Observation of enhanced biexcitonic effect in semiconductor nanocrystals

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

Observation of enhanced biexcitonic effect in semiconductor nanocrystals

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

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

Abstract

We have observed enhanced biexcitonic effect in CdS_0.6Se_0.4 nanocrystals by means of femtosecond two-photon pump-probe spectroscopy. In contrast to a weak biexcitonic photoinduced absorption in the presence of |1S_e1S_h〉 or |1P_e1P_h〉 excitons due to one-photon excitation, we have found a pronounced photoinduced absorption arising from a strong Coulomb coupling between a |1S_e1S_h〉 exciton and a two-photon excited |1S_e1P_h〉 exciton. We have also theoretically shown that |1S_e1S_h;1S_e1P_h〉 biexcitons have a large binding energy compared with |1S_e1S_h;1S_e1S_h〉 and |1S_e1S_h;1P_e1P_h〉 biexciton states.

Original language	English
Article number	041305
Pages (from-to)	413051-413054
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	64
Issue number	4
Publication status	Published - 2001 Jul 15

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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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.",

author = "Hwang, {Young Nam} and Je, {Koo Chul} and Dongho Kim and Park, {Seung Han}",

year = "2001",

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language = "English",

volume = "64",

pages = "413051--413054",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

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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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M3 - Article

AN - SCOPUS:0035878453

VL - 64

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JO - Physical Review B-Condensed Matter

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SN - 1098-0121

IS - 4

M1 - 041305

ER -

Observation of enhanced biexcitonic effect in semiconductor nanocrystals

Abstract

All Science Journal Classification (ASJC) codes

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