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Figure 10
Visualization of the tight-binding modes for the different Bi irreducible representations. The Eu, T2u and T1u (1) mode sets have the largest amplitude. They describe the displacements that generate a toroidal distribution of Bi positions and agree with the predicted displacement modes of Eu and T1u symmetry from ab initio density functional theory calculations (Shoemaker et al., 2010BB38).

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