Non-thermal hot electrons ultrafastly generating hot optical phonons in graphite.

Scientific Reports
Y IshidaS Shin

Abstract

Investigation of the non-equilibrium dynamics after an impulsive impact provides insights into couplings among various excitations. A two-temperature model (TTM) is often a starting point to understand the coupled dynamics of electrons and lattice vibrations: the optical pulse primarily raises the electronic temperature T(el) while leaving the lattice temperature T(l) low; subsequently the hot electrons heat up the lattice until T(el) = T(l) is reached. This temporal hierarchy owes to the assumption that the electron-electron scattering rate is much larger than the electron-phonon scattering rate. We report herein that the TTM scheme is seriously invalidated in semimetal graphite. Time-resolved photoemission spectroscopy (TrPES) of graphite reveals that fingerprints of coupled optical phonons (COPs) occur from the initial moments where T(el) is still not definable. Our study shows that ultrafast-and-efficient phonon generations occur beyond the TTM scheme, presumably associated to the long duration of the non-thermal electrons in graphite.

References

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Citations

Jan 23, 2016·Structural Dynamics·Renske M van der VeenAhmed H Zewail
Jan 3, 2015·The Review of Scientific Instruments·Y IshidaS Shin
Jul 21, 2016·Journal of the American Chemical Society·Luciano ColazzoMauro Sambi
Jan 4, 2017·The Review of Scientific Instruments·Y IshidaY Kobayashi
Apr 22, 2014·Physical Review Letters·Sunghun KimFumio Komori
Apr 29, 2014·Physical Review Letters·T G WhiteG Gregori
Jun 3, 2021·Chemical Reviews·Ryland C ForsytheAstrid M Müller

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Software Mentioned

TrPES

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