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- Title
Interpreting pulse-shape effects in pump-probe spectroscopies.
- Authors
Shvaika, A. M.; Matveev, O. P.; Devereaux, T. P.; Freericks, J. K.
- Abstract
The effect of the pulse-shape on pump-probe spectroscopies is examined for the simplest model of noninteractingfermions on an infinite-dimensional hypercubic lattice. The probe-modified density of states follows the time evolution of the pump and displays narrowing and Floquet-like sidebands at the pump maximum, whereas the photoelectron spectra are also strongly affected by the nonequilibrium occupation of the single-particle states due to the excitation from the pump. The nonequilibrium Raman cross section is derived, and the nonresonant one in both the A \ g and B \g symmetries contains a number of peaks at the pump maximum, which can be attributed to an interference effect or Brillouin scattering off the time variations of the stress tensor. Both the "measured" occupation of single-particle states and the ratio of Stokes to anti-Stokes peaks are strongly modified by the probe-pulse width, which must be included in the interpretation of experimental results.
- Subjects
SPECTROMETRY; NON-equilibrium reactions; ANTI-Stokes scattering; BRILLOUIN scattering; FLOQUET theory
- Publication
Condensed Matter Physics, 2018, Vol 21, Issue 3, p1
- ISSN
1607-324X
- Publication type
Article
- DOI
10.5488/CMP.21.33707