Resonant spin amplification and accumulation in MAPbI$_3$ single crystals

TL;DR

This study investigates spin dynamics in MAPbI$_3$ single crystals, demonstrating long spin relaxation times and spin accumulation effects, positioning lead halide perovskites as promising materials for quantum spintronic applications.

Contribution

It provides the first detailed measurement of spin relaxation and dephasing times in MAPbI$_3$ crystals and explores spin accumulation via resonant spin amplification and related techniques.

Findings

Long electron spin relaxation time of 30 ns

Observation of spin accumulation effects

Potential for quantum spintronic applications

Abstract

Quantum technologic and spintronic applications require reliable semiconducting materials that enable a significant, long-living spin polarization of electronic excitations and offer the ability to manipulate it optically in an external field. Due to the specifics of band structure and remarkable spin-dependent properties, the lead halide perovskite semiconductors are suitable candidates for that. Here, the carrier spin dynamics in a MAPbI$_3$ (MA = methylammonium) perovskite single crystal with thickness of 20 $\mu$m are studied by the time-resolved Kerr ellipticity technique at cryogenic temperatures. Long times of longitudinal electron spin relaxation $T_1 = 30$ ns and transverse electron spin dephasing $T_{2,e}^*=21$ ns are found. The spin dynamics lasting longer than the applied laser pulse repetition period give rise to spin accumulation effects. We exploit them through the resonant spin amplification, polarization recovery, and spin inertia techniques to study the electron and hole spin systems coupled with the nuclear spins. These results establish the lead halide perovskite semiconductors as suitable platform for quantum technologies relying on spin-dependent phenomena.