Time-and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots

B Patton, W Langbein, U Woggon, L Maingault, H Mariette

Research output: Contribution to journalArticle

44 Citations (Scopus)

Abstract

We present transient four-wave mixing experiments on individual excitonic transitions in self-assembled CdTe∕ZnTe quantum dots. Using a two-dimensional femtosecond spectroscopy and heterodyne detection of the nonlinear signal we study the dephasing and mutual coherent coupling of single quantum dot states. For the homogeneous linewidth of the zero-phonon line (ZPL) values of 0.06–0.1meV (T2=13–20ps) are measured, and a ZPL weight in the total line shape of Z=0.9 at T=7K is estimated. We observe two linearly polarized fine-structure split exciton transitions with transition dipole moment ratios of 1.0–1.1 deduced from the four-wave mixing (FWM) amplitude, and splitting energies of 0.2–0.35meV deduced from the FWM spectral response or quantum beat period. Coherent coupling between excitonic states is identified by off-diagonal signals in the two-dimensional spectrally-resolved FWM. The presence of an inhomogeneous broadening caused by spectral diffusion in the time ensemble is evidenced by the formation of a photon echo in the time-resolved FWM from a single transition.
LanguageEnglish
Article number235354
Number of pages8
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume73
Issue number23
DOIs
Publication statusPublished - 30 Jun 2006

Fingerprint

Four wave mixing
four-wave mixing
Semiconductor quantum dots
quantum dots
Electron transitions
Dipole moment
spectral sensitivity
Excitons
Linewidth
line shape
synchronism
echoes
dipole moments
Photons
fine structure
excitons
Spectroscopy
photons
spectroscopy
Experiments

Keywords

  • quantum dots
  • excitonic transitions
  • two-dimensional femtosecond spectroscopy
  • inhomogeneous broadening
  • quantum dot states

Cite this

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title = "Time-and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots",
abstract = "We present transient four-wave mixing experiments on individual excitonic transitions in self-assembled CdTe∕ZnTe quantum dots. Using a two-dimensional femtosecond spectroscopy and heterodyne detection of the nonlinear signal we study the dephasing and mutual coherent coupling of single quantum dot states. For the homogeneous linewidth of the zero-phonon line (ZPL) values of 0.06–0.1meV (T2=13–20ps) are measured, and a ZPL weight in the total line shape of Z=0.9 at T=7K is estimated. We observe two linearly polarized fine-structure split exciton transitions with transition dipole moment ratios of 1.0–1.1 deduced from the four-wave mixing (FWM) amplitude, and splitting energies of 0.2–0.35meV deduced from the FWM spectral response or quantum beat period. Coherent coupling between excitonic states is identified by off-diagonal signals in the two-dimensional spectrally-resolved FWM. The presence of an inhomogeneous broadening caused by spectral diffusion in the time ensemble is evidenced by the formation of a photon echo in the time-resolved FWM from a single transition.",
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Time-and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots. / Patton, B; Langbein, W; Woggon, U; Maingault, L; Mariette, H.

In: Physical Review B: Condensed Matter and Materials Physics, Vol. 73, No. 23, 235354 , 30.06.2006.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Time-and spectrally-resolved four-wave mixing in single CdTe/ZnTe quantum dots

AU - Patton, B

AU - Langbein, W

AU - Woggon, U

AU - Maingault, L

AU - Mariette, H

PY - 2006/6/30

Y1 - 2006/6/30

N2 - We present transient four-wave mixing experiments on individual excitonic transitions in self-assembled CdTe∕ZnTe quantum dots. Using a two-dimensional femtosecond spectroscopy and heterodyne detection of the nonlinear signal we study the dephasing and mutual coherent coupling of single quantum dot states. For the homogeneous linewidth of the zero-phonon line (ZPL) values of 0.06–0.1meV (T2=13–20ps) are measured, and a ZPL weight in the total line shape of Z=0.9 at T=7K is estimated. We observe two linearly polarized fine-structure split exciton transitions with transition dipole moment ratios of 1.0–1.1 deduced from the four-wave mixing (FWM) amplitude, and splitting energies of 0.2–0.35meV deduced from the FWM spectral response or quantum beat period. Coherent coupling between excitonic states is identified by off-diagonal signals in the two-dimensional spectrally-resolved FWM. The presence of an inhomogeneous broadening caused by spectral diffusion in the time ensemble is evidenced by the formation of a photon echo in the time-resolved FWM from a single transition.

AB - We present transient four-wave mixing experiments on individual excitonic transitions in self-assembled CdTe∕ZnTe quantum dots. Using a two-dimensional femtosecond spectroscopy and heterodyne detection of the nonlinear signal we study the dephasing and mutual coherent coupling of single quantum dot states. For the homogeneous linewidth of the zero-phonon line (ZPL) values of 0.06–0.1meV (T2=13–20ps) are measured, and a ZPL weight in the total line shape of Z=0.9 at T=7K is estimated. We observe two linearly polarized fine-structure split exciton transitions with transition dipole moment ratios of 1.0–1.1 deduced from the four-wave mixing (FWM) amplitude, and splitting energies of 0.2–0.35meV deduced from the FWM spectral response or quantum beat period. Coherent coupling between excitonic states is identified by off-diagonal signals in the two-dimensional spectrally-resolved FWM. The presence of an inhomogeneous broadening caused by spectral diffusion in the time ensemble is evidenced by the formation of a photon echo in the time-resolved FWM from a single transition.

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