Variational Calculation of Fano Linewidth - Application to Excitons in Quantum-Wells

A 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.


Published in:
Physical Review B, 44, 7, 3162-3167
Year:
1991
ISSN:
0163-1829
Laboratories:




 Record created 2009-10-08, last modified 2018-01-28


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