Electron transport through double-walled carbon nanotube quantum dots
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Electron transport through double-walled carbon nanotube quantum dots (DWCNT-QD) was calculated using full valence description of the electronic structure. Rolling pin model was used to measure the electron transport through both the walls of the DWCNT-QD. Three combinations of metallic (M) and zigzag semiconductor (S) nanotubes, i.e., M@S, S@M, and S@S, were studied for various diameters, and the corresponding I–V curves were obtained using the Landauer method. The transmission through the nanotubes was calculated using elastic scattering quantum chemistry (ESQC) method. A significant difference of 0.5 to 1.5 μA in the current through the two walls of the DWCNT was found for the (4, 4)@(10, 9) and (5, 4)@(10, 9). In all other cases, the behavior of both the tubes in a DWCNT-QD was very similar to that of the corresponding single-walled carbon nanotube quantum dots (SWCNT-QD). The intermixing and correlation of the electronic states of the inner and outer shells of the DWCNTs responsible for such results were analyzed and discussed.
KeywordsElectron transport Quantum dots Carbon nanotubes Molecular electronics ESQC
SS thanks the computational facilities at the IIIT Bangalore to carry out the calculations. BKM acknowledges the SERB, Government of India, for the fund received (SERB-767), which enabled the execution of this work. We thank Professor Christian Joachim (CEMES, CNRS) for his valuable discussions.
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Conflict of interest
The authors declare that they have no conflict of interest.
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