Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-21
Nature Physics 4, 536 - 539 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
Supplement available at: http://www.fys.ku.dk/~hij/public/singlet-triple_supp.pdf
Scientific paper
10.1038/nphys987
An artifcial two-atomic molecule, also called a double quantum dot (DQD), is an ideal system for exploring few electron physics. Spin-entanglement between just two electrons can be explored in such systems where singlet and triplet states are accessible. These two spin-states can be regarded as the two states in a quantum two-state system, a so-called singlet-triplet qubit. A very attractive material for realizing spin based qubits is the carbon nanotube (CNT), because it is expected to have a very long spin coherence time. Here we show the existence of a gate-tunable singlet-triplet qubit in a CNT DQD. We show that the CNT DQD has clear shell structures of both four and eight electrons, with the singlet-triplet qubit present in the four-electron shells. We furthermore observe inelastic cotunneling via the singlet and triplet states, which we use to probe the splitting between singlet and triplet, in good agreement with theory.
Blackburn A. M.
Flensberg Karsten
Grove-Rasmussen Kasper
Jørgensen Henrik Ingerslev
Lindelof Poul Erik
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