Title

Anharmonic Lattice Dynamics In Germanium Measured With Ultrafast X-Ray Diffraction

Abstract

The ultrafast, acoustic phonon dynamics in a germanium/silicon layered structure, measuring atomic vibrations with 10-fm resolution, were measured using ultrafast X-ray diffraction. The fluence dependence of the oscillations directly yields the temperature dependent coherence rates resulting from anharmonic lattice dynamics within the germanium film. The observed damping was attributed to the four-body elastic dephasing processes which originate largely from four-body interactions that cause decoherence in the evolution of the mode. Ultrafast X-ray diffraction allows direct measurement of coherent acoustic excitations before their thermalization with the environment.

Publication Date

7-17-2000

Publication Title

Physical Review Letters

Volume

85

Issue

3

Number of Pages

586-589

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1103/PhysRevLett.85.586

Socpus ID

20644466224 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/20644466224

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