Femtosecond four-wave-mixing spectroscopy of interacting magnetoexcitons in semiconductor quantum wells

Yokojima, Satoshi; Meier, Torsten; Chernyak, Vladimir; Mukamel, Shaul

doi:10.1103/physrevb.59.12584

Cited by 7 publications

(27 citation statements)

References 78 publications

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“…For short pump durations, we reproduce the biexciton oscillations in the TI-FWM signal. 65 As the pump duration becomes longer than the biexciton binding energy, we find a crossover between two exponential regimes in the spectrally resolved ͑SR͒ FWM and TI FWM spectra, originating from different dephasing rates of the exciton and biexciton bound states.…”

Section: Introductionmentioning

confidence: 75%

“…64,65 The corresponding potential V A (p,q) is short-ranged, and its specific form depends on the sample. 64 In order to proceed further, we assume the following form for the s-wave component of this potential:…”

Section: Analytic Solution In a Strong Magnetic Fieldmentioning

confidence: 99%

“…[52][53][54][55][56][57][58][59][60][61][62][63][64][65] In bulk semiconductors, FWM experiments showed a strong enhancement of the FWM signal with increasing magnetic field. [61][62][63] At the same time, the time-integrated signal exhibited a long non-Markovian decay for negative time delays.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafast Coulomb-induced dynamics of quantum well magnetoexcitons

2000

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We study theoretically the ultrafast nonlinear optical response of quantum well excitons in a perpendicular magnetic field. We show that for magnetoexcitons confined to the lowest Landau levels, the third-order four-wave-mixing ͑FWM͒ polarization is dominated by the exciton-exciton interaction effects. For repulsive interactions, we identify two regimes in the time evolution of the optical polarization characterized by exponential and power law decay of the FWM signal. We describe these regimes by deriving an analytical solution for the memory kernel of the two-exciton wave function in a strong magnetic field. For strong exciton-exciton interactions, the decay of the FWM signal is governed by an antibound resonance with an interactiondependent decay rate. For weak interactions, the continuum of exciton-exciton scattering states leads to a long tail of the time-integrated FWM signal for negative time delays, which is described by the product of a power law and a logarithmic factor. By combining this analytic solution with numerical calculations, we study the crossover between the exponential and nonexponential regimes as a function of magnetic field. For attractive exciton-exciton interactions, we show that the time evolution of the FWM signal is dominated by biexcitonic effects.

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Section: Introductionmentioning

confidence: 75%

Section: Analytic Solution In a Strong Magnetic Fieldmentioning

confidence: 99%

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Ultrafast Coulomb-induced dynamics of quantum well magnetoexcitons

2000

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“…The excitonic basis has been employed by a number of authors 14,18,21,22 In particular, it has been used to investigate the intraband dynamics of CDQW's ͑Ref. 18͒ and BSSL's ͑Ref.…”

Section: Introductionmentioning

confidence: 99%

“…This has been done in the excitonic basis for a single quantum well in a magnetic field. 21 However, the treatment of more complicated systems such as an AQWS to third order can become very computationally intensive if one does not find an efficient way of dealing with the exciton-exciton interactions. It is with this aim in mind that this work has been performed.…”

Section: Introductionmentioning

confidence: 99%

Intraband polarization as the source of degenerate four-wave mixing signals in asymmetric semiconductor quantum well structures

Dignam

Hawton

2003

Phys. Rev. B

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We have developed a formalism for calculating the coherent response of asymmetric semiconductor quantum well structures to ultrashort optical pulses. We work in an excitonic basis and include exciton-exciton interactions via the long-wavelength portion of the excitonic intraband polarization. We apply this formalism to the calculation of degenerate four-wave mixing intensities of a biased semiconductor superlattice and find that many aspects of the four-wave mixing signals are most naturally interpreted as directly resulting from the scattering of excitons off of the intraband polarization grating. We furthermore develop an extremely accurate method of factoring the dynamical equations that does not suffer from the problem encountered by the semiconductor Bloch equations in the Hartree-Fock approximation.

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Chapter 6 Coulomb correlation signatures in the excitonic optical nonlinearities of semiconductors

Meier

Koch

2001

Ultrafast Physical Processes in Semiconductors

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Femtosecond four-wave-mixing spectroscopy of interacting magnetoexcitons in semiconductor quantum wells

Cited by 7 publications

References 78 publications

Ultrafast Coulomb-induced dynamics of quantum well magnetoexcitons

Ultrafast Coulomb-induced dynamics of quantum well magnetoexcitons

Intraband polarization as the source of degenerate four-wave mixing signals in asymmetric semiconductor quantum well structures

Chapter 6 Coulomb correlation signatures in the excitonic optical nonlinearities of semiconductors

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