Relative strength of the screened Coulomb interaction and phase-space filling on exciton bleaching in multiple quantum well structures

Moongoo Choi, Koo Chul Je, Sang Youp Yim, Seung Han Park

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Abstract

We investigate the effect of resonantly excited excitons on the bleaching of n=1 and n=2 heavy-hole (hh) exciton resonances in GaAs multiple-quantum-well structures by using a pump-probe spectroscopic technique at low temperature under quasi-stationary excitation conditions. In particular, we present direct observation of long-range Coulomb screening by two-dimensional exciton-exciton interactions along with the unambiguous discrimination of screened Coulomb interaction and phase-space filling on the n=1 hh exciton bleaching. In addition, we find that the strength of long-range Coulomb screening on the n=1 hh exciton bleaching is only two to three times weaker than that of the phase-space filling at 10 K.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number8
DOIs
Publication statusPublished - 2004 Aug 1

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bleaching
Bleaching
Coulomb interactions
Excitons
Semiconductor quantum wells
excitons
quantum wells
interactions
Screening
screening
discrimination
LDS 751
Pumps
pumps
probes
excitation

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Relative strength of the screened Coulomb interaction and phase-space filling on exciton bleaching in multiple quantum well structures",
abstract = "We investigate the effect of resonantly excited excitons on the bleaching of n=1 and n=2 heavy-hole (hh) exciton resonances in GaAs multiple-quantum-well structures by using a pump-probe spectroscopic technique at low temperature under quasi-stationary excitation conditions. In particular, we present direct observation of long-range Coulomb screening by two-dimensional exciton-exciton interactions along with the unambiguous discrimination of screened Coulomb interaction and phase-space filling on the n=1 hh exciton bleaching. In addition, we find that the strength of long-range Coulomb screening on the n=1 hh exciton bleaching is only two to three times weaker than that of the phase-space filling at 10 K.",
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T1 - Relative strength of the screened Coulomb interaction and phase-space filling on exciton bleaching in multiple quantum well structures

AU - Choi, Moongoo

AU - Je, Koo Chul

AU - Yim, Sang Youp

AU - Park, Seung Han

PY - 2004/8/1

Y1 - 2004/8/1

N2 - We investigate the effect of resonantly excited excitons on the bleaching of n=1 and n=2 heavy-hole (hh) exciton resonances in GaAs multiple-quantum-well structures by using a pump-probe spectroscopic technique at low temperature under quasi-stationary excitation conditions. In particular, we present direct observation of long-range Coulomb screening by two-dimensional exciton-exciton interactions along with the unambiguous discrimination of screened Coulomb interaction and phase-space filling on the n=1 hh exciton bleaching. In addition, we find that the strength of long-range Coulomb screening on the n=1 hh exciton bleaching is only two to three times weaker than that of the phase-space filling at 10 K.

AB - We investigate the effect of resonantly excited excitons on the bleaching of n=1 and n=2 heavy-hole (hh) exciton resonances in GaAs multiple-quantum-well structures by using a pump-probe spectroscopic technique at low temperature under quasi-stationary excitation conditions. In particular, we present direct observation of long-range Coulomb screening by two-dimensional exciton-exciton interactions along with the unambiguous discrimination of screened Coulomb interaction and phase-space filling on the n=1 hh exciton bleaching. In addition, we find that the strength of long-range Coulomb screening on the n=1 hh exciton bleaching is only two to three times weaker than that of the phase-space filling at 10 K.

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