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Investigators from Guangzhou University Zero in on Quantum Dots (Photoionization and third-order susceptibility of a neutral donor in ZnS/InP/ZnSe...

September 2, 2014



Investigators from Guangzhou University Zero in on Quantum Dots (Photoionization and third-order susceptibility of a neutral donor in ZnS/InP/ZnSe core/shell spherical quantum dots)

By a News Reporter-Staff News Editor at Physics Week -- Current study results on Quantum Dots have been published. According to news reporting originating in Guangdong, People's Republic of China, by VerticalNews editors, the research stated, "The optical properties of a neutral donor in a ZnS/InP/ZnSe core/shell spherical quantum dot have been investigated using the variational method and the compact density-matrix approach. Two parametric potential is chosen as a confinement potential for the shell."

The news reporters obtained a quote from the research from Guangzhou University, "Considering the band structure of the system it is assumed that electron is localized in MP shell. It is assumed that the impurity is located in the center of quantum dot core (ZnS). The photoionization cross section as well as the third-order nonlinear optical susceptibility of third harmonic generation has been calculated. The results show that the photoionization and the third-order nonlinear optical susceptibility of a donor in a core/shell spherical quantum dot are strongly affected by the shell thickness. We found that small applied shell thickness will lead to a significant blue shift of the peak positions in the optical spectrum."

According to the news reporters, the research concluded: "This kind of structure gives an opportunity to tune and control the photoionization and the third-order nonlinear optical susceptibility of third harmonic generation of a donor impurity by changing the shell thickness."

For more information on this research see: Photoionization and third-order susceptibility of a neutral donor in ZnS/InP/ZnSe core/shell spherical quantum dots. Physica B-Condensed Matter, 2014;449():57-60. Physica B-Condensed Matter can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.

Our news correspondents report that additional information may be obtained by contacting W.F. Xie, Guangzhou Univ, Sch Phys & Elect Engn, Guangzhou 510006, Guangdong, People's Republic of China.

Keywords for this news article include: Asia, Guangdong, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies, People's Republic of China

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Physics Week


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