Петар Митрић

02. априла 2024.

У оквиру семинара Центра за изучавање комплексних система Института за физику у Београду, у четвртак, 04. априла 2024. године у 14 часова у читаоници библиотеке „др Драган Поповић“, Петар Митрић (Институт за физику у Београду) одржаће предавање:

Exploring Polarons in Semiconductors: Insights from the Holstein Model


The electron-phonon interaction significantly affects the properties of semiconducting materials, leading to the emergence of polarons — a new quasiparticle that now, instead of the electron, plays the role of the current carrier in our system. The polarons are often studied using theoretically idealized models, the simplest of which is the Holstein model. In this talk, we show that within this model, the dynamical mean-field theory can be used to obtain almost numerically exact results for both the quasiparticle and single particle properties, regardless of the electron-phonon coupling strength, phonon frequency, or temperature [1]. Surprisingly, this remains true regardless of the dimensionality of our system. Furthermore, we use these results as a benchmark to test the reliability of the increasingly popular cumulant expansion method for the calculation of various quantities in a wide range of regimes [2]. At the end, we examine the transport properties within the Holstein model which was our original motivation at the start of this study.

[1] P. Mitrić, V. Janković, N. Vukmirović, and D. Tanasković, Phys. Rev. Lett., 129, 096401 (2022).

[2] P. Mitrić, V. Janković, N. Vukmirović, and D. Tanasković, Phys. Rev. B, 107, 125165 (2023).