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- W2733754328 abstract "Topological nodal line semimetals are characterized by the crossing of the conduction and valence bands along one or more closed loops in the Brillouin zone. Usually, these loops are either isolated or touch each other at some highly symmetric points. Here, we introduce a different kind of nodal line semimetal, that contains a pair of linked nodal loops. A concrete two-band model was constructed, which supports a pair of nodal lines with a double-helix structure, which can be further twisted into a Hopf link because of the periodicity of the Brillouin zone. The nodal lines are stabilized by the combined spatial inversion $mathcal{P}$ and time reversal $mathcal{T}$ symmetry; the individual $mathcal{P}$ and $mathcal{T}$ symmetries must be broken. The band exhibits nontrivial topology that each nodal loop carries a $ensuremath{pi}$ Berry flux. Surface flatbands emerge at the open boundary and are exactly encircled by the projection of the nodal lines on the surface Brillouin zone. The experimental implementation of our model using cold atoms in optical lattices is discussed." @default.
- W2733754328 created "2017-07-14" @default.
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- W2733754328 date "2017-07-05" @default.
- W2733754328 modified "2023-10-14" @default.
- W2733754328 title "Topological semimetals with a double-helix nodal link" @default.
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- W2733754328 doi "https://doi.org/10.1103/physrevb.96.041102" @default.
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