Abstract
Motivated by the emergent fermions in the chiral topological semimetal RhSi, which has bulk higher-spin chiral fermions with a topological charge of , respectively, we studied the shift vector induced nonlinear optical conductivity of bulk RhSi by first-principles calculation. Our calculation demonstrates that the maximal is about under an optical field with a photon energy of meV. With a photon energy large than 450 meV, is relatively small. Especially, the calculated is almost vanishing within a photon energy range of 450–500 meV. Below 300 meV, our calculation also reveals that the dielectric function and reflectivity decreases with an increase of photon energy, while the absorption coefficient increases with an increase of photon energy. Therefore, RhSi has a potential application for optoelectronic detection in the terahertz range.
- Received 25 July 2019
- Revised 18 September 2019
DOI:https://doi.org/10.1103/PhysRevB.100.155201
©2019 American Physical Society