Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well.
Coherent folded acoustic phonons in a multilayered GaSb/InAs epitaxial heterostructure were generated by femtosecond laser pulses and studied by means of ultrafast x-ray diffraction. Coherent phonons excited simultaneously in the fundamental acoustic branch and the first back-folded branch were dete...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2005
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| _version_ | 1826264121672204288 |
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| author | Sondhauss, P Larsson, J Harbst, M Naylor, G Plech, A Scheidt, K Synnergren, O Wulff, M Wark, J |
| author_facet | Sondhauss, P Larsson, J Harbst, M Naylor, G Plech, A Scheidt, K Synnergren, O Wulff, M Wark, J |
| author_sort | Sondhauss, P |
| collection | OXFORD |
| description | Coherent folded acoustic phonons in a multilayered GaSb/InAs epitaxial heterostructure were generated by femtosecond laser pulses and studied by means of ultrafast x-ray diffraction. Coherent phonons excited simultaneously in the fundamental acoustic branch and the first back-folded branch were detected. This represents the first clear evidence for phonon branch folding based directly on the atomic motion to which x-ray diffraction is sensitive. From a comparison of the measured phonon-modulated x-ray reflectivity with simulations, evidence was found for a reduction of the laser penetration depth. This reduction can be explained by the self-modulation of the refractive index due to photogenerated free carriers. |
| first_indexed | 2024-03-06T20:02:40Z |
| format | Journal article |
| id | oxford-uuid:27da1122-3b49-4e32-9f79-2f2dadcde554 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:02:40Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:27da1122-3b49-4e32-9f79-2f2dadcde5542022-03-26T12:09:19ZPicosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:27da1122-3b49-4e32-9f79-2f2dadcde554EnglishSymplectic Elements at Oxford2005Sondhauss, PLarsson, JHarbst, MNaylor, GPlech, AScheidt, KSynnergren, OWulff, MWark, JCoherent folded acoustic phonons in a multilayered GaSb/InAs epitaxial heterostructure were generated by femtosecond laser pulses and studied by means of ultrafast x-ray diffraction. Coherent phonons excited simultaneously in the fundamental acoustic branch and the first back-folded branch were detected. This represents the first clear evidence for phonon branch folding based directly on the atomic motion to which x-ray diffraction is sensitive. From a comparison of the measured phonon-modulated x-ray reflectivity with simulations, evidence was found for a reduction of the laser penetration depth. This reduction can be explained by the self-modulation of the refractive index due to photogenerated free carriers. |
| spellingShingle | Sondhauss, P Larsson, J Harbst, M Naylor, G Plech, A Scheidt, K Synnergren, O Wulff, M Wark, J Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title | Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title_full | Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title_fullStr | Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title_full_unstemmed | Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title_short | Picosecond x-ray studies of coherent folded acoustic phonons in a multiple quantum well. |
| title_sort | picosecond x ray studies of coherent folded acoustic phonons in a multiple quantum well |
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