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1. Parametric dependence of hot electron relaxation timescales on electron-electron and electron-phonon interaction strengths

   https://doi.org/10.1038/s42005-020-00442-x  

   Wilson, Richard B. ; Coh, Sinisa ( December 2020 , Communications Physics)

   null (Ed.)

   Abstract Understanding how photoexcited electron dynamics depend on electron-electron (e-e) and electron-phonon (e-p) interaction strengths is important for many fields, e.g. ultrafast magnetism, photocatalysis, plasmonics, and others. Here, we report simple expressions that capture the interplay of e-e and e-p interactions on electron distribution relaxation times. We observe a dependence of the dynamics on e-e and e-p interaction strengths that is universal to most metals and is also counterintuitive. While only e-p interactions reduce the total energy stored by excited electrons, the time for energy to leave the electronic subsystem also depends on e-e interaction strengths because e-e interactions increase the number of electrons emitting phonons. The effect of e-e interactions on energy-relaxation is largest in metals with strong e-p interactions. Finally, the time high energy electron states remain occupied depends only on the strength of e-e interactions, even if e-p scattering rates are much greater than e-e scattering rates. 

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2. Electron spectra for twisted electron collisions

   https://doi.org/10.1088/1361-6455/ac41b1  

   Plumadore, A ; Harris, A L ( December 2021 , Journal of Physics B: Atomic, Molecular and Optical Physics)

   Abstract Ionization collisions have important consequences in many physical phenomena, and the mechanism that leads to ionization is not universal. Double differential cross sections (DDCSs) are often used to identify ionization mechanisms because they exhibit features that distinguish close collisions from grazing collisions. In the angular DDCS, a sharp peak indicates ionization through a close binary collision, while a broad angular distribution points to a grazing collision. In the DDCS energy spectrum, electrons ejected through a binary encounter collision result in a peak at an energy predicted from momentum conservation. These insights into ionization processes are well-established for plane wave projectiles. However, the recent development of sculpted particle wave packets reopens the question of how ionization occurs for these new particle wave forms. We present theoretical DDCSs for (e, 2e) ionization of atomic hydrogen for electron vortex projectiles. Our results predict that the ionization mechanism for vortex projectiles is similar to that of non-vortex projectiles, but that the projectile’s momentum uncertainty causes noticeable changes to the shape and magnitude of the vortex DDCSs. Specifically, there is a broadening and splitting of the angular DDCS peak for vortex projectiles, and an increase in the cross section for high energy ejected electrons. 

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3. Electron-Electron Interactions in Artificial Graphene

   https://doi.org/10.1103/PhysRevLett.108.246803  

   Räsänen, E. ; Rozzi, C. A. ; Pittalis, S. ; Vignale, G. ( June 2012 , Physical Review Letters)
4. Electron-electron collision dynamics of the four-electron escape in Be close to threshold

   https://doi.org/10.1103/PhysRevA.87.043428  

   Emmanouilidou, A. ; Price, H. ( April 2013 , Physical Review A)
5. Separation of electron–electron and electron–proton correlation in multicomponent orbital-optimized perturbation theory

   https://doi.org/10.1063/5.0006743  

   Fajen, O. Jonathan ; Brorsen, Kurt R. ( May 2020 , The Journal of Chemical Physics)