Numerical Simulation of Blinking Quantum dot Based on Temperature Dependence 3-Dimensional Levy Random Walk

Authors Anita Sharma , M.N. Bapat
Regional Institute of Education, Bhopal, Madhya Pradesh, India
Issue Volume 3, Year 2011, Number 1, Part 5
Dates Received 04 February 2011, published online 08 December 2011
Citation Anita Sharma, M.N. Bapat, J. Nano- Electron. Phys. 3 No1, 888 (2011)
PACS Number(s) 72.25.Dc, 72.25.Fe, 72.25.Mk, 72.25.Rb
Keywords Quantum dot (12) , Levy statistics, Random walk, Fluorescence.
Blinking statistics of quantum dot has attracted much attraction in recent years. Various experiments were conducted and various theories have been given to explain this phenomenon. However, the problem is not yet resolved. The weak temperature dependence of the power law parameters have complicated the phenomena. We have simulated the blinking statistics of quantum dot based on the random walk model. We have shown that three-dimensional biased Levy random walk of electrons, the bias being the Columbic interaction between electrons and ionized atoms can explain the observed experimental results. We have simulated the blinking properties of quantum dots in a broad temperature range (10-300 K). The distributions exhibit power law behavior for a wide range of temperature, but the power law parameter increases marginally with temperature. The trend of change is independent of the size of the quantum dots as confirmed from the simulation.

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