Direct Pseudopotential Calculation of Exciton Coulomb and Exchange Energies in Semiconductor Quantum Dots

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.78.915· OSTI ID:450445

Franceschetti, A; Zunger, A ^[1]

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1. National Renewable Energy Laboratory, Golden, Colorado 80401 (United States)

The effects of electron-hole interaction on the exciton energy of semiconductor quantum dots are calculated using pseudopotential wave functions. A comparison with the widely used, but never tested, effective-mass approximation (EMA) shows that the electron-hole Coulomb energy is significantly ({approximately}40{percent}) overestimated by the EMA, and that the scaling with the dot size R is sublinear in 1/R. The exchange splitting is much smaller than the Coulomb energy, and in the case of CdSe quantum dots shows significant deviations from the 1/R{sup 3} scaling predicted by the EMA. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: National Renewable Energy Laboratory
• DOE Contract Number: AC36-83CH10093
• OSTI ID: 450445
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 5 Vol. 78; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CADMIUM SELENIDES
COULOMB ENERGY
EFFECTIVE MASS
ELECTRON-HOLE COUPLING
EXCHANGE INTERACTIONS
EXCITONS
SCALING LAWS
WAVE FUNCTIONS
semiconductor quantum dots