Origin of nonlinear photocurrents in chiral multifold semimetal CoSi unveiled by terahertz emission spectroscopy
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
- Raman Sankar (ORCID: https://orcid.org/0000-0003-4702-2517)
- Akhilesh Kr. Singh (ORCID: https://orcid.org/0000-0001-9152-4966)
- V.K. Ranganayakulu
- Min‐Nan Ou (ORCID: https://orcid.org/0000-0002-3525-3011)
- Yu‐Chieh Wen (ORCID: https://orcid.org/0000-0001-7124-2355)
- Uddipta Kar
- Wei‐Li Lee (ORCID: https://orcid.org/0000-0001-7207-1607)
- Yao-Jui Chan (ORCID: https://orcid.org/0000-0003-1761-591X)
- Syed Mohammed Faizanuddin
- Hsin Lin
- R. Kalaivanan
Institutions
- National Tsing Hua University (TW)
- Institute of Physics, Academia Sinica (TW)
- Academia Sinica (TW)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2024-11-26
- DOI
- https://doi.org/10.1103/physrevb.110.l201118
- Citations
- 1
- Primary Topic
- Terahertz technology and applications
- Type
- article
- Field-Weighted Citation Impact
- 0.21
Funders
- Academia Sinica