Orbital Pseudospin-Momentum Locking in Two-Dimensional Chiral Borophene

Recently, orbital-textures have been found in Rashba and topological insulator (TI) surface states as a result of the spin–orbit coupling (SOC). Here, we predict a p x /p y orbital texture, in linear dispersive Dirac bands, arising at the K/K′ points of χ-h 0 borophene chiral monolayer. Combining “f...

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Bibliographic Details
Published in:Nano letters 2019-09, Vol.19 (9), p.6564-6568
Main Authors: Crasto de Lima, F, Ferreira, G. J, Miwa, R. H
Format: Article
Language:English
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Summary:Recently, orbital-textures have been found in Rashba and topological insulator (TI) surface states as a result of the spin–orbit coupling (SOC). Here, we predict a p x /p y orbital texture, in linear dispersive Dirac bands, arising at the K/K′ points of χ-h 0 borophene chiral monolayer. Combining “first-principles” calculations with effective Hamiltonians, we show that the orbital pseudospin has its direction locked with the momentum in a similar way as TIs’ spin-textures. Additionally, considering a layer pseudospin degree of freedom, this lattice allows stackings of layers with equivalent or opposite chiralities. In turn, we show a control of the orbital textures and layer localization through the designed stacking and external electric field. For instance, for the opposite chirality stacking, the electric field allows for an on/off switch of the orbital-textured Dirac cone.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.9b02802