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Fourier-transform i...
Fourier-transform inelastic X-ray scattering from time- and momentum-dependent phonon-phonon correlations
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Trigo, M. (author)
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Fuchs, M. (author)
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Chen, J. (author)
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Jiang, M. P. (author)
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Cammarata, M. (author)
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Fahy, S. (author)
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Fritz, D. M. (author)
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Gaffney, K. (author)
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Ghimire, S. (author)
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Higginbotham, A. (author)
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Johnson, S. L. (author)
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Kozina, M. E. (author)
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- Larsson, Jörgen (author)
- Lund University,Lunds universitet,Atomfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Atomic Physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH
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Lemke, H. (author)
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Lindenberg, A. M. (author)
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Ndabashimiye, G. (author)
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Quirin, F. (author)
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Sokolowski-Tinten, K. (author)
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Uher, C. (author)
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Wang, G. (author)
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Wark, J. S. (author)
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Zhu, D. (author)
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Reis, D. A. (author)
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(creator_code:org_t)
- 2013
- 2013
- English.
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In: Nature Physics. - 1745-2473. ; 9:12, s. 790-794
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Abstract
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- The macroscopic characteristics of a material are determined by its elementary excitations, which dictate the response of the system to external stimuli. The spectrum of excitations is related to fluctuations in the density-density correlations and is typically measured through frequency-domain neutron(1) or X-ray(2-4) scattering. Time-domain measurements of these correlations could yield a more direct way to investigate the excitations of solids and their couplings both near to and far from equilibrium. Here we show that we can access large portions of the phonon dispersion of germanium by measuring the diffuse scattering from femtosecond X-ray free-electron laser pulses. A femtosecond optical laser pulse slightly quenches the vibrational frequencies, producing pairs of high-wavevector phonons with opposite momenta. These phonons manifest themselves as time-dependent coherences in the displacement correlations(5) probed by the X-ray scattering. As the coherences are preferentially created in regions of strong electron-phonon coupling, the time-resolved approach is a natural spectroscopic tool for probing low-energy collective excitations in solids, and their microscopic interactions.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Trigo, M.
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Fuchs, M.
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Chen, J.
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Jiang, M. P.
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Cammarata, M.
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Fahy, S.
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show more...
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Fritz, D. M.
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Gaffney, K.
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Ghimire, S.
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Higginbotham, A.
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Johnson, S. L.
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Kozina, M. E.
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Larsson, Jörgen
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Lemke, H.
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Lindenberg, A. M ...
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Ndabashimiye, G.
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Quirin, F.
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Sokolowski-Tinte ...
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Uher, C.
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Wang, G.
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Wark, J. S.
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Zhu, D.
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Reis, D. A.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Nature Physics
- By the university
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Lund University