Publication date: 16th July 2025
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. They have sufficiently long spin relaxation and spin coherence times, which exceed the typical repetition period of 13.2 ns of the mode-locked pulsed laser operating at 76 MHz. Photogenerated spin polarization and spin coherence do not fully relax between the laser pulses and can be accelerated or decelerated by the following pulses bringing rise to several spin accumulation effects for electron and holes that we present here:
(i) Resonant spin amplification.
(ii) Spin mode locking.
(ii) Polarization recovery.
(iii) Spin inertia.
Their experimental appearance are demonstrated in MAPbI3 and (FA,Cs)Pb(I,Br)3 single crystals [1,2] and CsPb(Cl,Br)3 nanocrystals [3]. For that we use cryogenic temperature of 1.6 K and magnetic fields up to 3 Tesla, as well as time-resolved Faraday/Kerr rotation technique to generate and detect carrier spin dynamics.
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