Tunable circular dipolelike system in graphene: Mixed electron-hole states
| Autor: | François M. Peeters, R. Van Pottelberge |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter - Mesoscale and Nanoscale Physics Graphene FOS: Physical sciences 02 engineering and technology Electron hole Electron 021001 nanoscience & nanotechnology Ring (chemistry) 01 natural sciences Molecular physics law.invention Dipole Quantum state law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Energy spectrum Rectangular potential barrier 010306 general physics 0210 nano-technology |
| Zdroj: | Physical review B |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.99.125426 |
| Popis: | Coupled electron-hole states are realized in a system consisting of a combination of an electrostatic potential barrier and ring-shaped potential well, which resembles a circular dipole. A perpendicular magnetic field induces confined states inside the Landau gaps which are mainly located at the barrier or ring. Hybridizations between the barrier and ring states are seen as anticrossings in the energy spectrum. As a consequence, the energy levels show an oscillating dependence on the electrostatic potential strength in combination with an oscillating migration of the wave functions between the barrier and ring. At the anticrossing points the quantum state consists of a mixture of electron and hole. The present system mimics closely the behavior of a relativistic dipole on gapped graphene. Comment: 9 pages and 9 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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