npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Physics: Sae Mulli 2017; 67: 1174-1179

Published online October 31, 2017 https://doi.org/10.3938/NPSM.67.1174

Copyright © New Physics: Sae Mulli.

Energy Spectrum of a Magnetic Quantum Dot in Graphene

Nojoon MYOUNG1, Gukhyung IHM*2

1 Department of Physics Education, Chosun University, Gwangju 61452, Korea
2 Department of Physics, Chungnam National University, Daejeon 34134, Korea

Correspondence to:ghihm@cnu.ac.kr

Received: August 28, 2017; Revised: September 18, 2017; Accepted: September 18, 2017

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We investigate the eigen energies of a magnetic quantum dot formed in graphene by using the inhomogeneous distributions of magnetic fields. The motivation of our study is to overcome the existing difficulties in the formation of quantum structures in graphene via electrostatic confinements. Strongly localized states on the magnetic quantum dot are observed in the quantum Hall region and can be understood by using magnetic edge states circulating either clockwise or counterclockwise along the boundary of the dot. The eigen energy spectra are shown to depend critically on the number of missing flux quanta in the magnetic quantum dot. The existence of localized magnetic edge states can be proven experimentally by measuring the two-terminal conductance of a small graphene conductor with a magnetic quantum dot formed in its center, which reflects resonant backscattering via the magnetic edge states. 

Keywords: Graphene, Quantum dot, Energy spectrum, Magnetic field

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