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
- Authors: Zi-Yuan Li, Qi Li, and Zhou Li
- 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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