Journal
PHYSICAL REVIEW B
Volume 103, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.035126
Keywords
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Funding
- PIP 112-201501-00506 of CONICET [PICT 2017-2726, PICT 2018-01546]
- Agencia Nacional de Promocion Cientifica y Tecnologica (ANPCyT), Argentina
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First-principles calculations were used to analyze the behavior of stanene in different phases as it undergoes a topological phase transition under the influence of an external electric field. It was found that the system is in a topological phase when the critical field is approximately 0.69 eV/angstrom for the more realistic MLWF, suggesting greater stability on inert substrates compared to a multiorbital tight-binding model.
Starting from first-principles calculations on pristine stanene and using maximally localized Wannier functions (MLWFs), we analyze the different phases of the system when it is driven to a topological phase transition. The transition is achieved by a continuous parameter represented by an external electric field epsilon(z) as a generic inversion-symmetry-breaking term. We also compare the results with those of a multiorbital tight-binding (TB) model for stanene, whose hopping integrals are determined by Slater-Koster parameters. The system is in a topological (trivial) phase for epsilon(z) < epsilon(c) (epsilon(z) > epsilon(c)). We obtain that the critical field is epsilon(c) similar or equal to 0.69 eV/angstrom for the more realistic MLWF compared to epsilon(c) similar or equal to 0.15 eV/angstrom in the TB model. This suggests a larger stability of the topological phase of stanene when deposited on inert substrates.
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