Spin Polarization Dynamics of Free Charge Carriers in CsPbI<sub>3</sub> Nanocrystals
Simone Strohmair, Amrita Dey, Yu Tong, Lakshminarayana Polavarapu, Bernhard J. Bohn, Jochen Feldmann
Abstract
nanocrystals by employing time-resolved differential transmission spectroscopy (DTS). We find that the photoinduced spin polarization significantly diminishes during thermalization and cooling toward the energetically favorable band edge. Temperature-dependent DTS reveals a decay in spin polarization that is more than 1 order of magnitude faster at room temperature (3 ps) than at cryogenic temperatures (32 ps). We propose that spin relaxation of free charge carriers in large-SOC materials like LHPs occurs as a result of carrier-phonon scattering, as described by the Elliott-Yafet mechanism.
Topics & Concepts
Charge carrierCondensed matter physicsMaterials scienceSpinsSpin polarizationFemtosecondScatteringPhononMolecular physicsChemical physicsChemistryPhysicsElectronOpticsQuantum mechanicsLaserPerovskite Materials and ApplicationsChalcogenide Semiconductor Thin FilmsQuantum Dots Synthesis And Properties