Two-electron n-p double quantum dots in carbon nanotubes
Abstract
We consider electron states in n-p double quantum dots defined in a semiconducting carbon nanotube (CNT) by an external potential. We describe formation of extended single-electron orbitals originating from the conduction and valence bands confined in a minimum and a maximum of the external potential, respectively. We solve the problem of a confined electron pair using an exact diagonalization method within the tight-binding approach, which allows for a straightforward treatment of the conduction and valence band states, keeping an exact account for the intervalley scattering mediated by the atomic defects and the electron-electron interaction. The exchange interaction - which in the unipolar double dots is nearly independent of the axial magnetic field (B) and forms singlet-like and triplet-like states - in the n-p system appears only for selected states and narrow intervals of B. In particular the ground-state energy level of a n-p double dot is not split by the exchange interaction and remains four-fold degenerate at zero magnetic field also for a strong tunnel coupling between the dots.
Cite
@article{arxiv.1412.0463,
title = {Two-electron n-p double quantum dots in carbon nanotubes},
author = {E. N. Osika and B. Szafran},
journal= {arXiv preprint arXiv:1412.0463},
year = {2015}
}