Tuesday, June 25, 2024
HomeNanotechnologyPentagonal nanowires from topological crystalline insulators: a platform for intrinsic core-shell nanowires...

Pentagonal nanowires from topological crystalline insulators: a platform for intrinsic core-shell nanowires and higher-order topology


We report on the experimental realization of Pb1-xSnxTe pentagonal nanowires (NWs) with [110] orientation utilizing molecular beam epitaxy strategies. Utilizing first-principles calculations, we examine the structural stability in NWs of SnTe and PbTe in three completely different structural phases: cubic, pentagonal with [001] orientation and pentagonal with [110] orientation. Inside a semiclassical strategy, we present that the interaction between ionic and covalent bonds favors the formation of pentagonal NWs. Moreover, we discover that this pentagonal construction is extra more likely to happen in tellurides than in selenides. The disclination and twin boundary trigger the digital states originating from the NW core area to generate a conducting band connecting the valence and conduction bands, making a symmetry-enforced metallic section. The metallic core band has reverse slopes within the circumstances of Sn and Te twin boundary, whereas the bands from the shell are insulating. We lastly research the digital and topological properties of pentagonal NWs unveiling their potential as a brand new platform for higher-order topology and fractional cost. These pentagonal NWs characterize a novel case of intrinsic core-shell one-dimensional nanostructures with distinct structural, digital and topological properties between the core and the shell area.

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