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SUMMARY:Beyond-quasiparticles spectral functions and transport from electr
 on-phonon coupling - Jae-Mo Lihm\, Center for Computational Quantum Physic
 s\, Flatiron Institute
DTSTART:20251013T130000Z
DTEND:20251013T133000Z
UID:TALK238078@talks.cam.ac.uk
CONTACT:Dr Sun-Woo Kim
DESCRIPTION:Electron-phonon interactions play a central role in determinin
 g the spectral and transport properties of electrons at room temperature. 
 In this talk\, I will present an ab initio Green’s function-based framew
 ork for studying these effects. I will begin with a self-consistent approa
 ch to spectral functions\, which can capture satellite features more accur
 ately than the widely used Dyson-Migdal and cumulant approximations. Build
 ing on this result\, I will then discuss electronic transport. By solving 
 the ladder equations for the linear response of Green’s functions\, one 
 can account for both beyond-quasiparticle effects and vertex corrections a
 t the same time. This approach unifies and improves upon two state-of-the-
 art approaches for ab initio phonon-limited transport: the Boltzmann trans
 port equation and the bubble approximation. Finally\, I will demonstrate a
 pplications of these methods to real semiconductors and metals\, highlight
 ing results for spectral functions\, DC conductivity\, and THz optical pro
 perties.\n\nJae-Mo Lihm and Samuel Ponce\, Phys. Rev. Lett. 134\, 186401 (
 2025)\; arXiv: 2506.18139 (2025)\n
LOCATION:https://zoom.us/j/92447982065?pwd=RkhaYkM5VTZPZ3pYSHptUXlRSkppQT0
 9
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