Work

Large circular photogalvanic effect in the noncentrosymmetric magnetic Weyl semimetal CeAlSi

Year: 2025

Type: article

Abstract: The recent discovery of the Weyl semimetal CeAlSi with simultaneous breaking of inversion and time-reversal symmetries has opened up new avenues for research into the interaction between light and topologically protected bands. In this work, we present a comprehensive examination of the shift current and injection current responsible for the circular photogalvanic effect in CeAlSi using first-principles calculations. Our investigation identifies a significant injection current of 4 $\mathrm{mA}/{\mathrm{V}}^{2}$ over a broad range in the near-infrared region of the electromagnetic spectrum, exceeding previously reported findings. In addition, we explored several externally controllable parameters to further enhance the photocurrent. A substantial boost in the injection current is observed when applying uniaxial strain along the $c$ axis of the crystal: a 5% strain results in a remarkable 64% increment. The exceptional photocurrent response in CeAlSi suggests that magnetic noncentrosymmetric Weyl semimetals may provide promising opportunities for novel photogalvanic applications.

Source: Physical review. B./Physical review. B

DOI: 10.1103/physrevb.111.195105

Authors: Abhirup Roy Karmakar, A. Taraphder, G. P. Das

Institutions: Indian Institute of Technology Kharagpur, TCG Crest

Language: English

Topic: Topological Materials and Phenomena

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Department of Science and Technology, Ministry of Science and Technology, India, Ministry of Education, India, Ministry of Electronics and Information technology, Indian Institute of Technology Kharagpur

OpenAlex ID: W4410032829

FWCI: 1.121

Cites: 85

Cited by: 3

Related to: 10