Ultrafast helicity-dependent photocurrents in Weyl Magnet Mn3Sn

Published version
Repository DOI

Change log
Hamara, Dominik 
Lange, Gunnar F 
Kholid, Farhan Nur 
Felser, Claudia 

jats:titleAbstract</jats:title>jats:pMnjats:sub3</jats:sub>Sn 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 Mnjats:sub3</jats:sub>Sn 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.</jats:p>


Acknowledgements: C.C. and D.H. acknowledge support from the Royal Society. G.F.L. is funded by the Aker Scholarship. R.J.S. acknowledges funding from a New Investigator Award, EPSRC grant EP/W00187X/1, as well as Trinity college, Cambridge. G.F.L. thanks B. Peng, S. Chen, U. Haeusler and M.A.S. Martínez for useful discussions.

Journal Title
Communications Physics
Conference Name
Journal ISSN
Volume Title
Springer Science and Business Media LLC
RCUK | Engineering and Physical Sciences Research Council (EPSRC) (EP/W00187X/1)