Helical states around a mass-inverted quantum dot in graphene
| Autor: | Nojoon Myoung |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Graphene FOS: Physical sciences General Physics and Astronomy Heterojunction 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Symmetry (physics) law.invention Topological defect Domain wall (magnetism) Quantum dot law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences General Materials Science 0210 nano-technology Bilayer graphene Mass gap |
| Zdroj: | Current Applied Physics. 23:57-61 |
| ISSN: | 1567-1739 |
| DOI: | 10.1016/j.cap.2020.12.018 |
| Popis: | Topologically protected chiral states at a mass-inverted quantum dot in graphene are studied by analyzing both tight-binding and kernal polynomial method calculations. The mass-inverted quantum dot is introduced by considering a heterojunction between two different mass domains, which is similar to the domain wall in bilayer graphene. The numerical results show emergent metallic channels across the mass gap when the signs of the mass terms are opposite. The eigenstates of the metallic channels are revealed to be doubly degenerate---each state propagates along opposite directions, maintaining the time-reversal symmetry of graphene. The robustness of the metallic channels is further examined, concluding with the fact that chiral states are secured unless atomic vacancies form near the domain wall. Such chiral states circulating along the topological defects may pave a novel route to engineering topological states based on graphene. Comment: 5 pages, 5 figures |
| Databáze: | OpenAIRE |
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