Magnetic field induced rearrangement of the vacuum charge in a graphene quantum dot with a mass gap

20th International Conference on the Application of High Magnetic Fields in Semiconductor Physics

Maksym, P.A.^1 ; Aoki, H.^2

Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, United Kingdom^1

Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan^2

关键词: External potential;    Mass gap;    Quantum electrodynamics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/456/1/012026/pdf
DOI  :  10.1088/1742-6596/456/1/012026

来源: IOP

【 摘 要 】

A graphene quantum dot provides a solid state analogue of the as yet unobserved charged vacuum predicted by quantum electrodynamics. The magnetic field affects the energy levels that contribute to the vacuum charge and either discharges a vacuum that is already charged or adds charge to it, depending on the position of the affected level relative to the Fermi level. These effects occur in external potentials of a few hundred meV and magnetic fields of a few T, an experimentally realisable regime.