Abstract：
:We analyze the symmetry and topological features of a family of materials closely related to penta-graphene, derived from it by adsorption or substitution of different atoms. Our description is based on a novel approach, called topological quantum chemistry, that allows to characterize the topology of the electronic bands, based on the mapping between real and reciprocal space. In particular, by adsorption of alkaline (Li or Na) atoms we obtain a nodal line metal at room temperature, with a continuum of Dirac points around the perimeter of the Brillouin zone. This behavior is also observed in some substitutional derivatives of penta-graphene, such as penta-PC2. Breaking of time-reversal symmetry can be achieved by the use of magnetic atoms; we study penta-MnC2, which also presents spin-orbit coupling and reveals a Chern insulator phase. We find that for this family of materials, symmetry is the source of protection for metallic and nontrivial topological phases that can be associated to the presence of fractional band filling, spin-orbit coupling and time-reversal symmetry breaking.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Bravo S,Correa J,Chico L,Pacheco Mdoi
10.1038/s41598-019-49187-wsubject
Has Abstractpub_date
2019-09-04 00:00:00pages
12754issue
1issn
2045-2322pii
10.1038/s41598-019-49187-wjournal_volume
9pub_type
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