### Effect of the Stark confinement on the excitonic optical spectrum of an array of coupled quantum dots

### Abstract

We investigate theoretically the influence of a uniform electric field on the optical properties of a linear array of coupled quantum dots. We study the excitonic spectrum of this system by solving the electron-hole effective-mass Hamiltonian. The potential along the array is modeled by a periodic square-well potential and we assume parabolic lateral confining potentials for electrons and holes. We calculate the excitonic absorption coefficient as a function of the quantum dot size and the applied electric field. We discuss the different confinement regimes. The results illustrate the competing effects of the lateral confinement, the electric-field confinement, and the Coulomb interaction. We show that in the weak-lateral confinement regime the natural coordinates are the relative and the center-of-mass coordinates which are weakly coupled by the lateral potential. In the strong-lateral confinement regime the electrons and holes are weakly correlated and the spectrum can be explained in a single-particle picture.

### Más información

Título según WOS: | ID WOS:A1997WW80300074 Not found in local WOS DB |

Título de la Revista: | PHYSICAL REVIEW B |

Volumen: | 55 |

Número: | 16 |

Editorial: | American Physical Society |

Fecha de publicación: | 1997 |

Página de inicio: | 10688 |

Página final: | 10693 |

DOI: |
10.1103/PhysRevB.55.10688 |

Notas: | ISI |