-Institut für Festkörperelektronik, Berlin, Germany
Optical transient thermal grating (TTG) is a contactless method to determine anisotropies of thermal transport and acoustic phonons. These physical properties can be observed by fluctuations of the complex diffraction index. Using extreme UV emission of free electron lasers (FELs), ultra-short grating lengths ranging from 110 to 26 nm can be realized. In order to illustrate the possibilities of this method using FELs as emission sources, we exemplary introduce our investigation of the strong anisotropy in the beta-phase of gallium oxide. The experiments were conducted at the Fermi Free Electron Laser [Elettra Synchrotron Trieste, dedicated endstation EIS-TIMER] on a (001)-β−Ga2O3 sample.
Keywords: TTG; FEL; thermal anisotropy; bGaO