Issue 1, 2022

Peculiar anharmonicity of Ruddlesden Popper metal halides: temperature-dependent phonon dephasing

Abstract

The anharmonicity of the Ruddlesden Popper metal-halide lattice, and its consequences for their electronic and optical properties, are paramount in their basic semiconductor physics. It is thus critical to identify specific anharmonic optical phonons that govern their photophysics. Here, we address the nature of phonon–phonon scattering probabilities of the resonantly excited optical phonons that dress the electronic transitions in these materials. Based on the temperature dependence of the coherent phonon lifetimes, we isolate the dominant anharmonic phonon and quantify its phonon–phonon interaction strength. Intriguingly, we also observe that the anharmonicity is distinct for different phonons, with a few select modes exhibiting temperature-independent coherence lifetimes, indicating their predominantly harmonic nature. However, the population and dephasing dynamics of excitons are dominated by the anharmonic phonon.

Graphical abstract: Peculiar anharmonicity of Ruddlesden Popper metal halides: temperature-dependent phonon dephasing

Supplementary files

Article information

Article type
Communication
Submitted
28 6 2021
Accepted
09 12 2021
First published
09 12 2021

Mater. Horiz., 2022,9, 492-499

Author version available

Peculiar anharmonicity of Ruddlesden Popper metal halides: temperature-dependent phonon dephasing

E. Rojas-Gatjens, C. Silva-Acuña and A. R. S. Kandada, Mater. Horiz., 2022, 9, 492 DOI: 10.1039/D1MH01010G

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