Graphene quantum dot with a hydrogenic impurity

International Physics Conference at the Anatolian Peak 2016

Gökçek, Neslihan^1 ; Kandemir, Bekir Sitki^1

Department of Physics, Faculty of Sciences, Ankara University, Tandoan, Ankara

06100, Turkey^1

关键词: Carrier confinements;    Critical value;    Dot geometry;    Electronic energy levels;    Electronic spectrum;    Hydrogenic impurities;    Impurity strength;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/707/1/012014/pdf
DOI  :  10.1088/1742-6596/707/1/012014

来源: IOP

【 摘 要 】

We investigate the electronic energy levels of a circular graphene quantum dot with a hydrogenic impurity placed at the center of the dot. We have adopted a variational scheme in such a way that the trial wave functions take into account the carrier confinement due to the dot geometry as well as the effect of the magnetic field. We found that the presence of impurity strongly modifies the electronic spectrum of the graphene quantum dot. We also calculated the critical value of the impurity strength as a function of dot radius.