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

@inproceedings{Wang2008ReductionIC,
  title={Reduction in coherent phonon lifetime in Bi 2 Te 3 / Sb 2 Te 3 superlattices},
  author={Yaguo Wang and Xianfan Xu and Rama Venkatasubramanian},
  year={2008}
}
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… CONTINUE READING