Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots

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

Research output: Contribution to journalArticle

17 Citations (Scopus)

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 languageEnglish (US)
Pages (from-to)5904-5908
Number of pages5
JournalJournal of Physical Chemistry C
Volume111
Issue number16
DOIs
StatePublished - Apr 26 2007

Fingerprint

Excitons
Semiconductor quantum dots
quantum dots
excitons
radii
lead selenide
LDS 751
Spectroscopy
Atoms
spectroscopy
atoms

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Dakovski, Georgi L. ; Lan, Song ; Xia, Chen ; Shan, Jie. / Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots. In: Journal of Physical Chemistry C. 2007 ; Vol. 111, No. 16. pp. 5904-5908.
@article{1c12776a7efa4c5b9b0b54b435ede400,
title = "Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots",
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.",
author = "Dakovski, {Georgi L.} and Song Lan and Chen Xia and Jie Shan",
year = "2007",
month = "4",
day = "26",
doi = "10.1021/jp069026o",
language = "English (US)",
volume = "111",
pages = "5904--5908",
journal = "Journal of Physical Chemistry C",
issn = "1932-7447",
publisher = "American Chemical Society",
number = "16",

}

Terahertz electric polarizability of excitons in PbSe and CdSe quantum dots. / Dakovski, Georgi L.; Lan, Song; Xia, Chen; Shan, Jie.

In: Journal of Physical Chemistry C, Vol. 111, No. 16, 26.04.2007, p. 5904-5908.

Research output: Contribution to journalArticle

TY - JOUR

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.

UR - http://www.scopus.com/inward/record.url?scp=34248390199&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34248390199&partnerID=8YFLogxK

U2 - 10.1021/jp069026o

DO - 10.1021/jp069026o

M3 - Article

AN - SCOPUS:34248390199

VL - 111

SP - 5904

EP - 5908

JO - Journal of Physical Chemistry C

JF - Journal of Physical Chemistry C

SN - 1932-7447

IS - 16

ER -