2008/05/27 by M. R. Buitelaar, Jonas Fransson, J. Fransson +15 · 48 citations
Materials Science · Physics and Astronomy · #Carbon Nanotubes in Composites #Carbon nanotube #Carbon nanotube quantum dot #Condensed matter physics #Coulomb blockade #Electron #Excited state #Graphene research and applications #Hyperfine structure #Materials science #Nanotechnology #Nanotube #Pauli exclusion principle #Physics #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Quantum tunnelling #Singlet state #Spin (aerodynamics) #Spins #Voltage #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.77.245439
published in Physical Review B 77(24) (American Physical Society) · 7 pages, 5 figures
arxiv created 2008/05/27 · openalex publication_date 2008/06/25 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We report Pauli spin blockade in a carbon nanotube double quantum dot defined by tunnel barriers at the contacts and a structural defect in the nanotube. We observe a pronounced current suppression for negative source-drain bias voltages, which is investigated for both symmetric and asymmetric coupling of the quantum dots to the leads. The measured differential conductance agrees well with a theoretical model of a double quantum dot system in the spin-blockade regime, which allows us to estimate the occupation probabilities of the relevant singlet and triplet states. This work shows that effective spin-to-charge conversion in nanotube quantum dots is feasible and opens the possibility of single-spin readout in a material that is not limited by hyperfine interaction with nuclear spins.