Coherent Spin Precession and Lifetime-Limited Spin Dephasing in CsPbBr3 Perovskite Nanocrystals
arXiv:2011.10119 · doi:10.1021/acs.nanolett.0c03329
Abstract
Carrier spins in semiconductor nanocrystals are promising candidates for quantum information processing. Using a combination of time-resolved Faraday rotation and photoluminescence spectroscopies, we demonstrate optical spin polarization and coherent spin precession in colloidal CsPbBr3 nanocrystals that persists up to room temperature. By suppressing the influence of inhomogeneous hyperfine fields with a small applied magnetic field, we demonstrate inhomogeneous hole transverse spin-dephasing times (T2*) that approach the nanocrystal photoluminescence lifetime, such that nearly all emitted photons derive from coherent hole spins. Thermally activated LO phonons drive additional spin dephasing at elevated temperatures, but coherent spin precession is still observed at room temperature. These data reveal several major distinctions between spins in nanocrystalline and bulk CsPbBr3 and open the door for using metal-halide perovskite nanocrystals in spin-based quantum technologies.
arXiv commentAccepted for publication at Nano Letters, 11/19/20
References in corpus (18)
- New Tolerance Factor to Predict the Stability of Perovskite Oxides and Halides
- Bright triplet excitons in lead halide perovskites
- Electron spin relaxation by nuclei in semiconductor quantum dots
- Coherent Single Photon Emission from Colloidal Lead Halide Perovskite Quantum Dots
- Room Temperature Initialisation and Readout of Intrinsic Spin Defects in a Van der Waals Crystal
- Hybrid quantum repeater using bright coherent light
- Spin decoherence of a heavy hole coupled to nuclear spins in a quantum dot
- Theory of control of spin/photon interface for quantum networks
- Pure quantum dephasing of a solid state electron spin qubit in a large nuclear spin bath coupled by long-range hyperfine-mediated interactions
- Coherent spin dynamics of electrons and holes in CsPbBr perovskite crystals
- Long Exciton Dephasing Time and Coherent Phonon Coupling in CsPbBrCl Perovskite Nanocrystals
- Isotope sensitive measurement of the hole-nuclear spin interaction in quantum dots
- Efficient dynamical nuclear polarization in quantum dots: Temperature dependence
- Long-lived electron spin coherence in CdSe/ZnSSe self-assembled quantum dots
- Reexamination of the Elliott-Yafet spin-relaxation mechanism
- Elastic Spin Relaxation Processes in Semiconductor Quantum Dots
- Temperature induced spin coherence dissipation in quantum dots
- Rashba-effect-induced spin dephasing in n-typed InAs quantum wells
Cited by in corpus (8)
- Lattice distortion inducing exciton splitting and coherent quantum beating in CsPbI3 perovskite quantum dots
- Room-temperature coherent optical manipulation of single-hole spins in solution-grown perovskite quantum dots
- Mode locking of hole spin coherences in CsPb(Cl,Br) perovskite nanocrystals
- Spin dynamics of electrons and holes interacting with nuclei in MAPbI perovskite single crystals
- Tailoring the electron and hole Landé factors in lead halide perovskite nanocrystals by quantum confinement and halide exchange
- Coherent Spin Dynamics of Electrons in Two-Dimensional (PEA)PbI Perovskites
- Spin Coherence and Spin Relaxation in Hybrid Organic-Inorganic Lead and Mixed Lead-Tin Perovskites
- Perovskite Nanocrystals as Emerging Single-Photon Emitters: Progress, Challenges, and Opportunities