2021/08/02 by Shun Okumura, Takahiro Morimoto, Yasuyuki Kato +1
Engineering · Materials Science · Physics and Astronomy · #Condensed matter physics #Conical surface #High harmonic generation #Magnet #Magnetic field #Magnetic moment #Magnetic properties of thin films #Magneto-Optical Properties and Applications #Materials science #Metamaterials and Metasurfaces Applications #Physics #Quantum mechanics #Second-harmonic generation #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.104.l180407
7 pages, 5 figures
arxiv created 2021/08/02 · openalex publication_date 2021/11/18 · arxiv updated 2021/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Chiral magnets, which break both spatial inversion and time reversal symmetries, carry a potential for quadratic optical responses. Despite the possibility of enhanced and controlled responses through the magnetic degree of freedom, the systematic understanding remains yet to be developed. We here study nonlinear optical responses in a prototypical chiral magnetic state with a one-dimensional conical order by using the second-order response theory. We show that the photovoltaic effect and the second harmonic generation are induced by asymmetric modulation of the electronic band structure under the conical magnetic order, and the coefficients, including the sign, change drastically depending on the frequency of incident lights, the external magnetic field, and the strength of spin-charge coupling. We find that both effects can be enormously large compared to those in the conventional nonmagnetic materials. Our results would pave the way for next-generation optical electronic devices, such as unconventional solar cells and optical sensors, based on chiral magnets.