Transient oscillations in the vicinity of excitons and in the band of semiconductors

Sokoloff, J. P.; Fluegel, B.; Hulín, D.; Lindberg, M.; Koch, S. W.; Migus, A.; Antonetti, A.; Peyghambarian, N.

doi:10.1103/physrevb.38.7615

Cited by 80 publications

(35 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Traditionally, the PPD signal is expressed as an interference of the probe electric field with the excitonic nonlinear polarization. This was able to explain the SR-PPDT results 8,14,15 in the regime of the third order nonlinear optical susceptibility. One prediction of this description is that no signal in TR-PPD measurements can occur for τ < 0.…”

mentioning

confidence: 64%

“…This is caused by linear and nonlinear interactions among the populations and polarizations, excited in the MQW by the probe and the pump pulses, and the propagating electric fields. An interesting manifestation of the nonlinear optical effects in the pump-probe differential transmission 6,7,8,9 (PPDT) and reflection 10,11 (PPDR) is the transient oscillations observed in spectrally resolved (SR) measurements for negative (−ve) pump-probe delay (τ ). (Here, −ve delay corresponds to the situation when the probe pulse precedes the pump pulse.)…”

mentioning

confidence: 99%

See 1 more Smart Citation

Time-resolved excitonic coherent polarization dynamics in GaAs multiple quantum wells

Pal

Vengurlekar

2003

Phys. Rev. B

View full text Add to dashboard Cite

We investigate pump induced modulation in the temporal evolution of the excitonic coherent polarization generated by a probe pulse in GaAs multiple quantum wells. For this, we perform fs time resolved pump-probe reflectivity measurements using frequency upconversion at both positive and negative pump-probe delays. A contribution arising from interference of excitonic linear and nonlinear polarization, which is usually not considered in describing pump-probe experiments, is required to understand the results.PACS numbers: 78.67.De, 78.47.+p, 82.53.Mj Linear and nonlinear optical response of excitonic resonances in GaAs like semiconductor multiple quantum wells (MQW) to excitation by ultrashort laser pulses and the behavior of the primary and secondary radiation emitted by the excited macroscopic polarization has been of much interest in recent years. Measurement of time resolved emission in the reflection 1,2,3 and transmission 4,5 directions as a result of resonant excitation of excitons in quantum wells (QW) by an ultrashort laser pulse showed a time-profile significantly different from that of the incident pulse as a result of coherent emission from the excitonic polarization surviving up to several ps. A modification in the temporal evolution of the coherent emission in the probe reflection and transmission direction occurs in pump-probe differential (PPD) measurements. This is caused by linear and nonlinear interactions among the populations and polarizations, excited in the MQW by the probe and the pump pulses, and the propagating electric fields. An interesting manifestation of the nonlinear optical effects in the pump-probe differential transmission 6,7,8,9 (PPDT) and reflection 10,11 (PPDR) is the transient oscillations observed in spectrally resolved (SR) measurements for negative (−ve) pump-probe delay (τ ). (Here, −ve delay corresponds to the situation when the probe pulse precedes the pump pulse.) As the PPD measurements entail detection of intensity either of the spectrally or time resolved signals, and as these intensities are not simply Fourier related, important phase related effects are not the same in the two measurements. Therefore, additional insights into the modification of the emission in the probe reflection by a pump pulse may be obtained from time domain measurements. However, to our knowledge, such measurements have not been reported so far.The purpose of this paper is two-fold. First, we present our experimental investigations of the time resolved PPDR from excitons in GaAs MQWs performed using the frequency upconversion technique. We find that the modulation in the dynamics of probe induced excitonic coherence by a pump pulse at low intensities occurs with a rise time of a few ps. However, the rise becomes faster as the pump intensity increases. No signal having the pump pulse polarization is emitted along the probe reflection direction for pump-probe cross-linear polarization. A PPDR signal is observed for −ve delay in both time resolved (TR) and time integrated (TI) measurement...

show abstract

mentioning

confidence: 64%

mentioning

confidence: 99%

Time-resolved excitonic coherent polarization dynamics in GaAs multiple quantum wells

Pal

Vengurlekar

2003

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…Coherent Effects in Semiconductors 5 " 8 We studied in detail a family of pump-probe phenomena we call "coherent oscillations." These phenomena are oscillatory structures in the spectral differential transmission of semiconductors that occur prior to the many-bodied coherent effects such as those described above for doped glasses.…”

Section: Figure 3 Differential Transmission Spectra Of a Cdse 02 S 0mentioning

confidence: 99%

Fellowship in Physics/Modern Optics and Quantum Electronics

Gaskill¹

1990

View full text Add to dashboard Cite

“…The following strong pump pulse then creates an excited electron-hole pair causing a renormalization of the fundamental trion line and thereby perturbs the free induction decay of the probe pulse induced polarization. In a spectral resolved signal such abrupt changes are recorded as spectral oscillations which have been observed in different systems [11][12][13][14][15]. They have often been modeled by including a phenomenological density-dependent dephasing rate [11,16,17] which is similar to our case without Coulomb interaction.…”

mentioning

confidence: 98%

Coulomb correlations in quantum dots and their signatures in single dot femtosecond pump‐probe signals

Huneke

D’Amico

Machnikowski

et al. 2011

Phys. Status Solidi (c)

View full text Add to dashboard Cite

We present a theoretical study of femtosecond pump‐probe experiments on a negatively charged single quantum dot and analyze the influence of Coulomb correlation effects on the lowest trion absorption line. The Coulomb correlated states as well as their corresponding oscillator strengths are calculated by a full diagonalization approach. The dynamics induced by the laser pulses are determined numerically by solving the Liouville‐von Neumann equation in the basis of the calculated few‐particle states. In agreement with the experiment, we demonstrate that Coulomb interactions and carrier relaxations noticeably affect the lowest trion absorption line. For negative and short positive delay times between pump and probe pulse instantaneous Coulomb renormalizations dominate the signal while for longer delay times the signal is governed by carrier relaxations. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Transient oscillations in the vicinity of excitons and in the band of semiconductors

Cited by 80 publications

References 18 publications

Time-resolved excitonic coherent polarization dynamics in GaAs multiple quantum wells

Time-resolved excitonic coherent polarization dynamics in GaAs multiple quantum wells

Fellowship in Physics/Modern Optics and Quantum Electronics

Coulomb correlations in quantum dots and their signatures in single dot femtosecond pump‐probe signals

Contact Info

Product

Resources

About