Regensburg 2022 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 21: Terahertz Spintronics

MA 21.8: Vortrag

Mittwoch, 7. September 2022, 11:15–11:30, H43

Laser-induced charge and spin photocurrents in BiAg₂ surface from first-principles — •Theodoros Adamantopoulos^1,2, Maximilian Merte^1,2,3, Frank Freimuth^1,3, Dongwook Go^1,3, Stefan Blügel¹, and Yuriy Mokrousov^1,3 — ¹Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA, 52425 Jülich, Germany — ²Department of Physics, RWTH Aachen University, 52056 Aachen, Germany — ³Institute of Physics, Johannes Gutenberg University Mainz, 55099 Mainz, Germany

The physics of photo-induced effects in interfacial systems is intensively researched these days owing to numerous potential applications. Owing to the complexity of the problem, a comprehensive theoretical picture of photogalvanic effects is still lacking. Here we perform first-principles calculations of laser-induced currents in a BiAg₂ surface alloy, which is a well-known material realization of the Rashba model [1, 2]. Our results confirm the emergence of very large in-plane photocurrents as predicted by the Rashba model and establish a benchmark picture of photocurrents at Rashba-like surfaces and interfaces [3]. This work contributes to the study of the role of the interfacial Rashba spin-orbit interaction as a mechanism for the generation of in-plane photocurrents, which are of great interest in the field of ultrafast and terahertz spintronics.

[1] F. Freimuth et al., Phys. Rev. B 103, 075428 (2021). [2] F. Freimuth et al., Phys. Rev. B 94, 144432 (2016). [3] T. Adamantopoulos et al., arXiv:2201.07122 (2022).