Abstract
We investigate ground and excited state transport through small () graphene quantum dots. The successive spin filling of orbital states is detected by measuring the difference between ground-state energies as a function of a magnetic field. For a magnetic field in-plane of the quantum dot the Zeeman splitting of spin states is measured. The results are compatible with a factor of 2, and we detect a spin-filling sequence for a series of states which is reasonable given the strength of exchange interaction effects expected by comparing Coulomb interaction energy and kinetic energy of charge carriers in graphene.
- Received 19 February 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.116801
© 2010 The American Physical Society
Synopsis
A spin on graphene
Published 7 September 2010
Spins in a graphene quantum dot display properties surprisingly similar to those in semiconductor dots, but with potential for longer coherence times.
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