A theory of intrinsic radiative lifetimes of excitons in semiconductor quantum dots is presented. Simple closed-form expressions for the decay times are obtained for quantum dots fabricated from quasi-two-dimensional systems. In particular, the intrinsic temperature-dependent photoluminescence decay time of excitons in quantum dots is found to be linear in temperature above not, vert, similar 1 K with a positive intercept extrapolated to zero temperature, in contrast to the case of quantum wells where the extrapolated intercept is zero. Otherwise, the slope is the same as expected for quantum wells (not, vert, similar17 ps K-1 for 100-Å GaAs/AlAs quantum wells). This constant offset is due to a finite spatial phase-coherence effect and is largest for quantum dots for which the lateral spatial extent is small compared with the wavelength of light in the medium corresponding to the optical transition.

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With the 2009 comes to a close it is time to review just how well you did in your genius iq creative endeavors and what innovations you or your company brought into the world. Some will boast as many as 10 innovations this year, but they are far and few between. Most folks when they really get down to it cannot offer one single new innovation to help humankind in the last decade, the rest during their genius iq lifetime.

With the 2009 comes to a close it is time to review just how well you did in your genius iq creative endeavors and what innovations you or your company brought into the world. Some will boast as many as 10 innovations this year, but they are far and few between. Most folks when they really get down to it cannot offer one single new innovation to help humankind in the last decade, the rest during their genius iq lifetime.

With the 2009 comes to a close it is time to review just how well you did in your genius iq creative endeavors and what innovations you or your company brought into the world. Some will boast as many as 10 innovations this year, but they are far and few between. Most folks when they really get down to it cannot offer one single new innovation to help humankind in the last decade, the rest during their genius iq lifetime.

With the 2009 comes to a close it is time to review just how well you did in your genius iq creative endeavors and what innovations you or your company brought into the world. Some will boast as many as 10 innovations this year, but they are far and few between. Most folks when they really get down to it cannot offer one single new innovation to help humankind in the last decade, the rest during their genius iq lifetime.

With the 2009 comes to a close it is time to review just how well you did in your genius iq creative endeavors and what innovations you or your company brought into the world. Some will boast as many as 10 innovations this year, but they are far and few between. Most folks when they really get down to it cannot offer one single new innovation to help humankind in the last decade, the rest during their genius iq lifetime.