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HL: Fachverband Halbleiterphysik

HL 28: Focus Session: Heat transport at the nanoscale: theory meets experiment

HL 28.5: Vortrag

Mittwoch, 20. März 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. Wagner^1,4 — 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