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

doi:10.1103/PhysRevLett.78.915

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

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Abstract

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 (approx. 40%) 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/R3 scaling predicted by the EMA.

Original language	American English
Pages (from-to)	915-918
Number of pages	4
Journal	Physical Review Letters
Volume	78
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevLett.78.915
State	Published - 1997

NREL Publication Number

NREL/JA-451-21625

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10.1103/PhysRevLett.78.915

Cite this

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title = "Direct Pseudopotential Calculation of Exciton Coulomb and Exchange Energies in Semiconductor Quantum Dots",

abstract = "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 (approx. 40%) 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/R3 scaling predicted by the EMA.",

author = "NREL",

year = "1997",

doi = "10.1103/PhysRevLett.78.915",

language = "American English",

volume = "78",

pages = "915--918",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "5",

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PY - 1997

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N2 - 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 (approx. 40%) 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/R3 scaling predicted by the EMA.

AB - 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 (approx. 40%) 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/R3 scaling predicted by the EMA.

U2 - 10.1103/PhysRevLett.78.915

DO - 10.1103/PhysRevLett.78.915

M3 - Article

SN - 0031-9007

VL - 78

SP - 915

EP - 918

JO - Physical Review Letters

JF - Physical Review Letters

IS - 5

ER -

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

Abstract

NREL Publication Number

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