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 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 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
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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 journal › Article
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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M3 - Article
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 -