SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.35: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

Terahertz third harmonic generation from a correlated metal — •Gulloo Lal Prajapati¹, Sergey Kovalev¹, Jan-Christoph Deinert¹, Alexey Ponomaryov¹, Atiqa Arshad¹, Gaurav Dubey², and Dhanvir Singh Rana² — ¹Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Department of Physics, Indian Institute of Science Education and Research Bhopal, Bhopal, India

High harmonic generation, a result of intense nonlinear light-matter interaction, has exciting prospects for probing fundamental ultrafast dynamics in matter and it is the basis for attosecond photonics [1, 2]. Here, we present an experimental study on terahertz (THz) third harmonic generation (THG) on a correlated metal, LaNiO3 which exhibits non-Fermi liquid type of metallic state [3]. We observe an intense THG signal, which is usually not expected in metals, upon pumping it by 0.3 THz pulses with peak fields of about 100 kV/cm. Decreasing temperature or increasing fluence increases the intensity of this THG signal. We speculate the origin of such THG emission could be due to the anharmonic nature of LaNiO3 conduction band caused by electronic correlation or directional nature of Ni-3d orbitals. Further investigations are under way to pinpoint the exact mechanism of the observed THG. Our study paves the way for THz THG emission from strongly correlated systems, and enables tracking of their properties on ultrafast timescales. References: 1. Nature Photon 12, 266, 270 (2018). 2. Nature 561, 507, 511 (2018). 3. Annu. Rev. Mater. Res. 46, 305-34 (2016).