Impurity-induced states on the surface of three-dimensional topological insulators
Open accessAbstract
We calculate the modification of the local electronic structure caused by a single local impurity on the surface of a three-dimensional topological insulator. We find that the local density of states around the Dirac point of the electronic spectrum at the surface is significantly disrupted near the impurity by the creation of low-energy resonance state(s)---however, this is not sufficient to (locally) destroy the Dirac point. We also calculate the nontrivial spin textures created near the magnetic impurities and discover anisotropic Ruderman-Kittel-Kasuya-Yosida (RKKY) coupling between them.
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In topological insulators, surface-state electrons are confined to two-dimensional Dirac cones, and interactions between deposited impurities are suggested to be mediated over many nanometres.
“In topological insulators, surface-state electrons are naturally confined to the surface in two-dimensional Dirac cones, and it is suggested that interactions between deposited impurities can be mediated over many nanometres (see the illustration in Fig. 4c; refs 11,26).”
From A topological insulator surface under strong Coulomb, magnetic and disorder perturbations (2011) · cites this paper as [11]
Because magnetic-field perturbations from the submonolayer iron coating are weak, the magnetic-phase term in perturbative Hamiltonians can be discounted, and the dominant magnetic effects are expected to be described by a local Heisenberg-exchange term representing direct wavefunction overlap between surface electrons and spin-polarized Fe 3d orbitals.
“Because magnetic-field perturbations from the submonolayer iron coating are quite weak, the magnetic-phase term in perturbative Hamiltonians can be discounted, and the dominant magnetic effects are expected to be described by a local Heisenberg-exchange term representing direct wavefunction overlap (hopping) between surface electrons and spin-polarized Fe 3d orbitals 11 .”
From A topological insulator surface under strong Coulomb, magnetic and disorder perturbations (2011) · cites this paper as [11]
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Cites
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- Authors
- Biswas, R. R., & Balatsky, A. V.
- Affiliations
- Los Alamos National Laboratory (US)
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2010-06-24
- Volume
- 81
- Issue
- 23
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2107628659
- Cited by
- 230
- References
- 6
- Citations by year
- 2026: 7 · 2025: 3 · 2024: 6 · 2023: 6 · 2022: 8 · 2021: 11 · 2020: 16 · 2019: 15 · 2018: 15 · 2017: 19 · 2016: 20 · 2015: 17 · 2014: 22 · 2013: 18 · 2012: 25
- FWCI
- 11.15
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Physical Review B (publishedVersion)
- arXiv (Cornell University) (publishedVersion)
- arXiv (Cornell University)
- Bulletin of the American Physical Society
- Topics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Topological Materials and Phenomena
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Advanced Condensed Matter Physics
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Magnetic properties of thin films
- Keywords
- topological insulators, surface states, local density of states, Dirac point, resonant states, spin textures, magnetic impurities, RKKY interaction, three-dimensional topological insulators
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