# Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance

@article{Miao2018ObservationOA, title={Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance}, author={Lin Miao and Yishuai Xu and Wenhan Zhang and Daniel Older and S. Alexander Breitweiser and Erica C. Kotta and Haowei He and Takehito Suzuki and Jonathan D. Denlinger and Rudro R. Biswas and Joseph G. Checkelsky and Weida Wu and L. Andrew Wray}, journal={npj Quantum Materials}, year={2018}, volume={3}, pages={1-7} }

The massless Dirac electrons found at topological insulator surfaces are thought to be influenced very little by weak, non-magnetic disorder. However, a resonance effect of strongly perturbing non-magnetic impurities has been theoretically predicted to change the dispersion and physical nature of low-energy quasiparticles, resulting in unique particle-like states that lack microscopic translational symmetry. Here we report the direct observation of impurities reshaping the surface Dirac cone of…

## 14 Citations

Gap-like feature observed in the non-magnetic topological insulators.

- Physics, MedicineJournal of physics. Condensed matter : an Institute of Physics journal
- 2019

Non-magnetic gap at the Dirac point of topological insulators remains an open question in the field. Here, we present angle-resolved photoemission spectroscopy experiments performed on Cr-doped…

Many-impurity scattering on the surface of a topological insulator

- Medicine, PhysicsScientific reports
- 2021

This work finds that the SCBA overestimates the impact of the random distribution of impurities on the spectral properties of surface states compared to the CPA predictions, and the difference is more pronounced when increasing the magnitude of the disorder.

Spectromicroscopic measurement of surface and bulk band structure interplay in a disordered topological insulator

- Physics, Materials Science
- 2019

Topological insulators are bulk semiconductors that manifest in-gap surface states with massless Dirac-like dispersion due to the topological bulk-boundary correspondence principle 1 – 3 . These…

Electron scattering in a superlattice of line defects on the surface of topological insulators.

- Materials Science, PhysicsJournal of physics. Condensed matter : an Institute of Physics journal
- 2020

The findings suggest that the potential ripples on the surface of topological insulators can be utilized to control the local electronic properties of these materials.

Moving Dirac nodes by chemical substitution

- MedicineProceedings of the National Academy of Sciences
- 2021

It is shown that Dirac states can be effectively tuned by doping a transition metal sulfide, [Formula: see text], through Co/Ni substitution, a model system to functionalize Dirac materials by varying the strength of electron correlations.

Emergent flat band electronic structure in a VSe2/Bi2Se3 heterostructure

- Communications Materials
- 2021

Flat band electronic states are proposed to be a fundamental tool to achieve various quantum states of matter at higher temperatures due to the enhanced electronic correlations. However, materials…

Connection topology of step edge state bands at the surface of a three dimensional topological insulator

- Physics, Materials ScienceNew Journal of Physics
- 2018

Topological insulators in the Bi$_2$Se$_3$ family manifest helical Dirac surface states that span the topologically ordered bulk band gap. Recent scanning tunneling microscopy measurements have…

Impurity potential induced gap at the Dirac point of topological insulators with in-plane magnetization

- PhysicsPhysical Review B
- 2019

The quantum anomalous Hall effect (QAHE), characterized by dissipationless quantized edge transport, relies crucially on a nontrivial topology of the electronic bulk band structure and a robust fer…

Mapping out the emergence of topological features in the highly alloyed topological Kondo insulators
Sm1−xMxB6(M=Eu,Ce)

- PhysicsPhysical Review B
- 2021

Yishuai Xu, Erica C. Kotta, M. S. Song, B. Y. Kang, J. W. Lee, B. K. Cho, Shouzheng Liu, Turgut Yilmaz, Elio Vescovo, Jonathan D. Denlinger, Lin Miao, and L. Andrew Wray ∗ Department of Physics, New…

Non-linear hybrid surface-defect states in defective Bi$_2$Se$_3$

- Physics
- 2022

Surface-states of topological insulators are assumed to be robust against nonmagnetic defects in the crystal. However, recent theoretical models and experiments indicate that even non-magnetic…

## References

SHOWING 1-10 OF 50 REFERENCES

A topological insulator surface under strong Coulomb, magnetic and disorder perturbations

- Physics
- 2011

Topological insulators embody a state of bulk matter characterized by spin-momentum-locked surface states that span the bulk bandgap. This highly unusual surface spin environment provides a rich…

Topological surface states protected from backscattering by chiral spin texture

- Chemistry, MedicineNature
- 2009

It is demonstrated that the chiral nature of these states protects the spin of the carriers, potentially useful for spin-based electronics, in which long spin coherence is critical, and also for quantum computing applications, where topological protection can enable fault-tolerant information processing.

Disorder enabled band structure engineering of a topological insulator surface

- Materials Science, PhysicsNature communications
- 2017

At native densities in the model Bi2X3 (X=Bi, Te) compounds, defect resonance states are predicted to generate a new quantum basis for an emergent electron gas that supports diffusive electrical transport.

Photoemission spectroscopy of magnetic and nonmagnetic impurities on the surface of the Bi2Se3 topological insulator.

- Materials Science, MedicinePhysical review letters
- 2012

A remarkable insensitivity of the topological surface state to both nonmagnetic and magnetic impurities in the low impurity concentration regime is revealed.

Experimental Realization of a Three-Dimensional Topological Insulator, Bi2Te3

- Chemistry, MedicineScience
- 2009

The results establish that Bi2Te3 is a simple model system for the three-dimensional topological insulator with a single Dirac cone on the surface, and points to promising potential for high-temperature spintronics applications.

Emergent quantum confinement at topological insulator surfaces.

- Physics, MedicineNature communications
- 2012

It is demonstrated that a conceptually simple model, implementing a semiconductor-like band bending in a parameter-free tight-binding supercell calculation, can quantitatively explain the entire measured hierarchy of electronic states.

Strong potential impurities on the surface of a topological insulator

- Physics
- 2012

Topological insulators (TIs) are said to be stable against nonmagnetic impurity scattering due to suppressed backscattering in the Dirac surface states. We solve a lattice model of a…

Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi(2)Se(3).

- Physics, MedicineNature communications
- 2010

It is shown that the single Dirac cone comprising the topological state of the prototypical topological insulator Bi(2)Se(3) can co-exist with a two-dimensional electron gas (2DEG), a cornerstone of conventional electronics.

Spontaneous gap generation on the surface of weakly interacting topological insulators using nonmagnetic impurities

- Physics
- 2014

Despite of enormous progress in experimental nanophysics theoretical studies of low-dimensional electron systems still remains a challenging task. Indeed, most of the structures are strongly…

In-Plane Orbital Texture Switch at the Dirac Point in the Topological Insulator Bi2Se3

- Physics
- 2012

Topological insulators are novel macroscopic quantum-mechanical phase of matter, which hold promise for realizing some of the most exotic particles in physics as well as application towards…