Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi2Te4

doi:10.1088/1674-1056/ad2bfb

Abstract A Weyl node is characterized by its chirality and tilt. We develop a theory of how nth-order nonlinear optical conductivity behaves under transformations of anisotropic tensor and tilt, which clarifies how chirality-dependent and -independent parts of optical conductivity transform under the reversal of tilt and chirality. Built on this theory, we propose ferromagnetic m MnBi₂Te₄ as a magnetoelectrically regulated, terahertz optical device, by magnetoelectrically switching the chirality-dependent and -independent DC photocurrents. These results are useful for creating nonlinear optical devices based on the topological Weyl semimetals.

Keywords: nonlinear optical response topological Weyl semimetals chiral anomaly

Received: 12 December 2023
Revised: 17 February 2024
Accepted manuscript online: 22 February 2024

PACS:	73.50.Fq	(High-field and nonlinear effects)
	73.43.Qt	(Magnetoresistance)
	71.55.Ak	(Metals, semimetals, and alloys)
	73.63.-b	(Electronic transport in nanoscale materials and structures)

Fund: Project supported by the National Key R&D Program of China (Grant Nos. 2018YFA, 0305601, and 2021YFA1400100), the National Natural Science Foundation of China (Grant Nos. 12274003, 11725415, and 11934001), and the Innovation Program for Quantum Science and Technology (Grant No. 2021ZD0302600).

Corresponding Authors: Ji Feng
E-mail: jfeng11@pku.edu.cn

Cite this article:

Zhuo-Cheng Lu(卢倬成) and Ji Feng(冯济) Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi₂Te₄ 2024 Chin. Phys. B 33 047303

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Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi2Te4

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Symmetry transformation of nonlinear optical current of tilted Weyl nodes and application to ferromagnetic MnBi₂Te₄