'Trimming' the edge-states of a topological insulator yields a new class of material featuring unconventional 'two-way' edge transport, as reported in a new theoretical study from Monash University, Australia, published in Materials Today Physics.
, a topological crystalline insulator forms a promising addition to the family of topological materials and significantly broadens the scope of materials with topologically nontrivial properties.
Modifying this phrase is not a simple task. The topological material is akin to a large tree rooted in the solid soil of"bulk-edge correspondence," meaning that the intrinsic properties of the bulk will dictate the nature of the edge current. The discovery of TCI significantly broadens the scope of materials with topologically nontrivial properties. Its distinctive reliance on symmetry also paves the way for novel techniques to manipulate edge transport, offering potential applications in transistor devices.
"While the common belief is that TCI exhibits the same edge transport mode observed in topological insulators, where each stream of spin current strictly travels in one direction, our findings reveal that TCI planar bismuthene hosts a new type of spin transport protected by mirror symmetry," explains lead author Dr. Yuefeng Yin, a research fellow at Monash.
The research team anticipates that this computational breakthrough will inspire further follow-up studies, both experimental and theoretical, to fully harness the potential of this novel edge transport in electronic and spintronic applications.Following the discovery of an unconventional spin texture in 2D TCI planar bismuthene, the research team's objective is to extract the exotic spin currents from the entangled edge bands by utilizing bulk-edge interactions.
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