Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

Georgi L. Dakovski; Song Lan; Chen Xia; Jie Shan

doi:10.1021/jp069026o

Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

Georgi L. Dakovski, Song Lan, Chen Xia, Jie Shan

Physics

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

Terahertz time-domain spectroscopy was employed to investigate photogenerated excitons in PbSe and CdSe quantum dots (QD) of radii less than their exciton Bohr radius. The exciton response was found to be "atom"-like and rise with increasing the carrier effective mass. Excitons in CdSe were found to be about two times more polarizable than those in PbSe QDs of equal size. These experimental findings including both the magnitude of the exciton polarizability and its variation with the QD radius were well described by an effective mass model with multiband structures of the QD materials.

Original language	English (US)
Pages (from-to)	5904-5908
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	111
Issue number	16
DOIs	https://doi.org/10.1021/jp069026o
State	Published - Apr 26 2007

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
General Energy
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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10.1021/jp069026o

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abstract = "Terahertz time-domain spectroscopy was employed to investigate photogenerated excitons in PbSe and CdSe quantum dots (QD) of radii less than their exciton Bohr radius. The exciton response was found to be {"}atom{"}-like and rise with increasing the carrier effective mass. Excitons in CdSe were found to be about two times more polarizable than those in PbSe QDs of equal size. These experimental findings including both the magnitude of the exciton polarizability and its variation with the QD radius were well described by an effective mass model with multiband structures of the QD materials.",

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T1 - Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

AU - Dakovski, Georgi L.

AU - Lan, Song

AU - Xia, Chen

AU - Shan, Jie

PY - 2007/4/26

Y1 - 2007/4/26

N2 - Terahertz time-domain spectroscopy was employed to investigate photogenerated excitons in PbSe and CdSe quantum dots (QD) of radii less than their exciton Bohr radius. The exciton response was found to be "atom"-like and rise with increasing the carrier effective mass. Excitons in CdSe were found to be about two times more polarizable than those in PbSe QDs of equal size. These experimental findings including both the magnitude of the exciton polarizability and its variation with the QD radius were well described by an effective mass model with multiband structures of the QD materials.

AB - Terahertz time-domain spectroscopy was employed to investigate photogenerated excitons in PbSe and CdSe quantum dots (QD) of radii less than their exciton Bohr radius. The exciton response was found to be "atom"-like and rise with increasing the carrier effective mass. Excitons in CdSe were found to be about two times more polarizable than those in PbSe QDs of equal size. These experimental findings including both the magnitude of the exciton polarizability and its variation with the QD radius were well described by an effective mass model with multiband structures of the QD materials.

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JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

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ER -

Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

Abstract

All Science Journal Classification (ASJC) codes

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