It is shown that t,he excitonic ion should be stable for any value of the electron to hole effective mass ratio u. An accurate calculation of the binding energy is also performed, in excellent agreement with the values previously obtained in the limiting cases u = 0 and u = 1. I n particular, the involved binding energy in copper halides is large enough to lead to an observable effect.On montre que l'ion excitonique est stable quel que soit la valeur du rapport u des masses effectives de 1'6lectron et du trou. On effectue un calcul precis de 1'6nergie de liaison, en excellent accord avec les valeurs obtenues a.nt6rieurement dans les cas limites u = 0 et G = 1. En particulier, dam les halogenures de cuivre cette energie de liaison est assez grande pour &re observable.
We study the influence of a uniform magnetic field on the excitonic trion and compute the ground-state energy using a 34-term variational wave function in the low-field limit. We show that there appear additional Landau levels which allow one to distinguish the trions from other neutral complexes.
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