How Correlated Coulomb Quantum Kinetics Affects the Optical Phase of Four-Wave-Mixing Signals

Axt, Vollrath M.; Bartels, G.; Haase, Björn; Meinertz, J.; Neukirch, U.; Gutowski, J.

doi:10.1002/1521-3951(200009)221:1<205::aid-pssb205>3.0.co;2-9

Cited by 9 publications

(7 citation statements)

References 21 publications

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“…In the coherent regime the long overlooked importance of biexcitons was proved by several experimental and theoretical groups. [12][13][14][15] In ZnCdSe heterostructures, with binding energies in the order of 30 meV, a biexciton gas was even proposed as ground state of the highly excited system. 16 Lately, biexcitons in quantum dots are treated as a candidate for an entangledphoton source, 17,18 one of the main ingredients for quantum cryptography.…”

Section: Introductionmentioning

confidence: 99%

Energy renormalization and binding energy of the biexciton

et al. 2003

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We deduce the energy renormalization of the biexciton resonance in ZnSe quantum wells from polarization and intensity dependent pump-probe spectroscopy in the coherent regime. We confirm that the biexciton renormalization is exactly what one would expect from a compound particle of two excitons in opposite circular polarization states. Since the biexciton binding is measured with respect to the exciton resonance one has to consider the renormalization of the latter resonance as well. We present an exact method to determine the real biexciton binding energy using the low-excitation extrapolation of the exciton-to-biexciton transition energy.

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Section: Introductionmentioning

confidence: 99%

Energy renormalization and binding energy of the biexciton

et al. 2003

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“…Two particularly wellsuited and established techniques to investigate these interaction processes are pump and probe ͑P&P͒ 1-9 as well as four-wave mixing ͑FWM͒ spectroscopies. 1,[9][10][11][12][13][14][15][16][17][18] Among the first experiments on coherent light-matter interactions in semiconductors were measurements of the optical Stark effect. [19][20][21] To investigate the Stark effect a strong pump pulse tuned to the band-gap region excites the system, and a weak test pulse probes the shift at the resonance.…”

Section: Introductionmentioning

confidence: 99%

“…1-6,9,11-13,15-18,24 -29 Typically the polarization configurations of the exciting light fields are split between the two most established measurement techniques. The FWM technique was often used for comparisons between linear polarization cases, [10][11][12][13][15][16][17][18] while the P&P experiments mainly examined the circular polarizations. [2][3][4][5]30 This is at least partly based on the lack of a FWM signal for excitation beams with opposite circular polarizations.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4][5]30 This is at least partly based on the lack of a FWM signal for excitation beams with opposite circular polarizations. 17,31 By examining the difference between the linear polarization configurations, the importance of Coulomb correlations such as bound and unbound biexcitons or higher correlations was demonstrated, for example, by means of quantum beats, [11][12][13] spectral weights of signal-components, 15,17 or phase shifts 16,18 in the spectrally and/or temporally resolved FWM signal.…”

Section: Introductionmentioning

confidence: 99%

“…ZnSe-based heterostructures are an ideal model system to meet the requirements in the investigation of coherent exciton interaction in semiconductors beyond the weak-coupling regime. 8,9,[15][16][17][18][27][28][29] The high exciton binding energy in these samples allows a resonant excitation of the sharp and well-separated hh resonance with short laser pulses, without exciting any continuum or lh states. In addition, the large nonlinear coefficients allow experiments with very low excitation intensities.…”

Section: Introductionmentioning

confidence: 99%

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Coherent exciton interactions: Dependence on excitation fluence and polarization

et al. 2002

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The coherent interaction between excitons is revisited by examining the influence of coherent photo-excited excitons on the absorption spectra of ZnSe/ZnMgSSe multiple quantum wells for various polarization configurations. For purely resonant excitation at the heavy-hole exciton, a blueshift of the exciton absorption is found. This distinct blueshift shows a linear dependence on excitation fluence, but with different slopes for different polarization configurations. In the coherent regime the smallest shift is found for an orthogonal linear polarization of the pump and probe, noticeably smaller than the shift for same linear polarization. The strongest shift is found for the same circular polarization. Furthermore, we demonstrate experimentally that pump and probe and four-wave mixing spectra contain equivalent information about the shift and broadening of the exciton line. A linear correlation between the blueshift and the homogeneous linewidth is found in both pump and probe and four-wave mixing.

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High Excitation Effects and Nonlinear Optics

Semiconductor Optics

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How Correlated Coulomb Quantum Kinetics Affects the Optical Phase of Four-Wave-Mixing Signals

Cited by 9 publications

References 21 publications

Energy renormalization and binding energy of the biexciton

Energy renormalization and binding energy of the biexciton

Coherent exciton interactions: Dependence on excitation fluence and polarization

High Excitation Effects and Nonlinear Optics

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