Phys. Rev. Lett. 101, 025505 (2008) [4 pages]

Probing Unfolded Acoustic Phonons with X Rays

Abstract

References

Citing Articles (8)

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M. Trigo^1,*, Y. M. Sheu¹, D. A. Arms², J. Chen¹, S. Ghimire¹, R. S. Goldman³, E. Landahl^2,†, R. Merlin¹, E. Peterson¹, M. Reason³, and D. A. Reis¹
¹Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA
²Advanced Photon Source, Argonne, Illinois 60439, USA
³Department of Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109, USA

Received 6 May 2008; published 11 July 2008

See accompanying Physics Focus

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.

URL:

http://link.aps.org/doi/10.1103/PhysRevLett.101.025505

DOI:

10.1103/PhysRevLett.101.025505

PACS:

63.22.−m, 78.47.−p

^*mtrigo@umich.edu

^†Present address: Department of Physics, DePaul University, Chicago, IL, USA.

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Phys. Rev. Lett. 101, 025505 (2008) [4 pages]

Probing Unfolded Acoustic Phonons with X Rays