Two-electron n -p double quantum dots in carbon nanotubes

  title={Two-electron n -p double quantum dots in carbon nanotubes},
  author={Edyta N. Osika and Bartłomiej Szafran},
  journal={Physical Review B},
We consider electron states in $n\text{\ensuremath{-}}p$ 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… 
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