NDLI: Nanostructured topological state in bismuth nanotube arrays: inverting bonding-antibonding levels of molecular orbitals.

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Nanostructured topological state in bismuth nanotube arrays: inverting bonding-antibonding levels of molecular orbitals.

Content Provider	Semantic Scholar
Author	Jin, Kyung-Hwan Jhi, Seung-Hoon Liu, Feng
Copyright Year	2017
Abstract	We demonstrate a new class of nanostructured topological materials that exhibit a topological quantum phase arising from nanoscale structural motifs. Based on first-principles calculations, we show that an array of bismuth nanotubes (Bi-NTs), a superlattice of Bi-NTs with periodicity in the order of tube diameter, behaves as a nanostructured two-dimensional (2D) quantum spin Hall (QSH) insulator, as confirmed from the calculated band topology and 1D helical edge states. The underpinning mechanism of the QSH phase in the Bi-NT array is revealed to be inversion of bonding-antibonding levels of molecular orbitals of constituent nanostructural elements in place of atomic-orbital band inversion in conventional QSH insulators. The quantized edge conductance of the QSH phase in a Bi-NT array can be more easily isolated from bulk contributions and their properties can be highly tuned by tube size, representing distinctive advantages of nanostructured topological phases. Our finding opens a new avenue for topological materials by extending topological phases into nanomaterials with molecular-orbital-band inversion.
Starting Page	16638
Ending Page	16644
Page Count	7
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.eng.utah.edu/~fliu/pdfs/c7nr05325h.pdf
PubMed reference number	29087421v1
Alternate Webpage(s)	https://doi.org/10.1039/c7nr05325h
DOI	10.1039/c7nr05325h
Journal	Nanoscale
Volume Number	9
Issue Number	43
Language	English
Access Restriction	Open
Subject Keyword	Anatomy, Regional Bismuth Diameter (qualifier value) Nanostructured Materials Nanotubes Pyschological Bonding
Content Type	Text
Resource Type	Article

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