Experimental demonstration of acoustic semimetal with topologically charged nodal surface
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Journal:
Science advances
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Abstract:
Weyl points are zero-dimensional band degeneracy in three-dimensional momentum space that has nonzero topological charges. The presence of the topological charges protects the degeneracy points against perturbations and enables a variety of fascinating phenomena. It is so far unclear whether such charged objects can occur in higher dimensions. Here, we introduce the concept of charged nodal surface, a two-dimensional band degeneracy surface in momentum space that is topologically charged. We provide an effective Hamiltonian for this charged nodal surface and show that such a Hamiltonian can …
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Volume:
6
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Issue:
8
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Page Number:
eaav2360
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Translation or Not:
no
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Date of Publication:
2020-02-01
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Links to published journals:
https://www.science.org/doi/full/10.1126/sciadv.aav2360