Spin-orbit coupling, spin relaxation, and spin diffusion in organic solids

Zhi-Gang Yu

doi:10.1117/12.919390

22 February 2012 Spin-orbit coupling, spin relaxation, and spin diffusion in organic solids

Zhi-Gang Yu

Proceedings Volume 8333, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Devices and Integration; 83331A (2012) https://doi.org/10.1117/12.919390
Event: Photonics and Optoelectronics Meetings 2011, 2011, Wuhan, China

Abstract

We develop a systematic approach of quantifying spin-orbit coupling (SOC) and a rigorous theory of carrier spin relaxation caused by the SOC in disordered organic solids. The SOC mixes up- and down-spin in the polaron states and can be characterized by an admixture parameter. The spin relaxation rate is found to be proportional to the carrierhopping rate, or equivalently, carrier mobility. The spin diffusion length depends on the spin mixing and hopping distance but is insensitive to the carrier mobility. The SOCs in tris-(8-hydroxyquinoline) aluminum (Alq₃) and in copper phthalocyanine (CuPc) are particularly strong, due to the orthogonal arrangement of the three ligands in the former and Cu 3d orbitals in the latter.The theory quantitatively explains the recent measured spin diffusion lengths in Alq₃ from muon spin rotation and in CuPc from spin-polarized two-photon photoemission.

Citation Download Citation

Zhi-Gang Yu "Spin-orbit coupling, spin relaxation, and spin diffusion in organic solids", Proc. SPIE 8333, Photonics and Optoelectronics Meetings (POEM) 2011: Optoelectronic Devices and Integration, 83331A (22 February 2012); https://doi.org/10.1117/12.919390

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KEYWORDS

Diffusion

System on a chip

Polarons

Solids

Molecules

Copper

Electrons

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