Origin of nonlinear photocurrents in chiral multifold semimetal CoSi unveiled by terahertz emission spectroscopy
Year: 2024
Type: article
Abstract: Nonlinear photocurrents in topological semimetals encode quantum geometric characters of Bloch wavefunctions and band topology, and offer a new opportunity for advanced photovoltaics. Here, the authors characterize the nonlinear photoconductivities of chiral multifold semimetal CoSi through a refined terahertz emission spectroscopy analysis. The results reveal a large linear shift conductivity and confirm a giant nonquantized circular injection conductivity in the mid-infrared range. Bulk transverse injection currents and relatively weak photon drag effect are also identified.
Authors: Yao-Jui Chan, Syed Mohammed Faizanuddin, Raju Kalaivanan, Sankar Raman, Hsin Lin, Uddipta Kar, Akhilesh Kr. Singh, Wei-Li Lee, Ranganayakulu K. Vankayala, Min-Nan Ou, Yu-Chieh Wen
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G195151536, Novel Quantum Materials Development and Crystal Growth Core Facility( III ), G3305373037, Exotic Quantum Phases of Frustrated Novel Kagome and Hyper- Kagome Quantum Magnets and Tunable Topological Dirac Surface States and Van Hove Singularities in Kagome Lattice., G5424177470, G580821469, Terahertz – Optical Nonlinear Responses of Quantum Materials( I )
OpenAlex ID: W4404745800