Polarization-dependent picosecond excitonic nonlinearities and the complexities of disorder

Cundiff, Steven T.; Wang, H.; Steel, Duncan G.

doi:10.1103/physrevb.46.7248

Cited by 66 publications

(24 citation statements)

References 18 publications

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“…It was shown by timeresolved FWM measurements, that low-intensity ͑↑,↑͒ and ͑↑,→͒ polarized excitation gives rise to a PE and to a prompt signal or FPD, respectively. [37][38][39][40] Since the delayed signal saturates at smaller intensities than the FPD a twocomponent behavior has been observed under appropriate conditions similar to our observations. These results were attributed to the coexistence of extended and localized excitons due to interface fluctuations in the QW giving rise to a FPD and PE signals, respectively.…”

Section: B Fwm Signal Analysissupporting

confidence: 86%

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
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. Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons in ZnSxSe1 -x/ZnSe structures. Physical Review B, 56(19), 12581-12588. DOI: 10.1103/PhysRevB.56.12581 Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons in ZnS We investigate the dephasing of heavy-hole excitons in different free-standing ZnS x Se 1Ϫx /ZnSe layer structures by spectrally resolved transient four-wave mixing. ZnSe layers of 80, 8, and 4 nm thickness with ternary barriers are studied, representing the crossover from quasi-three-dimensional to quasi-two-dimensional excitons. A common feature of the four-wave-mixing signals is the appearance of two components, a prompt signature and a delayed photon echo, which are identified by their different polarization dependencies and decay times. For crosslinear polarized fields, the rapidly decaying signal is attributed to the response of spin-coupled exciton states, with a decay time given by the inhomogeneous broadening. The photon echo is due to a distribution of localized, noninteracting excitons. We determine the exciton-exciton and excitonphonon scattering cross sections for different dimensionalities by the intensity and temperature dependencies of the exciton dephasing. ͓S0163-1829͑97͒02943-3͔

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Section: B Fwm Signal Analysissupporting

confidence: 86%

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
View full text Add to dashboard Cite

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“…4(d)-4(g), the calculations well reproduce the experimental results. We note that the FWM signal intensities of the = 0 and 1 components are nearly identical, and this allows us to compare the two components under similar excitation conditions [21,22].…”

Section: B Exciton Oam Excited With Multiple-mode Lg Pump and Singlementioning

confidence: 94%

“…The exciton dephasing dynamics are thus obtained by detecting the signal as a function of the delay time τ between the pump and probe pulses [20][21][22][23][24].…”

Section: Coherent Dynamics Of Exciton Oammentioning

confidence: 99%

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Coherent dynamics of exciton orbital angular momentum transferred by optical vortex pulses

et al. 2016

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The coherent dynamics of the exciton center-of-mass motion in bulk GaN are studied using degenerate four-wave-mixing (FWM) spectroscopy with Laguerre-Gaussian (LG) mode pulses. We evaluate the exciton orbital angular momentum (OAM) dynamics from the degree of OAM, which is derived from the distributions of OAM (topological charge) of the FWM signals. When excitons are excited with two single-mode LG pulses, the exciton OAM decay time significantly exceeds the exciton dephasing time, which can be attributed to high uniformity of the exciton dephasing in our bulk sample because the decoherence of the exciton OAM is governed by the angular variation in the exciton dephasing. We also analyze the topological charge ( ) dependence of the OAM decay using a multiple-mode LG pump pulse, which allows us to simultaneously observe the dynamics of the exciton OAM for different values under the same excitation conditions. The OAM decay times of the = 1 component are usually longer than those of the = 0 component. The -dependent OAM decay is supported by a phenomenological model which takes into account the local nonuniformity of the exciton dephasing.

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“…There are interesting many-body effects to be incorporated in the optical processes in experiments such as four-wave mixing [29,30].…”

Section: Future Directionsmentioning

confidence: 99%

Optical Processes in Quantum Wells

Sham

1995

Acta Phys. Pol. A

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A review is given of the theoretical framework of exciton dynamics in quantum wells including the spin degrees of freedom. A study is made of various momentum, energy, and spin relaxation mechanisms including the effects of exciton-phonon interaction, the single-particle spin-flips by means of spin-orbit interaction and the exciton spin-ffip by means of the exchange interaction. All these competing mechanisms are taken into account in a set of equations governing the time evolution of the exciton spin populations. Solutions are then used to interpret observed time-resolved observations of polarized luminescence spectra. For excitons in a two-dimensional system such as a semiconductor quantum well, the breaking of the translational symmetry in the direction normal to the interface plane has been shown theoretically by Hanamura, by Andreani and Bassani, and by Citrin to result in a reckbination rate much faster than in a three-dimensional system. Yet, experiments show ckparable decay rates in two-and three-dimensional excitons. Recent experiments with high time resolutions show two decay times for the total luminescence intensity. The slower one agrees witl the one usually observed and interpreted as the radiative recombination time. We shall give an explanation for the fast decay as a ckbination of radiative recombination and single-particle spin-flip and for the slow decay as the radiative recombination slowed down by the presence of lower energy dark states for excitons with parallel spins. The ability to use the same theory to account for the polarization behavior confirms the importance of the exciton spin dynamics. Furthermore, the longitudinal electric field dependence is used to check our theory of exchange.

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Polarization-dependent picosecond excitonic nonlinearities and the complexities of disorder

Cited by 66 publications

References 18 publications

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
View full text Add to dashboard Cite

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
View full text Add to dashboard Cite

Coherent dynamics of exciton orbital angular momentum transferred by optical vortex pulses

Optical Processes in Quantum Wells

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Polarization-dependent picosecond excitonic nonlinearities and the complexities of disorder

Cited by 66 publications

References 18 publications

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−xWägner1, Schätz2, Maier3 et al. 1997Phys. Rev. B354110View full textAdd to dashboardCite

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−xWägner1, Schätz2, Maier3 et al. 1997Phys. Rev. B354110View full textAdd to dashboardCite

Coherent dynamics of exciton orbital angular momentum transferred by optical vortex pulses

Optical Processes in Quantum Wells

Contact Info

Product

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About

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
View full text Add to dashboard Cite

Coherent optical nonlinearities and phase relaxation of quasi-three-dimensional and quasi-two-dimensional excitons inZnSxSe1−x
Wägner
¹
,
Schätz
²
,
Maier
³

et al. 1997
Phys. Rev. B
35
4
11
0
View full text Add to dashboard Cite