How massless are Weyl fermions in Weyl semimetals?
- URL: http://arxiv.org/abs/2307.13562v1
- Date: Tue, 25 Jul 2023 15:14:31 GMT
- Title: How massless are Weyl fermions in Weyl semimetals?
- Authors: Amar Bharti, Misha Ivanov and Gopal Dixit
- Abstract summary: Circularly polarized light fails to generate currents in inversion-symmetric Weyl semimetals with degenerate Weyl nodes.
A trefoil field composed of a counterrotating fundamental is proposed to control the induced asymmetry at a chiral node from positive to negative, including zero.
- Score: 0.0
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Circularly polarized light fails to generate currents in inversion-symmetric
Weyl semimetals with degenerate Weyl nodes. While each node generates current
with the direction depending on its chirality, the two currents in the two
degenerate nodes of opposite chirality cancel each other. By extension, it is
also generally expected that the currents generated at the same Weyl node by
the fields of opposite helicity should also observe mirror symmetry and cancel.
Surprisingly, here we find that this is not the case. The origin of this effect
lies in the nonlinear energy dispersion, which manifests strongly already very
close to the Weyl nodes, where linear dispersion is expected to hold and the
Weyl fermions are thus expected to be massless. A scheme based on using a
trefoil field composed of a counterrotating fundamental and its second harmonic
is proposed to control the induced asymmetry at a chiral node from positive to
negative, including zero.
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