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HL: Fachverband Halbleiterphysik
HL 44: Quantum dots and wires: preparation and characterization II
HL 44.7: Vortrag
Donnerstag, 28. Februar 2008, 18:15–18:30, EW 201
Charge Sensing in Carbon Nanotube Double Quantum Dots — H. O. H. Churchill1, •D. Marcos2, F. Kuemmeth1, S. K. Watson1,3, and C. Marcus1 — 1Department of Physics. Harvard University. Cambridge 02138. Massachusetts, USA — 2Departamento de Teoría de la Materia Condensada. Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco 28049. Madrid, Spain — 3Department of Physics. Middlebury College. Middlebury 05753. Vermont, USA
Recent advances in fabrication techniques have made it possible tocreate tunable quantum dots on semiconducting nanowires and carbon nanotubes. In particular, double-dots formed on carbon nanotubes [1-3], are interesting candidates for the implementation of qubits based on their unique electronic structure as well as the weakness of nuclear and spin-orbit coupling in the predominantly C12 host. Here we report measurements obtained from an integrated double dot and charge sensor [4,5] fabricated from a single carbon nanotube. The conductance through the single dot allows us to monitor the charge state of the double dot even if it is decoupled from the leads. We also demonstrate fast manipulation of the double dot using pulsed-gates techniques.
[1] M. J. Biercuk et al., Nano Letters 5, 1267 (2005).
[2] S. Sapmaz et al., Semiconductor science and technology, 21(11), S52 (2006).
[3] M. R. Graeber et al., Phys. Rev. B 74, 075427 (2006).
[4] Y. Hu, H. O. H. Churchill et al., Nature Nanotechnology 2, 622 (2007).
[5] M. J. Biercuk et al., Phys. Rev. B 73, 201402(R) (2006).
The NSF-NIRT (EIA-0210736) and the Harvard Center for Nanoscale Systems are acknowledged.