Electrostatically Shielded Quantum Confined Stark Effect Inside Polar Nanostructures
- Spilios RiyopoulosAffiliated withScience Applications International Corporation Email author
The effect of electrostatic shielding of the polarization fields in nanostructures at high carrier densities is studied. A simplified analytical model, employing screened, exponentially decaying polarization potentials, localized at the edges of a QW, is introduced for the ES-shielded quantum confined Stark effect (QCSE). Wave function trapping within the Debye-length edge-potential causes blue shifting of energy levels and gradual elimination of the QCSE red-shifting with increasing carrier density. The increase in the e−h wave function overlap and the decrease of the radiative emission time are, however, delayed until the “edge-localization” energy exceeds the peak-voltage of the charged layer. Then the wave function center shifts to the middle of the QW, and behavior becomes similar to that of an unbiased square QW. Our theoretical estimates of the radiative emission time show a complete elimination of the QCSE at doping densities ≥1020 cm−3, in quantitative agreement with experimental measurements.
- Electrostatically Shielded Quantum Confined Stark Effect Inside Polar Nanostructures
- Open Access
- Available under Open Access This content is freely available online to anyone, anywhere at any time.
Nanoscale Research Letters
- Online Date
- May 2009
- Online ISSN
- Springer New York
- Additional Links
- Author Affiliations
- 1. Science Applications International Corporation, McLean, VA, 22102, USA