Strain-induced topological phase transition at (111) SrTiO$_3$-based heterostructures
| Autor: | Trama, Mattia, Perroni, Carmine Antonio, Cataudella, Vittorio |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | Phys. Rev. Research 3. (2021) 043038 |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevResearch.3.043038 |
| Popis: | The quasi-two-dimensional electronic gas at the (111) SrTiO$_3$-based heterostructure interfaces is described by a multi-band tight-binding model providing electronic bands in agreement at low energies with photoemission experiments. We analyze both the roles of the spin-orbit coupling and of the trigonal crystal field effects. We point out the presence of a regime with sizable strain where the band structure exhibits a Dirac cone whose features are consistent with \textit{ab-initio} approaches. The combined effect of spin-orbit coupling and trigonal strain gives rise to non-trivial spin and orbital angular momenta patterns in the Brillouin zone and to quantum spin Hall effect by opening a gap at the Dirac cone. The system can switch from a conducting to a topological insulating state \textit{via} modification of trigonal strain within a parameter range which is estimated to be experimentally achievable. Comment: 19 pages, 20 figures |
| Databáze: | arXiv |
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