NDLI: Reduction in coherent phonon lifetime in Bi 2 Te 3 / Sb 2 Te 3 superlattices

Content Provider	Semantic Scholar
Author	Wang, Yaguo Xu, Xianfan Venkatasubramanian, Rama
Copyright Year	2008
Abstract	Femtosecond pulses are used to excite A1g optical phonons in Bi2Te3, Sb2Te3, and Bi2Te3 /Sb2Te3 superlattice. Time-resolved reflectivity measurements show both the low-frequency and high-frequency components of A1g phonon modes. By comparing the phonon lifetime, it is found that the scattering rate inverse of lifetime in superlattice is significantly higher than those in Bi2Te3 and Sb2Te3. This represents the direct measurement of coherent phonon lifetime reduction in superlattice structures, consistent with the observed reduction in thermal conductivity in superlattices. © 2008 American Institute of Physics. DOI: 10.1063/1.2987518
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1103&context=nanopub
Alternate Webpage(s)	https://engineering.purdue.edu/NanoLab/PDF/2008%20Reduction%20of%20Coherent%20Phonon%20Lifetime%20in%20Bi2Te3%20Sb2Te3%20Superlattices.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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