Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 56: Heterostructures, Interfaces and Surfaces II

HL 56.7: Talk

Friday, March 22, 2024, 11:00–11:15, EW 561

Light field-driven spin current generation for spintronic terahertz frequency multiplication — •Sergey Kovalev^1,2, Igor Ilyakov², Arne Brataas³, Thales Oliveira², Alexej Ponomaryov², Jan Deinert², Olav Hellwig², Jürgen Faßbender², Jürgen Lindner², and Ruslan Salikhov² — ¹Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany — ²Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ³Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway

Efficient generation and control of spin currents launched by terahertz (THz) radiation with subsequent ultrafast spin-to-charge conversion is the current challenge for the next generation of high-speed communication and data processing units. In this talk, we demonstrate that THz light can efficiently drive coherent angular momentum transfer in nanometer-thick ferromagnet/heavy-metal heterostructures. The coherently driven spin currents originate from the ultrafast spin Seebeck effect, caused by a THz-induced temperature imbalance in electronic and magnonic temperatures and fast relaxation of the electron-phonon system. Owing to the fact that the electron-phonon relaxation time is comparable with the period of a THz wave, the induced spin current results in THz second harmonic generation and THz optical rectification [1], providing a spintronic basis for THz frequency mixing and rectifying components.

[1] I. Ilyakov et al., Nature Communications 14, 7010 (2023)