Excitonic optical properties of wurtzite ZnS quantum dots under pressure

The Journal of Chemical Physics
Zaiping ZengGabriel Bester

Abstract

By means of atomistic empirical pseudopotentials combined with a configuration interaction approach, we have studied the optical properties of wurtzite ZnS quantum dots in the presence of strong quantum confinement effects as a function of pressure. We find the pressure coefficients of quantum dots to be highly size-dependent and reduced by as much as 23% in comparison to the bulk value of 63 meV/GPa obtained from density functional theory calculations. The many-body excitonic effects on the quantum dot pressure coefficients are found to be marginal. The absolute gap deformation potential of quantum dots originates mainly from the energy change of the lowest unoccupied molecular orbital state. Finally, we find that the exciton spin-splitting increases nearly linearly as a function of applied pressure.

References

Jun 15, 1995·Physical Review. B, Condensed Matter·L W Wang, A Zunger
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Sep 15, 1993·Physical Review. B, Condensed Matter·J E Jaffe, A C Hess
Jun 4, 2004·Journal of the American Chemical Society·Yuwen ZhaoJohn Q Xiao
Nov 15, 2005·Nature Materials·Zhongwu WangRussell J Hemley

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Citations

Aug 26, 2017·Scientific Reports·Sotirios BaskoutasGabriel Bester

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