The excitonic energies are computed in superlattices from the poles in the imaginary part of the susceptibility, using an appropriate Green's function expression for the coherent amplitude function of the electron-hole pair. Solving the Maxwell equations, the polariton states are obtained and the optical properties are computed. The procedure includes the effects of coherence between the carriers and the electromagnetic field, and it does not require any type of additional boundary conditions. Detailed calculations in GaAs/Ga1-xAlxAs superlattices show polaritonic effects in the optical properties, in particular a peculiar fine-structure lineshape of the n = 1 and n = 2 hh and Ih excitons is obtained. A comparison with similar calculations in bulk GaAs clearly shows the roles of quantum confinement and of anisotropy in the superlattice.
Excitonic polaritons in superlattices
TREDICUCCI, ALESSANDRO;
1995
Abstract
The excitonic energies are computed in superlattices from the poles in the imaginary part of the susceptibility, using an appropriate Green's function expression for the coherent amplitude function of the electron-hole pair. Solving the Maxwell equations, the polariton states are obtained and the optical properties are computed. The procedure includes the effects of coherence between the carriers and the electromagnetic field, and it does not require any type of additional boundary conditions. Detailed calculations in GaAs/Ga1-xAlxAs superlattices show polaritonic effects in the optical properties, in particular a peculiar fine-structure lineshape of the n = 1 and n = 2 hh and Ih excitons is obtained. A comparison with similar calculations in bulk GaAs clearly shows the roles of quantum confinement and of anisotropy in the superlattice.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
