Coherent dynamics of localized excitons and trions in ZnO/(Zn,Mg)O quantum wells studied by photon echoes

Solovev, I. A.; Poltavtsev, S. V.; Kapitonov, Yu. V.; Акимов, И. А.; Sadofev, Sergey; Puls, J.; Yakovlev, D. R.; Bayer, М.

doi:10.1103/physrevb.97.245406

Cited by 11 publications

(6 citation statements)

References 28 publications

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“…The spectral behavior of the coherence time T 2 and the population decay time T 1 can be explained by the localization of excitons on the QW potential fluctua-tions. Qualitatively similar T 2 and T 1 spectra measured through photon echoes were acquired recently on negatively charged excitons (trions) in ZnO QWs: Both spectral dependences revealed at T = 1.5 K a monotonous increase with decreasing energy and the population decay lasted substantially longer than the trion dephasing (T 1 ≫ T 2 /2) [21].…”

Section: Discussionsupporting

confidence: 78%

“…The lowtemperature part of the temperature dependence of the decoherence rate can be approximated with a linear dependence Γ 2 = Γ 0 2 + γT . The slope γ = 0.8 µeV/K responsible for the exciton dephasing due to interaction with acoustic phonons is somewhat smaller than that observed recently in ZnO bulk and QWs (∼ 2 µeV/K) [19,21]. It can be concluded, however, that acoustic phonons strongly and unavoidably damp exciton coherence in (In,Ga)N/GaN QWs.…”

Section: Fwm Experimental Resultscontrasting

confidence: 54%

“…We found that the localized excitons in our MQW structure show a much longer coherent dynamics than it could be expected from previous micro-PL studies of (In,Ga)N/GaN QWs with higher indium concentrations. The exciton coherent life lasts up to 255 ps, which is substantially longer than typical coherence times of excitons localized in III-V QWs composed of GaAs/(Al,Ga)As [29], (In,Ga)As/GaAs [30], or in II-IV QWs such as CdTe/(Cd,Mg)Te [31] and ZnO/(Zn,Mg)O [21], where the typical coherence times are in the range of tens of ps. We also see that across the wide spectrum of localized states there is a strong correlation between the exciton localization energy and its coherence times, which differ by a factor of five between the lower and higher energy flanks of this line.…”

Section: Discussionmentioning

confidence: 95%

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Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells

et al. 2018

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We study the coherent dynamics of localized excitons in 100-periods of 2.5 nm thick (In,Ga)N/GaN quantum wells with 7.5% indium concentration, measured with spectroscopic resolution through two-pulse and three-pulse photon echoes at the temperature of 1.5 K. A long-lived coherent exciton dynamics is observed in the (In,Ga)N quantum wells: When the laser photon energy is tuned across the 43 meV-wide inhomogeneously broadened resonance line, the coherence time T2 varies between 45 and 255 ps, increasing with stronger exciton localization. The corresponding narrow homogeneous linewidths ranging from 5.2 to 29 µeV as well as the relatively weak exciton-phonon interaction (0.8 µeV/K) confirm a strong, quantum dot-like exciton localization in a static disordered potential inside the (In,Ga)N quantum well layers.

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Section: Discussionsupporting

confidence: 78%

Section: Fwm Experimental Resultscontrasting

confidence: 54%

Section: Discussionmentioning

confidence: 95%

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Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells

et al. 2018

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“…Among them, materials such as halide perovskites [27,28] or transition metal dichalcogenide monolayers [29][30][31][32][33][34] can be suggested. Additionally, wurtzite ZnO-based materials are of interest, for which robust coherent dynamics of the different optical transitions were recently observed though photon echoes [35,36]…”

Section: Discussionmentioning

confidence: 99%

Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells

Poltavtsev

Kapitonov

Yugova

et al. 2019

Sci Rep

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Coherent optical spectroscopy such as four-wave mixing and photon echo generation deliver rich information on the energy levels involved in optical transitions through the analysis of polarization of the coherent response. In semiconductors, it can be applied to distinguish between different exciton complexes, which is a highly non-trivial problem in optical spectroscopy. We develop a simple approach based on photon echo polarimetry, in which polar plots of the photon echo amplitude are measured as function of the angle φ between the linear polarizations of the two exciting pulses. The rosette-like polar plots reveal a distinct difference between the neutral and charged exciton (trion) optical transitions in semiconductor nanostructures. We demonstrate this experimentally by photon echo polarimetry of a CdTe/(Cd, Mg)Te quantum well. The echoes of the trion and donor-bound exciton are linearly polarized at the angle 2 φ with respect to the first pulse polarization and their amplitudes are weakly dependent on φ . While on the exciton the photon echo is co-polarized with the second exciting pulse and its amplitude scales as cos φ .

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“…The optical coherence could be addressed and stored in ensembles of resonant systems by the photon echo (PE) protocol, in the simplest cases realized by two (spontaneous PE) or three (stimulated PE) successive laser pulses exciting the ensemble [5][6][7][8]. An important step towards applications utilizing such coherence manipulation in the ultrafast way was the observation of PE from ensembles of excitons and their complexes in epitaxial heterostructures based on GaAs [9][10][11], CdTe [12][13][14][15], and wide-band gap ZnO [16,17] and GaN [18] semiconductors. PE is also actively studied in novel excitonic materials: transition metal dichalcogenide (TMDC) monolayers [19,20], and halide perovskites [21][22][23][24].…”

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confidence: 99%

Long-living dark coherence brought to light by magnetic-field controlled photon echo

Solovev,

Yanibekov,

Efimov

et al. 2020

Preprint

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Larmor precession of the quasiparticle spin about a transverse magnetic field leads to the oscillations in the spontaneous photon echo signal due to the shuffling of the optical coherence between optically accessible (bright) and inaccessible (dark) states. Here we report on a new non-oscillating photon echo regime observed in the presence of non-equal dephasing rates of bright and dark states. This regime enables the observation of the long-living dark optical coherence. As a simple mechanical analogy, we suggest a charged particle moving in the magnetic field through the medium with anisotropic viscous friction. We demonstrate the dark coherence retrieval in the spontaneous photon echo from excitons in the InGaAs/GaAs quantum well.

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Coherent dynamics of localized excitons and trions in ZnO/(Zn,Mg)O quantum wells studied by photon echoes

Cited by 11 publications

References 28 publications

Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells

Long coherent dynamics of localized excitons in (In,Ga)N/GaN quantum wells

Polarimetry of photon echo on charged and neutral excitons in semiconductor quantum wells

Long-living dark coherence brought to light by magnetic-field controlled photon echo

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