Tuning of spin-anisotropy in non-magnetic heterostructures of a topological semimetal and band insulators.
We report a detailed all-electron-full potential abintio study of two superlattice heterostructures, one component of which is a unit cell of CuPt ordered InAs0:5Sb0:5. The alloy part of the heterostructures is a topological semimetal with very high spin-orbit coupling. The other component of the two systems are band insulators, wurtzite-InAs(001) and zincblende-InSb(111) respectively. Our theoretical analysis predicts that a variation in the constituents of these nonmagnetic hetrostructures can render different spin-orbit coupling directions energetically favorable. We show that the spin-orbit coupling direction, band gap as well as the mobility of the carriers can be tuned in these systems by the choice of the band insulator component. The study holds promise for devising nonmagnetic heterostructures, where their intrinsic spin-orbit anisotropy can change the band gap by around ~30 meV.
Publisher URL: http://arxiv.org/abs/1801.03392
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