Exciton dephasing in ZnSe quantum wires

Wägner, Hans; Langbein, Wolfgang Werner; Hvam, Jørn Märcher; Bacher, G.; Kümmell, T.; Forchel, A.

doi:10.1103/physrevb.57.1797

Cited by 26 publications

(22 citation statements)

References 34 publications

(28 reference statements)

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“…44͒ are used. We find a value of ␤ Xic (2D) ϭ4.7Ϯ1.4 for the incoherent exciton-exciton scattering process, which is comparable to the result of previous investigations on ZnS x Se 1Ϫx /ZnSe QW structures 32 and about twice the value found in GaAs QW's. …”

Section: Exciton-exciton Scatteringsupporting

confidence: 89%

“…This scattering parameter is significantly smaller than for quasi-3D and quasi-2D ZnSe structures (␤ ac Ϸ4-10 eV/K). 24,32 The weak acoustic-phonon interaction is attributed to the large well width, limiting the quasimomentum of the scattering phonons. A scattering rate inversely proportional to the well width is expected for the intrasubband scattering.…”

Section: ϫ2mentioning

confidence: 99%

“…25 Since wide-gap II-VI QW's possess a high exciton oscillator strength and a strong third-order nonlinearity, 26 they are well suited to study coherent transient phenomena by FWM. [19][20][21][27][28][29][30][31][32] Also, the high biexciton binding energy enables the spectral discrimination of the BIF contribution. 33,34 In this paper, we report on subpicosecond FWM studies on center-of-mass ͑COM͒ quantized excitons in wide ZnSe/Zn 0.94 Mg 0.06 Se single QW's ͑SQW's͒.…”

Section: Introductionmentioning

confidence: 99%

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Interaction and dephasing of center-of-mass quantized excitons in wideZnSe/Zn0.94

et al. 1998

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. Interaction and dephasing of center-of-mass quantized excitons in wide ZnSe/Zn0.94Mg0.06Se quantum wells. Physical Review B, 57(3), 1791-1796. DOI: 10.1103/PhysRevB.57.1791 Interaction and dephasing of center-of-mass quantized excitons in wide ZnSe/Zn 0. We investigate the interaction and dephasing of the excitons in wide ZnSe/Zn 0.94 Mg 0.06 Se quantum wells by spectrally resolved, femtosecond four-wave mixing ͑FWM͒. Polarization-dependent measurements indicate that excitation-induced dephasing is the dominant FWM process. The biexcitons of the center-of-mass quantized heavy and light hole excitons are observed, showing binding energies of 3.5 meV. We determine the exciton scattering cross sections with incoherent and coherent excitons. The coherent cross section is found to be larger than the incoherent cross section, which is attributed to a stronger Pauli repulsion for coherent excitons. The exciton interaction rates with acoustic and optical phonons are deduced by their temperature dependencies. The acoustic-phonon scattering is found to be strongly reduced in the investigated wide wells due to the reduced accessible phonon wave vector. ͓S0163-1829͑98͒00803-0͔

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Section: Exciton-exciton Scatteringsupporting

confidence: 89%

Section: ϫ2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Interaction and dephasing of center-of-mass quantized excitons in wideZnSe/Zn0.94

et al. 1998

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“…While this method has been widely applied to two-dimensional (2D) and bulk semiconductors, FWM experiments on epitaxially grown or etched quantum wires (QWRs) have proven to be challenging due to a reduced signal and strong Rayleigh scattering. Only a few groups reported on directional selective FWM in t-shaped GaAs QWRs 40 , in wet-chemical etched III-V [41][42][43] and II-VI QWRs [44][45][46] . The more advanced technique of heterodyne FWM (HFWM) 47 combines directionally selected FWM with a highly sensitive and selective heterodyne detection 48 providing sufficient suppression of the Rayleigh scattering background.…”

Section: Introductionmentioning

confidence: 99%

Population dynamics and dephasing of excitons and electron-hole pairs in polytype wurtzite/zinc-blende InP nanowires

et al. 2017

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“…Four-wave mixing ͑FWM͒ provides a powerful tool to study the fundamental coherent processes in low-dimensional II-VI semiconductor systems, as already shown in quasitwo-dimensional 19,20 and quasi-one-dimensional structures. 21 In this paper we study CdSe/ZnSe island structures by femtosecond transient FWM. The excitation-densitydependent dephasing of island excitons and the biexciton binding energy are investigated.…”

mentioning

confidence: 99%