Observation of enhanced biexcitonic effect in semiconductor nanocrystals

Young Nam Hwang, Koo Chul Je, Dongho Kim, Seung Han Park

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We have observed enhanced biexcitonic effect in CdS0.6Se0.4 nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of |1Se1Sh〉 or |1Pe1Ph〉 excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a |1Se1Sh〉 exciton and a two-photon excited |1Se1Ph〉 exciton. We have also theoretically shown that |1Se1Sh;1Se1Ph〉 biexcitons have a large binding energy compared with |1Se1Sh;1Se1Sh〉 and |1Se1Sh;1Pe1Ph〉 biexciton states.

Original languageEnglish
Article number041305
Pages (from-to)413051-413054
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number4
Publication statusPublished - 2001 Jul 15

Fingerprint

Excitons
Nanocrystals
nanocrystals
Photons
excitons
Semiconductor materials
photons
Binding energy
binding energy
Pumps
Spectroscopy
pumps
probes
spectroscopy
excitation
LDS 751

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Observation of enhanced biexcitonic effect in semiconductor nanocrystals",
abstract = "We have observed enhanced biexcitonic effect in CdS0.6Se0.4 nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of |1Se1Sh〉 or |1Pe1Ph〉 excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a |1Se1Sh〉 exciton and a two-photon excited |1Se1Ph〉 exciton. We have also theoretically shown that |1Se1Sh;1Se1Ph〉 biexcitons have a large binding energy compared with |1Se1Sh;1Se1Sh〉 and |1Se1Sh;1Pe1Ph〉 biexciton states.",
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Observation of enhanced biexcitonic effect in semiconductor nanocrystals. / Hwang, Young Nam; Je, Koo Chul; Kim, Dongho; Park, Seung Han.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 4, 041305, 15.07.2001, p. 413051-413054.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Observation of enhanced biexcitonic effect in semiconductor nanocrystals

AU - Hwang, Young Nam

AU - Je, Koo Chul

AU - Kim, Dongho

AU - Park, Seung Han

PY - 2001/7/15

Y1 - 2001/7/15

N2 - We have observed enhanced biexcitonic effect in CdS0.6Se0.4 nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of |1Se1Sh〉 or |1Pe1Ph〉 excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a |1Se1Sh〉 exciton and a two-photon excited |1Se1Ph〉 exciton. We have also theoretically shown that |1Se1Sh;1Se1Ph〉 biexcitons have a large binding energy compared with |1Se1Sh;1Se1Sh〉 and |1Se1Sh;1Pe1Ph〉 biexciton states.

AB - We have observed enhanced biexcitonic effect in CdS0.6Se0.4 nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of |1Se1Sh〉 or |1Pe1Ph〉 excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a |1Se1Sh〉 exciton and a two-photon excited |1Se1Ph〉 exciton. We have also theoretically shown that |1Se1Sh;1Se1Ph〉 biexcitons have a large binding energy compared with |1Se1Sh;1Se1Sh〉 and |1Se1Sh;1Pe1Ph〉 biexciton states.

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