High temperature electron spin dynamics in bulk cubic GaN: Nanosecond spin lifetimes far above room-temperature

Buß, J. H.; Schaëfer, Andreas; Schupp, T.; As, D. J.; Hägele, D.; Rudolph, J.

doi:10.1063/1.4901108

Cited by 11 publications

(1 citation statement)

References 41 publications

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“…A direct spin-phonon process, which may become important in spin relaxation under strong magnetic fields (>1 T), is not effective at low magnetic fields (<1 mT), under which exciton spin lifetimes are obtained . Since the measured material is bulk CH 3 NH 3 PbI 3 and the strong SOC associated with heavy elements has been consistently included in the electronic structure, we neglect extrinsic heavy-element or magnetic impurities and structural/composition fluctuations, − which can contribute to spin relaxation in III–V semiconductors and alloys, particularly in low-dimensional structures. The BAP mechanism originates from exchange-induced spin flip scattering between electrons and holes.…”

Section: Methods and Resultsmentioning

confidence: 99%

Unraveling the Spin Relaxation Mechanism in Hybrid Organic–Inorganic Perovskites

2019

J. Phys. Chem. C

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The hybrid organic−inorganic perovskite (HOIP) CH 3 NH 3 PbI 3 exhibits a long spin coherence despite its strong spin−orbit coupling. Elucidation of the spin relaxation mechanism is a prerequisite to harness this spin coherence for spintronic applications. Here, we show that exciton spin relaxation behaviors can be quantitatively accounted for by the Rashba splitting in the exciton bands together with piezoelectric (PE) coupling, both arising from structural inversion asymmetry of HOIPs. A large exciton size and Debye screening influence piezoelectric scattering and result in the unusual temperature and photoexcitation dependences in spin relaxation. Our results suggest that the strong PE coupling helps retain spin coherence in HOIPs with strong spin−orbit coupling and Rashba splittings.

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