Single-electron transport measurements have been carried out at 1.5 K on single-wall carbon nanotube (SWCNT) quantum dots (QDs) under terahertz (THz) irradiation with a frequency of 2.5 THz. The most important finding in this study was new side-peaks that appeared only under the THz irradiation. From the detailed analysis with energy scales associated with the QDs, we conclude that the side-peaks originate from the photon-assisted tunnelling (PAT) of an electron in the QD to the drain electrode. The present THz-PAT is the first observation in QDs because of the larger energy scales in a SWCNT QD, compared with those of standard semiconductor QDs.
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Fuse et al. (2006) studied this question.
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