Probing unfolded acoustic phonons with X rays |
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| Authors: | Trigo M Sheu Y M Arms D A Chen J Ghimire S Goldman R S Landahl E Merlin R Peterson E Reason M Reis D A |
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| Affiliation: | Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA. mtrigo@umich.edu |
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| Abstract: | Ultrafast laser excitation of an InGaAs/InAlAs superlattice (SL) creates coherent folded acoustic phonons that subsequently leak into the bulk (InP) substrate. Upon transmission, the phonons become "unfolded" into bulk modes and acquire a wave vector much larger than that of the light. We show that time-resolved x-ray diffraction is sensitive to this large-wave vector excitation in the substrate. Comparison with dynamical diffraction simulations of propagating strain supports our interpretation. |
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