High-order harmonic generations in tilted Weyl semimetals

• URL: http://arxiv.org/abs/2205.06616v1
• Date: Wed, 11 May 2022 12:09:53 GMT
• Title: High-order harmonic generations in tilted Weyl semimetals
• Abstract summary: Strong noncentrosymmetrical generations in high orders are observed around a single type-II Weyl point, especially at frequency zero. In consideration of dynamical symmetries, type-I and -II Weyl cones also show different selective responses under the circularly polarized light. Using a more realistic model containing two pairs of Weyl points, we demonstrate the paired Weyl points with opposite chirality could suppress the overall even-order generations.
• Score: 11.628719393775771
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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 more 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 could suppress the overall even-order generations.

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