Electron-phonon physics from first principles
Prof. Feliciano Giustino
Recorded 05 December 2018 in Lausanne, Vaud, Switzerland
Event: MARVEL NCCR - MARVEL Distinguished Lectures, Seminars and Tutorials - 2015 onwards
Electron-phonon interactions (EPIs) are ubiquitous in condensed matter and materials physics. For example EPIs play a central role in the electrical resistivity of metals, the carrier mobility of semiconductors, the pairing mechanism of conventional superconductors, and the optical properties of indirect-gap materials. More fundamentally, the EPI is the simplest realization of the interaction between fermion and boson fields, arguably one of the pillars of many-particle physics and quantum electrodynamics. The EPI has been studied for almost a century, however only during the last two decades predictive, non-empirical calculations have become possible. In this talk I will outline the theoretical and computational framework underlying modern electron-phonon calculations from first principles, and illustrate recent progress in this area by discussing representative work from our group. In particular I will touch upon our recent investigations of polarons in the angle-resolved photoelectron spectra of transition metal oxides [1,2], the superconducting pairing mechanism in transition metal dichalcogenides , non-adiabatic Kohn anomalies in the inelastic X-ray scattering spectra of doped semiconductors , and the phonon-induced renormalization of carrier effective masses in halide perovskites . I will conclude by discussing opportunities for future work, and the key challenges for advancing theoretical and computational research on electron-phonon physics .
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 J. M. Riley et al., Nat. Commun. 9, 2305 (2018).
 C. Heil et al., Phys. Rev. Lett., 119, 087003 (2017).
 F. Caruso et al., Phys. Rev. Lett. 119, 017001 (2017).
 M. Schlipdf et al., Phys. Rev. Lett. 121, 086402 (2018).
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