Volume 88, Number 1, October 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||27 October 2009|
Magnetically confined states of Dirac electrons in a graphene-based quantum annulus
National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University Nanjing, 210093, China
Corresponding author: email@example.com
Accepted: 30 September 2009
We propose to confine massless Dirac fermions in a graphene-based quantum annulus induced by an inhomogeneous magnetic field. It is found that influenced by an effective magnetic potential well the degeneracies of the relativistic Landau levels can be lifted, and the angular-momentum transitions in the ground state can occur by adjusting the geometry of the annulus and/or the magnitude of the magnetic field. Especially for high magnetic fields the system can form the strongly localized states in the annulus and around its boundaries, and some energy levels can reconverge to the Landau levels. Moreover, it is predicted that the dipole-allowed optical transitions between the low-lying energy levels can be measured by far-infrared spectroscopy, and the optical spectrum consists of a series of unequally spaced peaks.
PACS: 73.21.-b – Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems / 75.70.Ak – Magnetic properties of monolayers and thin films / 81.05.Uw – Carbon, diamond, graphite
© EPLA, 2009
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.