Helicity-dependent Ultrafast Photocurrents in Weyl Magnet Mn${}_3$Sn

Abstract

We present an optical pump-THz emission study on non-collinear antiferromagnet Mn${}_3$Sn. We show that Mn${}_3$Sn acts as a source of THz radiation when irradiated by femtosecond laser pulses. The polarity and amplitude of the emitted THz fields can be fully controlled by the polarisation of optical excitation. We explain the THz emission with the photocurrents generated via the photon drag effect by combining various experimental measurements as a function of pump polarisation, magnetic field, and sample orientation with thorough symmetry analysis of response tensors.

10+13 pages; 4+5 figures

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Cited by in corpus (3)

• Non-linear Hall Effects: Mechanisms and Materials
• Photocurrent generation in solids via linearly polarized laser
• Circular Photon Drag Effect in Dirac electrons by Quantum Geometry