Phys. Rev. Lett. 77, 3661–3664 (1996)Coherent THz Phonons Driven by Light Pulses and the Sb Problem: What is the Mechanism?Received 23 July 1996; published in the issue dated 21 October 1996 Femtosecond laser pulses generate in Sb coherent Eg phonons at ≈3.4 THz, in addition to oscillations of A1g symmetry accounted for by the phenomenological displacive-excitation model. Experiments agree with theoretical calculations showing that the coherent driving force in absorbing materials like Sb is determined by Raman processes, as in transparent media. The Raman formalism provides a unifying approach for describing light-induced motion of atoms of both impulsive and displacive character. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.77.3661
DOI:
10.1103/PhysRevLett.77.3661
PACS:
78.47.+p, 63.20.Kr, 78.30.-j
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.