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Spin States in Graphene Quantum Dots

J. Güttinger, T. Frey, C. Stampfer, T. Ihn, and K. Ensslin
Phys. Rev. Lett. 105, 116801 – Published 7 September 2010
Physics logo See Synopsis: A spin on graphene

Abstract

We investigate ground and excited state transport through small (d70nm) 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 g 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.

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  • Received 19 February 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.116801

© 2010 The American Physical Society

Synopsis

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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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Authors & Affiliations

J. Güttinger*, T. Frey, C. Stampfer, T. Ihn, and K. Ensslin

  • Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland

  • *guettinj@phys.ethz.ch
  • Present address: JARA-FIT and II. Institute of Physics, RWTH Aachen, 52074 Aachen, Germany.

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Issue

Vol. 105, Iss. 11 — 10 September 2010

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