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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 75: Frontiers in Electronic-Structure Theory - Focus on Electron-Phonon Interactions IV (joint session O/CPP/DS/HL)
CPP 75.1: Hauptvortrag
Mittwoch, 18. März 2020, 15:00–15:30, GER 38
Electron-phonon interactions in realistic materials — •Fabio Caruso — Institut für Physik und IRIS Adlershof, Humboldt-Universität zu Berlin, Germany
Functional materials used in actual devices are typically doped, they operate at finite temperature, and they may be subject to perturbations such as, e.g., external fields and light pulses. These aspects may alter profoundly the electron-phonon interaction (EPI), its influence on the electronic properties of solids, and even lead to the manifestation of novel emergent phenomena absent in perfect crystals.
We conducted a first-principles investigation of the EPI in functional materials at realistic operational conditions based on many-body perturbation theory. Our work reveals that: (i) n-type doping of polar oxides, such as EuO and TiO2, allows one to trigger and control the formation of polarons (electrons dressed by a phonon cloud) [1]; (ii) in the record-breaking thermoelectric material SnSe, temperature may lead to a five-fold suppression of carrier lifetimes due to enhanced phonon emission [2]. Overall, the striking sensitivity to doping, temperature, and external fields, makes the EPI a powerful tool to tailor the opto-electronic properties of quantum materials. Possible strategies to extend the many-body theory of the EPI to the study of time-dependent phenomena will further be discussed [3].
[1] J. Riley, F. Caruso, C. Verdi, et al., Nature Commun. 9 (1), 2305 (2018). [2] F. Caruso, M. Troppenz, S. Rigamonti, C. Draxl, Phys. Rev. B 99 (8), 081104 (2019). [3] F. Caruso, D. Novko, C. Draxl, arXiv:1909.06549v (2019).