Author: ["H. Ingerslev Jørgensen","K. Grove-Rasmussen","K.-Y. Wang","A. M. Blackburn","K. Flensberg","P. E. Lindelof","D. A. Williams"]
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Abstract
Carbon nanotube double quantum dots, whose shell-like electronic structure is reminiscent of that of a simple molecule, provide a useful system to study the interaction of just a few electrons at a time. An artificial two-atomic molecule, also called a double quantum dot (DQD), is an ideal system for exploring few-electron physics1,2. Interactions between just two electrons have been explored in such systems using the singlet and triplet states as the two states in a quantum two-level system3,4,5,6,7. An alternative and attractive material for studying spin-based two-level systems is the carbon nanotube (CNT), because it is expected to have a very long spin coherence time5. Here, we show that the CNT DQD8,9,10,11,12,13 has a clear shell structure of either four or eight electrons. We show that few-electron physics can be explored in these shells and we find that the singlet and triplet states are present in the four-electron shells. Furthermore, we observe inelastic cotunnelling via the singlet and triplet states, which we use to probe the splitting between the singlet and triplet, in good agreement with theory.Cite this article
Ingerslev Jørgensen, H., Grove-Rasmussen, K., Wang, KY. et al. Singlet–triplet physics and shell filling in carbon nanotube double quantum dots. Nature Phys 4, 536–539 (2008). https://doi.org/10.1038/nphys987 