Extended two-temperature model for ultrafast thermal response of band gap materials upon impulsive optical excitation

Taeho Shin, Samuel W. Teitelbaum, Johanna Wolfson, Maria Kandyla, Keith A. Nelson

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Thermal modeling and numerical simulations have been performed to describe the ultrafast thermal response of band gap materials upon optical excitation. A model was established by extending the conventional two-temperature model that is adequate for metals, but not for semiconductors. It considers the time- and space-dependent density of electrons photoexcited to the conduction band and accordingly allows a more accurate description of the transient thermal equilibration between the hot electrons and lattice. Ultrafast thermal behaviors of bismuth, as a model system, were demonstrated using the extended two-temperature model with a view to elucidating the thermal effects of excitation laser pulse fluence, electron diffusivity, electron-hole recombination kinetics, and electron-phonon interactions, focusing on high-density excitation.

Original languageEnglish (US)
Article number194705
JournalJournal of Chemical Physics
Volume143
Issue number19
DOIs
StatePublished - Nov 21 2015
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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