Experimental evidence of a new class of massless fermions

The discovery of graphene with its massless fermions established a new branch of nanomaterials in which linear bands can be realized. It has been predicted that beside Dirac fermions revealing isotropic character and observed in a number of two-dimensional materials, another class of massless fermio...

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Bibliographic Details
Published in:Nanoscale horizons 2020-04, Vol.5 (4), p.679-682
Main Authors: Kopciuszy ski, Marek, Krawiec, Mariusz, urawek, Lucyna, Zdyb, Ryszard
Format: Article
Language:English
Subjects:
Cones
Electronic structure
Fermions
Graphene
Nanomaterials
Surface layers
Two dimensional materials
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Summary:The discovery of graphene with its massless fermions established a new branch of nanomaterials in which linear bands can be realized. It has been predicted that beside Dirac fermions revealing isotropic character and observed in a number of two-dimensional materials, another class of massless fermions can also be found: strongly anisotropic fortune teller-like states which form planes instead of cones in the electronic structure. Here, we demonstrate that such distinct electronic structures exist and can be found in a surface layer of silicon. Massless fermions forming fortune teller states in a surface layer of Si(110).
ISSN:2055-6756
2055-6764
2055-6764
DOI:10.1039/c9nh00681h