However, the bandgaps are so small that topological edge states can only be found below 10 K. 4 HgTe/CdTe 5 and InAs/GaSb 6 heterostructures have been experimentally proven to be 2D topological insulators. 3 2D topological insulators are particularly fascinating due to their linear dispersion of the energy band near the Fermi level, leading to high Fermi velocity and mobility. 1,2 The edge states of topological insulators are protected by time-reversal symmetry which safeguards them from back scattering in the presence of impurity. Introduction Topological insulators are new states of matter having a bulk bandgap like ordinary insulators and unique protected edge states which allow dissipationless transport. Our findings suggest that these derivatives are promising materials for spintronic and future high performance nanoelectronic devices. Lastly, the structural and electronic stability of the topological materials against strain are demonstrated to extend the scope of using these materials. The existence of edge states and topological nontrivial property are illustrated by investigating PbCX 3 nanoribbons with zigzag edges.
The topological invariants of the samples are calculated to confirm their topologically nontrivial properties. In this work, we investigate the performance of a plumbene monolayer with –CX 3 (X = H, F, Cl) chemical decoration and report very large bandgaps in the range of 0.8414 eV to 0.9818 eV with spin–orbit coupling, which is much higher compared to most other topological insulators and realizable at room temperature. However, finding suitable chemical groups for such decoration has always been a demanding task. This is because their high spin–orbit coupling (SOC) and large bandgap opening may be possible by chemically decorating these group IV graphene analogues.
are promising materials for QSH insulators. Group IV analogues of graphene such as silicene, germanene, stanene, plumbene etc. In this regard, one of the key challenges is to find suitable QSH insulators with large bandgaps. Topologically protected edge states of 2D quantum spin Hall (QSH) insulators have paved the way for dissipationless transport.
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