Coherent spin dynamics of electrons and holes in CsPbBr$_3$ perovskite crystals

TL;DR

This study investigates the coherent spin dynamics of electrons and holes in high-quality CsPbBr3 perovskite crystals, revealing their potential for spintronics applications through detailed spectroscopic analysis of spin properties.

Contribution

It provides a comprehensive experimental analysis of exciton and charge carrier spin properties in CsPbBr3, highlighting their suitability for spintronics due to unique band structure features.

Findings

Measured exciton and charge carrier g-factors.

Determined spin relaxation times.

Analyzed hyperfine interactions in perovskites.

Abstract

The lead halide perovskites demonstrate huge potential for optoelectronic applications, high energy radiation detectors, light emitting devices and solar energy harvesting. Those materials exhibit strong spin-orbit coupling enabling efficient optical orientation of carrier spins in perovskite-based devices with performance controlled by a magnetic field. Perovskites are promising for spintronics due to substantial bulk and structure inversion asymmetry, however, their spin properties are not studied in detail. Here we show that elaborated time-resolved spectroscopy involving strong magnetic fields can be successfully used for perovskites. We perform a comprehensive study of high-quality CsPbBr$_3$ crystals by measuring the exciton and charge carrier $g$-factors, spin relaxation times and hyperfine interaction of carrier and nuclear spins by means of coherent spin dynamics. Owing to their "inverted" band structure, perovskites represent appealing model systems for semiconductor spintronics exploiting the valence band hole spins, while in conventional semiconductors the conduction band electrons are considered for spin functionality.