The Origin of Stokes Shift in Semiconductor Quantum Dots

Details The Origin of Stokes Shift in Semiconductor Quantum Dots The Origin of Stokes Shift in Semiconductor Quantum Dots

2005-03-25

arxiv.org/abs/cond-mat/0503612v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The mechanism of Stokes shift in semiconductor quantum dots is investigated by calculating the energy of the excitonic states. We have taken into account all possible contributions to the total electronic energy in the dot, i.e, dielectric mismatch between dot and surrounding medium, the effects of finite barrier height and electron-hole exchange interaction. The Stokes shift is calculated as a function of radius of dot and compared with experimental data on two different semiconductor based quantum dots. These results provide evidence for exchange splitting of excitonic states, as the mechanism of Stokes shift in quantum dot

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