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Sökning: WFRF:(Plech A.)

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1.
  • Sondhauss, Peter, et al. (författare)
  • Picosecond X-ray studies of coherent folded phonons in a multiple quantum well
  • 2005
  • Ingår i: Physical Review Letters. - Lund Univ, Dept Phys, SE-22100 Lund, Sweden. European Synchrotron Radiat Facil, F-38043 Grenoble, France. Malmo Univ, Sch Technol & Soc, S-20506 Malmo, Sweden. Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England. : AMERICAN PHYSICAL SOC. - 1079-7114 .- 0031-9007. ; 94
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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2.
  • Sondhauss, Peter, et al. (författare)
  • Time resolved X-ray diffraction and non-thermal inelastic X-ray scattering
  • 2004
  • Ingår i: AIP Conference Proceedings. - 1551-7616 .- 0094-243X. ; 705, s. 1387-1390
  • Konferensbidrag (refereegranskat)abstract
    • Atomic processes like e.g. molecular vibrations, chemical reactions or phase transitions happen on picosecond down to femtosecond time scales. Novel pulsed X-ray sources or alternatively ultrafast X-ray detectors allow the investigation of these processes in real time. A powerful tool for the investigation of the dynamics in crystalline materials is time resolved X-ray diffraction (TRXD). As an example the authors present the measurement of "phonon branch folding" in a GaSb/InAs superlattice by means of TRXD. In the second part we look forward to the near future of TRXD. X-ray scattering from coherent acoustic and optical phonons has recently become describable within the framework of dynamical diffraction theory. This theory provides the means for the detailed modeling of how various lattice dynamical processes manifest themselves in the diffracted X-ray signal. Simulations are presented showing the effects of coherent acoustic and optical phonons on the rocking curve of quartz (010)
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  • Resultat 1-2 av 2
Typ av publikation
konferensbidrag (1)
tidskriftsartikel (1)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Sondhauss, Peter (2)
Synnergren, Ola (2)
Wark, J S (2)
Harbst, Michael (2)
Scheidt, K (2)
Naylor, G. A (2)
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Plech, A (2)
Larsson, J. (1)
WULFF, M (1)
Larsson, Jörgen (1)
Wulf, M (1)
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Lunds universitet (2)
Malmö universitet (1)
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Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)

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