%0 Journal Article
%T Comment on "Fock-Darwin States of Dirac Electrons in Graphene-Based Artificial Atoms"
%A P. S. Park
%A S. C. Kim
%A S. -R. Eric Yang
%J Physics
%D 2012
%I arXiv
%R 10.1103/PhysRevLett.108.169701
%X Chen, Apalkov, and Chakraborty (Phys. Rev. Lett. 98, 186803 (2007)) have computed Fock-Darwin levels of a graphene dot by including only basis states with energies larger than or equal to zero. We show that their results violate the Hellman-Feynman theorem. A correct treatment must include both positive and negative energy basis states. Additional basis states lead to new energy levels in the optical spectrum and anticrossings between optical transition lines.
%U http://arxiv.org/abs/1201.3436v2