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9 Hybridized Bonding
9.5.2 Monolayer High-T C and Topological Edge
Superconductivity
The spin-resolved polarization by processes of atomic undercoordination and sp
3 -
orbital hybridization may contribute to the high-T C superconductors (HTSCs) and
topological insulators (TIs) edge conductivity. Most HTSCs prefer the layered structure and the van der Waals gaps between layers serve as channels of charge transport.
Dirac-Fermions associated with the even less coordinated edge atoms serve as the
carriers transporting along the edges of the topological insulators. Figure 9.13 comFig. 9.13 Comparison of the angular and temperature resolved conductivity (Fermi pocket) for a the
FeTe 0.55 Se 0.45 (T C = 12 K) topological insulator [77] and b the (Ba 0.6 K 0.4 )Fe 2 As 2 superconductor
(T C = 38.5 K) [78]. The respective characteristic coherent peak energy at 2 and 20 meV is correated
to the T C value. Reprinted with permission from [77, 78]
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