Mechanism of excitonic dephasing in layered InSe crystals

Dey, Prasenjit; Paul, Jeffrey; Glikin, Neil; Kovalyuk, Z. D.; Kudrynskyi, Z. R.; Romero, Aldo H.; Karaiskaj, D.

doi:10.1103/physrevb.89.125128

Cited by 34 publications

(48 citation statements)

References 47 publications

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“…A strong enhancement of the exciton response in TFWM is observed, and the 2DFTS results indicate separate contributions to the exciton signal tied to degenerate and nondegenerate many-body interactions, consistent with previous reports 10,14,23,24 . The real part of the rephasing 2DFTS signal reveals a rich dispersive structure that was not evident in earlier 2DFTS studies of the exciton-continuum coupling because only the amplitude spectra were detected 14,47 or the signal was measured over a narrower range of energies 15,22 .…”

Section: Introductionsupporting

confidence: 78%

Signatures of four-particle correlations associated with exciton-carrier interactions in coherent spectroscopy on bulk GaAs

et al. 2016

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Transient four-wave mixing studies of bulk GaAs under conditions of broad bandwidth excitation of primarily interband transitions have enabled four-particle correlations tied to degenerate (exciton-exciton) and nondegenerate (exciton-carrier) interactions to be studied. Real twodimensional Fourier-transform spectroscopy (2DFTS) spectra reveal a complex response at the heavy-hole exciton emission energy that varies with the absorption energy, ranging from dispersive on the diagonal, through absorptive for low-energy interband transitions to dispersive with the opposite sign for interband transitions high above band gap. Simulations using a multilevel model augmented by many-body effects provide excellent agreement with the 2DFTS experiments and indicate that excitation-induced dephasing (EID) and excitation-induced shift (EIS) affect degenerate and nondegenerate interactions equivalently, with stronger exciton-carrier coupling relative to exciton-exciton coupling by approximately an order of magnitude. These simulations also indicate that EID effects are three times stronger than EIS in contributing to the coherent response of the semiconductor.

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Section: Introductionsupporting

confidence: 78%

Signatures of four-particle correlations associated with exciton-carrier interactions in coherent spectroscopy on bulk GaAs

et al. 2016

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“…A fit to the data yields γ = 60 µeV K −1 , which is nearly an order of magnitude larger compared to conventional semiconductor quantum wells 57,58 and is a factor of two larger than excitons in bulk TMD InSe. 59 Extrapolated to zero density and zero temperature, the exciton homogeneous linewidth is γ 0 (0) = 1.6 meV (T 2 = 410 fs).…”

Section: Resultsmentioning

confidence: 99%

Coherent quantum dynamics of excitons in monolayer transition metal dichalcogenides

et al. 2016

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Transition metal dichalcogenides (TMDs) have garnered considerable interest in recent years owing to their layer thickness-dependent optoelectronic properties. In monolayer TMDs, the large carrier effective masses, strong quantum confinement, and reduced dielectric screening lead to pronounced exciton resonances with remarkably large binding energies and coupled spin and valley degrees of freedom (valley excitons). Coherent control of valley excitons for atomically thin optoelectronics and valleytronics requires understanding and quantifying sources of exciton decoherence. In this work, we reveal how exciton-exciton and exciton-phonon scattering influence the coherent quantum dynamics of valley excitons in monolayer TMDs, specifically tungsten diselenide (WSe 2 ), using two-dimensional coherent spectroscopy. Excitation-density and temperature dependent measurements of the homogeneous linewidth (inversely proportional to the optical coherence time) reveal that exciton-exciton and exciton-phonon interactions are significantly stronger compared to quasi-2D quantum wells and 3D bulk materials. The residual homogeneous linewidth extrapolated to zero excitation density and temperature is ∼ 1.6 meV (equivalent to a coherence time of 0.4 ps), which is limited only by the population recombination lifetime in this sample.

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“…In the φp photoproduction channel, an unexpected narrow peak is observed in the vicinity of the almost degenerate K * Λ g.s. and K + Λ(1520) thresholds [24][25][26]. And, finally, a dip structure was found 2 in the meson sector also meson-meson at the K * Σ threshold in K 0 s Σ + photoproduction off the proton, which is particularly pronounced at forward directions [27].…”

Section: Introductionmentioning

confidence: 99%

Photoproduction of Mesons

Schmieden

Клейн

2017

EPJ Web Conf.

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Abstract. B.1 is one of the experimental projects within the CRC 16. It aims at the systematic investigation of the photoproduction of mesons off nucleons in order to understand reaction mechanisms and the relevant degrees of freedom in resonance formation. Of particular interest is the photoproduction of mesons heavier than the pion and resonances involving hidden or open strangeness. Essential hardware contributions have been made to the experimental programme of the CRC 16 through tagging systems, and photon-beam polarisation and polarimetry. A new experiment has been set up within the framework of the BGO-OD collaboration. This combines a forward magnetic spectrometer with a central BGO calorimeter with charged particle recognition and identification. The BGO-OD experiment enables reconstruction of complex final states composed of both charged and neutral particles, complementary to the existing CBELSA/TAPS calorimeter which is optimised for multi-photon final states. Selected results of the 12-year CRC period are presented from both experiments.

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Mechanism of excitonic dephasing in layered InSe crystals

Cited by 34 publications

References 47 publications

Signatures of four-particle correlations associated with exciton-carrier interactions in coherent spectroscopy on bulk GaAs

Signatures of four-particle correlations associated with exciton-carrier interactions in coherent spectroscopy on bulk GaAs

Coherent quantum dynamics of excitons in monolayer transition metal dichalcogenides

Photoproduction of Mesons

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