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Seminar: Spin Dynamics in Organic Semiconductors and Organic-inorganic Halide Perovskites

Welcome to our TIAS-PRATI seminar.

Speaker: Prof. Tho Nguyen
Physics and Astronomy Department
University of Georgia, USA

Time: 9:00 Thursday, 6/6/2019.

Location: Room 101, Building B, Phenikaa University
Yen Nghia, Ha Dong, Hanoi

Title: Spin Dynamics in Organic Semiconductors and Organic-inorganic Halide Perovskites

Abstract:

Quantum technologies are aimed at exploiting genuine quantum features of systems for use in practical devices. For practical applications of such technologies, electron spins with long lifetimes are necessary for coherent manipulation of spin ensembles and molecular quantum spintronics. In my talk, I will show two material systems that might be optimal for quantum technologies. (i) Organic semiconductors (OSECs) composed by light-elements possesses weak spin-orbit coupling (SOC) and hyperfine interaction (HFI) in spins of π-conduction electrons. Therefore, the spin lifetimes in OSECs have been shown to be incredibly long. These long spin lifetimes enable applications in spin-based devices, including qubits in quantum computers, organic spin valves, and coherent spin manipulation in organic light emitting diodes. (ii) Organic-inorganic halide perovskites possess extremely strong intrinsic SOC due to the presence of the super heavy lead atoms in their structures. It has been found that in the 2D structures, such materials have structural inversion asymmetry causing extremely large Rashba type SOC. Such electrically controlled SOC opens an opportunity to manipulate the quantum spin states by an applied electric field. In addition to the fundamental studies of spin dynamics in those materials, I will introduce two on-going projects on organic light emitting diodes using thermally activated delayed fluorescence materials, and solar cells using organic-inorganic halide perovskites. Finally, for seeking potential collaboration, I will quickly introduce the other on-going research directions. Those are magneto-plasmonic nanostructures, and hydrogen gas absorptions on palladium and its alloys using various magneto-optic and spintronic methods.