Second Harmonic Helicity and Faraday Rotation in Gated Single-Layer 1T$'$-WTe$_2$

Bhalla, Pankaj; Rostami, Habib

doi:10.48550/arxiv.2201.00734

Cited by 1 publication

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References 74 publications

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“…[54][55][56][57] The strong photovoltaic process is predicted with the combination of inversion symmetry breaking and tilts of the Weyl cone. [58] Up to now, giant nonlinear optical responses are found in both types of WSMs with broken inversion symmetry, such as the second-harmonic generations in TaAs, WTe 2 , [59][60][61] photocurrent from the circular photogalvanic effect in type-II WSMs, [62][63][64] and high harmonics from WSM WP 2 . [65] Our work focuses on the influence of tilted structures to the high-order harmonics in Weyl semimetal.…”

Section: Introductionmentioning

confidence: 99%

High-order harmonic generations in tilted Weyl semimetals

Li¹,

Li²,

Li³

2022

Chinese Phys. B

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We investigate high-order harmonic generations (HHGs) under the comparison of Weyl cones in two types. Due to the hyperboloidal electron pocket structure, strong noncentrosymmetrical generations in high orders are observed around a single type-II Weyl point, especially at frequency zero. Such remarkable DC signal is proved to have attributions from the intraband transition after spectral decomposition. Under weak pulse electric field, the linear optical response of a non-tilted Weyl cone is consistent with the Kubo theory. With extensive numerical simulations, we conclude the non-zero chemical potential can enhance the even-order generations, from the slightly tilted system to the over-tilted systems. In consideration of dynamical symmetries, type-I and -II Weyl cones also show different selective responses under the circularly polarized light. Finally, using a more realistic model containing two pairs of Weyl points, we demonstrate the paired Weyl points with opposite chirality can suppress the overall even-order generations.

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