Light Propagation- and Many-particle-induced Non-Lorentzian Lineshapes in Semiconductor Nanooptics

Förstner, Jens; Ahn, Kwang Jun; Danckwerts, J.; Schaarschmidt, Martin; Waldmüller, I.; Weber, Carsten; Knorr, Andreas

doi:10.1002/1521-3951(200211)234:1<155::aid-pssb155>3.0.co;2-r

Cited by 27 publications

(9 citation statements)

References 31 publications

(39 reference statements)

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“…12,13 The decay time of this superradiant response inversely scales with the QW number N. The reflection from MQW Bragg structures is characterized by a Lorentzian line which grows in peak reflectivity and linewidth with increasing N. 14 In the limit of large N, the reflectivity reaches unity and a square profile characteristic for the reflection of a photonic band gap is formed. 15 Time-resolved reflection experiments and microscopic calculations have shown enhanced emission along with accelerated decay of the coherent optical polarization. 16 At higher excitation intensities, the radiative coupling gradually disappeared, which was attributed to excitation-induced dephasing due to carriercarrier interaction in the individual QWs.…”

Section: Introductionmentioning

confidence: 99%

Linear and nonlinear pulse propagation in a multiple-quantum-well photonic crystal

et al. 2004

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We investigate the temporal and spectral properties of subpicosecond pulses transmitted on the heavy-hole exciton transition through a multiple-quantum-well Bragg structure, exhibiting a one-dimensional photonic band gap. At low light intensities, a temporal propagation beating is observed. This beating is strongly dependent on the optical dephasing time T 2 which is dominated by the radiative interwell coupling. In an intermediate intensity regime, the Pauli-blocking nonlinearity leads to gradual suppression of the photonic band gap and vanishing of the linear propagation beating. For highly nonlinear excitation, we find signatures of selfinduced transmission due to Rabi flopping and adiabatic following of the carrier density. Numerical simulations using the semiconductor Maxwell-Bloch equations are in excellent agreement with the experimental data up to intensities for which higher many-particle correlations become more important and self-phase modulation occurs in the sample substrate.

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Section: Introductionmentioning

confidence: 99%

Linear and nonlinear pulse propagation in a multiple-quantum-well photonic crystal

et al. 2004

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“…Contrary to light emission in Figure , the high-energy side of the excitonic resonance is more pronounced in absorption. This is because the phonon creation processes appear at higher energies in absorption . For the light emission spectra, this broadening appears on the low-energy side, because of its photon-emission character (see Supporting Information Figure S4).…”

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Strain Control of Exciton–Phonon Coupling in Atomically Thin Semiconductors

et al. 2018

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Semiconducting transition metal dichalcogenide (TMDC) monolayers have exceptional physical properties. They show bright photoluminescence due to their unique band structure and absorb more than 10% of the light at their excitonic resonances despite their atomic thickness. At room temperature, the width of the exciton transitions is governed by the exciton-phonon interaction leading to strongly asymmetric line shapes. TMDC monolayers are also extremely flexible, sustaining mechanical strain of about 10% without breaking. The excitonic properties strongly depend on strain. For example, exciton energies of TMDC monolayers significantly redshift under uniaxial tensile strain. Here, we demonstrate that the width and the asymmetric line shape of excitonic resonances in TMDC monolayers can be controlled with applied strain. We measure photoluminescence and absorption spectra of the A exciton in monolayer MoSe, WSe, WS, and MoS under uniaxial tensile strain. We find that the A exciton substantially narrows and becomes more symmetric for the selenium-based monolayer materials, while no change is observed for atomically thin WS. For MoS monolayers, the line width increases. These effects are due to a modified exciton-phonon coupling at increasing strain levels because of changes in the electronic band structure of the respective monolayer materials. This interpretation based on steady-state experiments is corroborated by time-resolved photoluminescence measurements. Our results demonstrate that moderate strain values on the order of only 1% are already sufficient to globally tune the exciton-phonon interaction in TMDC monolayers and hold the promise for controlling the coupling on the nanoscale.

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“…We find a polaron red-shift of approximately 29 meV with respect to the unshifted exciton main line (gray). Furthermore, the spectrum exhibits asymmetric phonon sidebands, in particular at the high-energy side of the main resonance [30][31][32] . Subtracting the homogeneous linewidth shows that we observe multiple sidebands above the main resonance originating from emission and absorption of acoustic and optical phonons, inset: Fig.…”

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Phonon Sidebands in Monolayer Transition Metal Dichalcogenides

et al. 2017

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Excitons dominate the optical properties of monolayer transition metal dichalcogenides (TMDs). Besides optically accessible bright exciton states, TMDs exhibit also a multitude of optically forbidden dark excitons. Here, we show that efficient exciton-phonon scattering couples bright and dark states and gives rise to an asymmetric excitonic line shape. The observed asymmetry can be traced back to phonon-induced sidebands that are accompanied by a polaron redshift. We present a joint theory-experiment study investigating the microscopic origin of these sidebands in different TMD materials taking into account intra- and intervalley scattering channels opened by optical and acoustic phonons. The gained insights contribute to a better understanding of the optical fingerprint of these technologically promising nanomaterials.

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Light Propagation- and Many-particle-induced Non-Lorentzian Lineshapes in Semiconductor Nanooptics

Cited by 27 publications

References 31 publications

Linear and nonlinear pulse propagation in a multiple-quantum-well photonic crystal

Linear and nonlinear pulse propagation in a multiple-quantum-well photonic crystal

Strain Control of Exciton–Phonon Coupling in Atomically Thin Semiconductors

Phonon Sidebands in Monolayer Transition Metal Dichalcogenides

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