The generation of a nonlinear high-frequency response in solids from powerful optical pumps has gained momentum over the past decade. High-harmonic generation (HHG) in solids can be obtained from strong-field laser excitation, usually restricted to optical frequencies and limited both in amplitude and in harmonic order. Here, we demonstrate that high-harmonic emission can be achieved by exploiting conventional spin pumping, without the need for optical excitation. Considering a noncentrosymmetric (ferro- or antiferro-)magnet excited at a frequency ω, we demonstrate the emergence of HHG in two main regimes: (i) In the perturbative regime, where a weak spin-orbit interaction is considered, the carrier pumping features a number of harmonics with a cutoff order nmax
|Original language||English (US)|
|Journal||Physical Review B|
|State||Published - May 31 2022|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-02
Acknowledgements: The authors acknowledge useful discussions with X. Waintal and B. Nikolic, as well as computing resources on the supercomputer SHAHEEN granted by the KAUST Supercomputing Laboratory. O.L. thanks A. Abbout for useful discussions. This work was supported by King Abdullah University of Science and Technology (KAUST).