Studies of electron diffusion in photo-excited Ni using time-resolved X-ray diffraction

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Abstract

We show that the heat deposition profile in a laser-excited metal can be determined by time-resolved X-ray diffraction. In this study, we investigated the electron diffusion in a 150 nm thick nickel film deposited on an indium antimonide substrate. A strain wave that mimics the heat deposition profile is generated in the metal and propagates into the InSb, where it influences the temporal profile of X-rays diffracted from InSb. We found that the strain pulse significantly deviated from a simple exponential profile, and that the two-temperature model was needed to reproduce the measured heat deposition profile. Experimental results were compared to simulations based on the two-temperature model carried out using commercial finite-element software packages and on-line dynamical diffraction tools. To reproduce the experimental data, the electron-phonon coupling factor was lowered compared to previously measured values. The experiment was carried out at a third-generation synchrotron radiation source using a high-brightness beam and an ultrafast X-ray streak camera with a temporal resolution of 3 ps.

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Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fysik
Originalspråkengelska
Artikelnummer203115
TidskriftApplied Physics Letters
Volym109
Utgåva nummer20
StatusPublished - 2016 nov 14
PublikationskategoriForskning
Peer review utfördJa

Relaterad forskningsoutput

Xiaocui Wang, 2019 maj 17, Department of Physics, Lund University. 145 s.

Forskningsoutput: AvhandlingDoktorsavhandling (sammanläggning)

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