Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 45: Quantenpunkte und -dr
ähte: Transporteigenschaften II

HL 45.5: Vortrag

Montag, 7. März 2005, 16:00–16:15, TU P-N202

Quantum transport in single-walled carbon nanotubes — •Carola Meyer, Pablo Jarillo-Herrero, Sami Sapmaz, and Leo Kouwenhoven — Kavli Institute of Nanoscience, Delft University of Technology, PO Box 5046, 2600 GA, Delft, The Netherlands

Single-walled carbon nanotubes (SWCNTs) are one-dimensional conductors, either metallic or semiconducting depending on their chirality. In the past years, the study of quantum transport through SWCNTs has revealed many quantum phenomena, e.g. quantum dot shell filling, Fabry-Perot-like interference, Kondo effect, etc. Recently, few electron-hole dots on semiconducting SWCNTs have been demonstrated in our group, and the behavior in a magnetic field has been studied. It is possible to fabricate gate structures to deplete certain parts of these semiconducting tubes, i.e. to create tunable barriers. This opens up the opportunity for a scalable electron spin quantum computing concept, if microwaves can be coupled to the system. The unique properties of SWCNTs, i.e. small spin orbit coupling, small phonon density of states, and small abundance of nuclear spins, are expected lead to long coherence times of electron spins in the dots. Here, we will present our concept, discuss the main problems that have to be solved and show first attempts towards a device that could be used for quantum computing.