• Felser, Claudia
• Markou, Anastasios
• Lange, Gunnar F.
• Ciccarelli, Chiara
• Kholid, Fn
• Hamara, Dominik
• Slager, Robert-Jan

Abstract

Mn3Sn is a material that has attracted a lot of attention lately for its topologically non-trivial band structure, which leads to very promising spintronic properties. In this work we experimentally demonstrate that an epitaxially grown thin film of Mn3Sn acts as a source of THz radiation at room temperature when irradiated by a femtosecond laser pulse. By combining various experimental measurements as a function of pump polarisation, magnetic field, and sample orientation we are able to explain the origin of the THz emission with the photocurrents generated via the photon drag effect. A thorough symmetry analysis combined with electronic band structure calculations using density-functional theory (DFT) are used to support our conclusions and provide a guide towards the important features that lead to photocurrent generation, which is useful for designing ultra-fast current pulses emitters.

Topics

• density
• impedance spectroscopy
• theory
• thin film
• density functional theory
• band structure