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

Access to Document

Fingerprint Dive into the research topics of 'Observation of enhanced biexcitonic effect in semiconductor nanocrystals'. Together they form a unique fingerprint.

Cite this

@article{5e9385d71c7f42bfb8a4ee1a7cb7d18d,

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",

month = jul,

day = "15",

language = "English",

volume = "64",

pages = "413051--413054",

journal = "Physical Review B-Condensed Matter",

issn = "1098-0121",

publisher = "American Physical Society",

number = "4",

}

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.

UR - http://www.scopus.com/inward/record.url?scp=0035878453&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035878453&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0035878453

VL - 64

SP - 413051

EP - 413054

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 4

M1 - 041305

ER -