Cotunneling Transport at Singlet-Triplet Transition in Carbon Nanotube Quantum Dots |
| G. Ilnicki a, S. Moriyama b, J. Martinek a,c, T. Fuse b and K. Ishibashi b
a Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań. Poland b Advanced Device Laboratory, RIKEN, 2-1, Hirosawa, Wako, Saitama 351-0198, Japan, c Institute for Materials Research, Tohoku University, Sendai 980-77, Japan |
| Full Text PDF |
| Electronic transport through a quantum dot in the Coulomb-blockade cotunelling regime is investigated both experimentally and theoretically, where a single-wall carbon-nanotube weakly coupled to metallic leads plays a role of the dot. We observe a pronounced current peak for the singlet-triplet transition in a half-shell filling regime due to inelastic cotunneling processes. Using the second order perturbation theory we explain physical mechanisms determining the details of signal. |
| DOI: 10.12693/APhysPolA.115.299 PACS numbers: 73.22.-f, 73.23.Hk, 73.63.Fg |