Spin States in Graphene Quantum Dots

2010/02/19 by J. Güttinger, J. Guettinger, T. Frey +6
Materials Science · Physics and Astronomy · #Graphene research and applications #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mes-hall

paper · pdf · doi:10.1103/physrevlett.105.116801

published as Phys. Rev. Lett. 105, 116801 (2010)

arxiv created 2010/02/19 · openalex publication_date 2010/09/07 · arxiv updated 2010/09/09 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate ground and excited state transport through small (d≈70 nm) 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.

Citations

• Four-Electron Shell Structures and an Interacting Two-Electron System in Carbon-Nanotube Quantum Dots
• Shell Filling in Closed Single-Wall Carbon Nanotube Quantum Dots
• Quantum Spin Hall Effect in Graphene
• Intrinsic and Rashba spin-orbit interactions in graphene sheets
• Spin-orbit coupling in curved graphene, fullerenes, nanotubes, and nanotube caps
• Coherent Manipulation of Coupled Electron Spins in Semiconductor Quantum Dots
• Observation of excited states in a graphene quantum dot
• Single-shot read-out of an individual electron spin in a quantum dot

Cited by

• Nonrelativistic versus relativistic quantum scars in billiard systems