Pasquarello, AlfredoAndreani, L. C.2009-10-082009-10-082009-10-08199110.1103/PhysRevB.44.3162https://infoscience.epfl.ch/handle/20.500.14299/43344WOS:A1991GC06600037A procedure for calculating the resonance width of a state degenerate with a continuum is proposed. It is based on a diagonalization of the Hamiltonian on a finite variational basis followed by application of the Fano theory on the resulting eigenstates. The method is first tested on a one-dimensional model that admits an exact solution, and then applied to the problem of the light-hole (LH) exciton in narrow GaAs-Ga(1-x)Al(x)As quantum wells. The resonance width of the LH exciton is found to be of the order of a meV, and to increase as the well width is reduced.text::journal::journal article::research article