2025-06-06 早稲田大学
＜関連情報＞
- https://www.waseda.jp/inst/research/news/81004
- https://journals.aps.org/prresearch/abstract/10.1103/PhysRevResearch.7.023218
キラルフェルミオンによる光電流と高調波発生の理論 Theory of photocurrent and high-harmonic generation with chiral fermions
Yuya Ominato and Masahito Mochizuki
Physical Review Research Published: 2 June, 2025
DOI: https://doi.org/10.1103/PhysRevResearch.7.023218
Abstract
We theoretically discover possible dc-current induction and high-harmonic generation from photodriven chiral fermions in B20-type semimetals irradiated with circularly polarized light as nonlinear optical responses with several unconventional properties. First, we find multiple sign changes of the induced bulk dc photocurrent as a function of light parameters, which is ascribed to the nature of asymmetric photon-dressed bands in chiral systems. Moreover, we observe a parity-dependent directivity of high-harmonic generation where the odd- and even-order harmonics have intensities only in directions perpendicular and parallel to the polarization plane, respectively, which can be understood from dynamical symmetry of the present photodriven chiral systems.
