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Orbital Pseudospin-Momentum Locking in Two-Dimensional Chiral Borophene
F Crasto de Lima1, G J Ferreira1, R H Miwa1
1Instituto de Física , Universidade Federal de Uberlândia , C.P. 593, 38400-902 , Uberlândia , MG Brazil.
Nano Letters
|August 20, 2019
Summary
We predict novel orbital textures in borophene chiral monolayers, analogous to topological insulator spin-textures. An electric field can switch these orbital textures on and off in specific layer stackings.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Quantum Chemistry
Background:
- Orbital textures observed in Rashba and topological insulator (TI) surface states due to spin-orbit coupling (SOC).
- Borophene, a 2D material, offers unique electronic properties.
Purpose of the Study:
- To predict and characterize novel p/p orbital textures in linear dispersive Dirac bands at the K/K' points of χ-h0 borophene chiral monolayer.
- To investigate the control of orbital textures and layer localization via stacking and electric fields.
Main Methods:
- First-principles calculations.
- Effective Hamiltonian modeling.
- Analysis of spin-orbit coupling effects.
Main Results:
- Prediction of a unique p/p orbital texture in borophene chiral monolayers.
- Demonstration of momentum-locked orbital pseudospin, similar to TI spin-textures.
- Control over orbital textures and layer localization by designing layer stacking (equivalent/opposite chiralities) and applying external electric fields.
Conclusions:
- Borophene chiral monolayers exhibit tunable orbital textures.
- Electric fields can act as an on/off switch for orbital-textured Dirac cones in specific multilayer configurations.
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