Orbital Pseudospin-Momentum Locking in Two-Dimensional Chiral Borophene.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 31424949.
- Also identified by DOI 10.1021/acs.nanolett.9b02802.
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Abstract
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<sub><i>x</i></sub>/p<sub><i>y</i></sub> orbital texture, in linear dispersive Dirac bands, arising at the <i>K</i>/<i>K</i>' points of χ-<i>h</i><sub>0</sub> 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.