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Seminar by Jae-Mo Lihm: Computational methods for electron-phonon physics: 1-electron and 2-electron properties
Seoul National University
29.08.2022 at 14:00
Electron-phonon coupling is prevalent in all solid-state materials and affects and even determines their electronic properties. In the talk, I will review theories and recent developments in the first-principles electron-phonon physics, which allow one to study the effect of phonons on the electronic properties of real materials. In the first part of the talk, I will discuss how phonons affect the 1-particle self-energy and spectral function of electrons. Methodological developments for calculating the phonon-induced renormalization for a wider range of materials including topological insulators [1], and at a much smaller computational cost [2], will be presented. In the second part, I will describe developments in the study of phonon-limited electronic transport, which corresponds to the calculation of 2-particle correlation functions. I will introduce the concept of relaxons which are collective modes with well-defined lifetimes [3, 4], and discuss how this idea may be utilized to study transport in Hubbard models. [1] J.-M. Lihm and C.-H. Park, Phys. Rev. B 101, 121102(R) (2020) [2] J.-M. Lihm and C.-H. Park, Phys. Rev. X 11, 041053 (2021) [3] A. Cepellotti and N. Marzari, Phys. Rev. X 6, 041013 (2016) [4] J.-M. Lihm and C.-H. Park, in preparation
Room A 450 (SHARP)