Journal
APPLIED PHYSICS LETTERS
Volume 109, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4963889
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Funding
- European Union within FP7 project PASTRY [GA 317746]
- Leibniz Gemeinschaft within Leibniz Competition on a project Epitaxial phase change superlattices designed for investigation of non-thermal switching
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A THz-probe spectroscopy scheme with laser-induced single cycle pulses of coherent synchrotron radiation is devised and adapted to reveal the dynamic THz transmittance response in epitaxially grown phase change materials upon 800 nm fs-laser excitation. Amorphous (a-) and crystalline (c-) films of the prototypical Ge2Sb2Te5 (GST) alloy are probed with single cycle THz pulses tuned to the spectral range of the highest absorption contrast at 2 THz. After an initial instantaneous sub-picosecond (ps) dynamic THz transmittance drop, the response of a-GST in that range is dominated only by a short recovery time tau(short) = 2 ps of the excited carriers. On the contrary, the behavior of the c-GST response displays a short decay of 0.85 ps followed by a long one tau(long) = 90 ps, suggesting that vacancy layers in an ordered c-GST play a role as dissipation channel for photo-induced free carriers. Published by AIP Publishing.
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