Abstract

MOSCOSO-MORENO, C.A.; FRANCO, R  and  SILVA-VALENCIA, J. The binding energy of light excitons in spherical quantum dots under hydrostatic pressure. Rev. mex. fis. [online]. 2007, vol.53, n.3, pp.189-193. ISSN 0035-001X.

We study the effects of hydrostatic pressure over the ground state binding energy of light hole excitons confined in GaAs - Ga_1-xAl_xAs spherical quantum dots. We applied the variational method using 1s-hydrogenic wavefunctions, in the framework of the effective mass approximation. We computed the exciton binding energy as a function of the dot radius, Al concentrations and pressures. Our results show that (i) the hydrostatic pressure increases the binding energy, for all quantum dot radii; (ii) the binding energy is an increasing function of the Al concentration, for fixed radius and pressure, especially for a smaller dot; (iii) the binding energy follows approximately a linear dependence with the pressure, for fixed radius and Al concentration.

Keywords : Quantum dot; excitons; hydrostatic pressure.

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