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In this study we report on the investigation of epitaxially grown Sb 2 Te 3 by employing Fourier-Transform transmission Spectroscopy (FTS) with laser-induced Coherent Synchrotron Radiation (CSR) in the Terahertz (THz) spectral range. Static spectra in the range between 20 and 120 cm− 1 highlight a peculiar softening of an in-plane IR-active phonon mode upon temperature decrease, as opposed to all Raman active modes which instead show a hardening upon temperature decrease in the same energy range. The phonon mode softening is found to be accompanied by an increase of free carrier concentration. A strong coupling of the two systems (free carriers and phonons) is observed and further evidenced by exciting the same phonon mode at 62 cm− 1 within an ultrafast pump-probe scheme employing a femtosecond laser as pump and a CSR single cycle THz pulse as probe. Separation of the free carrier …
Nature Publishing Group
Publication date: 
31 Jul 2020

V Bragaglia, M Ramsteiner, D Schick, JE Boschker, R Mitzner, R Calarco, K Holldack

Biblio References: 
Volume: 10 Issue: 1 Pages: 1-9
Scientific reports