Dmitri Yakovlev

Abstract The optical response of semiconductors is governed by coupled electronic and vibrational excitations. In lead-halide perovskite nanocrystals, strong exciton–phonon interaction forms a ladder of exciton-polaron states accessible by femtosecond laser pulses. We demonstrate a fully coherent regime of exciton-polaron dynamics with long optical coherence times (T2 ≈ 300 ps) in CsPbI3 nanocrystals embedded in glass.

Abstract Optical generation of coherent transverse phonons by femtosecond light pulses is appealing for sub-terahertz high-speed active control of material properties. Lead-free double-perovskite semiconductors, such as Cs2AgBiBr6, attract particular interest in this respect due to their structural phase transition and strong carrier-lattice coupling.

1 Introduction Lead halide perovskite semiconductors have evolved toward a versatile platform for photovoltaic and optoelectronic applications.[1-3] Their spin-dependent properties are promising for spintronic and spin-orbitronic applications.[1, 4-6] Band structure and crystal symmetry of the lead halide perovskites differ considerably from that of conventional III-V and II-VI semiconductors with zinc blende structure, establishing them as novel material platform for the spin physics of...