Helicity-dependent Ultrafast Photocurrents in Weyl Magnet Mn3Sn
Abstract
We present an optical pump-THz emission study on non-collinear antiferromagnet Mn3Sn. We show that Mn3Sn 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.
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