Effect of negatively charged impurity on graphene magnetic rings

Chak Man Lee, Kwok Sum Chan, Johnny Chung Yin Ho

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Using the massless Dirac-Weyl model of monolayer graphene, we study the effect of a negatively charged Coulomb impurity on the low-lying spectra of single-electron magnetic dot and ring systems. The numerical results show that the electron-hole symmetry in the spectra is broken by the Coulomb potential, and the original degenerate energy level lying at zero energy becomes nondegenerate and splits into infinite discrete angular momentum states, which have positive energies and thus are electron-like. For higher LLs, each has a reverse ordering of the energy levels when r022/a2is larger than its critical value in the positive energy states for magnetic dot systems owing to the competition between the Coulomb potential and the magnetic confinement.

Original languageEnglish
Article number034007
Journaljournal of the physical society of japan
Issue number3
Publication statusPublished - Mar 15 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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