TY - JOUR
T1 - Effect of Negatively Charged Impurity on Graphene Magnetic Rings
AU - Lee, Chak Man
AU - Chan, Kwok Sum
AU - Ho, Johnny Chung Yin
PY - 2014
Y1 - 2014
N2 - 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 r(02)(2)/a(2) is 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.
AB - 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 r(02)(2)/a(2) is 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.
U2 - 10.7566/JPSJ.83.034007
DO - 10.7566/JPSJ.83.034007
M3 - 21_Publication in refereed journal
VL - 83
SP - 034007 -
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 3
ER -