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• W4283837205 abstract "Linking structure is a new concept characterizing topological semimetals, which indicates the interweaving of gap-closing nodes at the Fermi energy ($E_F$) with other nodes below $E_F$. As the number of linked nodes can be changed only via pair-creation or pair-annihilation, a linked node is more stable and robust than ordinary nodes without linking. Here we propose a new type of a linked nodal structure between a nodal line (nodal surface) at $E_F$ with another nodal line (nodal surface) below $E_F$ in two-dimensional (three-dimensional) spinless fermion systems with $mathcal{IT}$ symmetry where $mathcal{I}$ and $mathcal{T}$ indicate inversion and time-reversal symmetries, respectively. Because of additional chiral and rotational symmetries, in our system, a double band inversion creates a pair of linked nodes carrying the same topological charges, thus the pair are unremovable via a Lifshiftz transition, which is clearly distinct from the cases of the linked nodes reported previously. A realistic tight binding model and effective theory are developed for such a linking structure. Also, using density functional theory calculations, we propose a class of materials, composed of stacked bilayer graphene with Kekul'{e} texture, as a candidate system hosting the new type of the linked nodal structure." @default.
• W4283837205 created "2022-07-07" @default.
• W4283837205 creator A5006331492 @default.
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• W4283837205 date "2022-09-30" @default.
• W4283837205 modified "2023-10-16" @default.
• W4283837205 title "Unremovable linked nodal structures protected by crystalline symmetries in stacked bilayer graphene with Kekulé texture" @default.
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• W4283837205 doi "https://doi.org/10.1103/physrevb.106.l121118" @default.
• W4283837205 hasPublicationYear "2022" @default.
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