Non-Hermitian Weyl semimetal and its Floquet engineering
- URL: http://arxiv.org/abs/2112.14470v2
- Date: Wed, 30 Mar 2022 18:04:29 GMT
- Title: Non-Hermitian Weyl semimetal and its Floquet engineering
- Authors: Hong Wu, Jun-Hong An
- Abstract summary: It is generally believed that non-Hermiticity can transform Weyl semimetals into Weyl-exceptional-ring semimetals.
We investigate the non-Hermitian Weyl semimental and its Floquet engineering in a system with skin effect.
- Score: 0.571097144710995
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: It is generally believed that non-Hermiticity can transform Weyl semimetals
into Weyl-exceptional-ring semimetals. However, this belief is from the systems
without skin effect. We investigate the non-Hermitian Weyl semimental and its
Floquet engineering in a system with skin effect, which breaks the
bulk-boundary correspondence in its Hermitian counterpart. It is found in both
the static and periodically driven cases that the skin effect makes this
general belief no longer valid. We discover that exotic non-Hermitian
topological matters, e.g., a composite phase of Weyl semimetal and topological
insulator with the coexisting Fermi arc and chiral boundary states, a widely
tunable Hall conductivity with multiple quantized plateaus, and a Weyl
semimetal with anomalous Fermi arcs formed by the crossing of gapped bound
state, can be generated by the Floquet engineering. Revealing the leading role
of the skin effect in determining the feature of a semimental, our result
supplies a useful way to artificially synthesize exotic non-Hermitian Weyl
semimetals by periodic driving.
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