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Journal of Applied Physics : Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique

By Alexandre A. Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye et al

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Book Id: WPLBN0002169323
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 19 November 2008

Title: Journal of Applied Physics : Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique  
Author: Alexandre A. Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye et al
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Kolomenskii, Sergey N. Jerebtsov, Haidong Liu, Hong Zhang, Zuxin Ye Et A, A. A. (n.d.). Journal of Applied Physics : Observation of coherent acoustic and optical phonons in bismuth nanowires by a femtosecond pump-probe technique. Retrieved from http://nationalpubliclibrary.com/


Description
Description: Coherent acoustic and optical phonon oscillations in Bi nanowire samples were studied with a femtosecond pump-probe technique. Laser pulses of 50 fs excited simultaneously acoustic oscillations at a frequency of about 9.5 GHz and optical phonons in the terahertz range. The transmission signal of nanowires on a glass substrate and the signal of light scattered from freestanding nanowires were measured. The acoustic velocity in nanowires was found to be close to that of bulk polycrystalline material. The changes in the optical phonon frequency at different laser fluences were simulated taking into account excitation inhomogeneity, lattice anharmonicity, diffusion, and recombination of the carriers and gave good agreement with experimental results.

 

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