The spin physics of perovskite nanocrystals with confined electrons or holes is attracting increasing attention, both for fundamental studies and spintronic applications. Here, stable CsPb(Cl0.5Br0.5)3 lead halide perovskite nanocrystals embedded in a fluorophosphate glass matrix are studied by time-resolved optical spectroscopy to unravel the coherent spin dynamics of holes and their interaction with nuclear spins of the 207Pb isotope. We demonstrate the spin mode locking effect provided by the synchronization of the Larmor precession of single hole spins in each nanocrystal in the ensemble that are excited periodically by a laser in an external magnetic field. The mode locking is enhanced by nuclei-induced frequency focusing. An ensemble spin dephasing time T2∗ of a nanosecond and a single hole spin coherence time of T2=13ns are measured. The developed theoretical model accounting for the mode locking and nuclear focusing for randomly oriented nanocrystals with perovskite band structure describes the experimental data very well.
@article{arxiv.2206.13323,
title = {Mode locking of hole spin coherences in CsPb(Cl,Br)$_3$ perovskite nanocrystals},
author = {E. Kirstein and N. E. Kopteva and D. R. Yakovlev and E. A. Zhukov and E. V. Kolobkova and M. S. Kuznetsova and V. V. Belykh and I. A. Yugova and M. M. Glazov and M. Bayer and A. Greilich},
journal= {arXiv preprint arXiv:2206.13323},
year = {2023}
}
Comments
Main paper of 9 pages and 3 figures. Supplementary material of 16 pages and 12 figures