Microcavity exciton-polariton mediated Raman scattering: Experiments and theory

Abstract

International audienceWe studied the intensity of resonant Raman scattering due to optical phonons in a planar II-VI-type semiconductor microcavity in the regime of strong coupling between light and matter. Two different sets of independent experiments were performed at near outgoing resonance with the middle polariton (MP) branch of the cavity. In the first, the Stokes-shifted photons were kept at exact resonance with the MP, varying the photonic or excitonic character of the polariton. In the second, only the incoming light wavelength was varied, and the resonant profile of the inelastic scattered intensity was studied when the system was tuned out of the resonant condition. Taking some matrix elements as free parameters, both independent experiments are quantitatively described by a model which incorporates lifetime effects in both excitons and photons, and the coupling of the cavity photons to the electron-hole continuum. The model is solved using a Green's function approach which treats the exciton-photon coupling nonperturbatively

Nonequilibrium dynamics of a singlet–triplet Anderson impurity near the quantum phase transition

“…Its extension to the lattice (or even the impurity model above the so-called coherence temperature) describes, among others, intermediate valence systems [1,2] and heavy fermions [3,4]. A bosonic version of it has been used to describe semiconductor microcavities with strong light-matter interaction [5,6]. The Kondo model is derived through a canonical transformation as an integer valence limit of the Anderson model [7].…”

Syntheses, Crystal and Band Structures, and Magnetic and Optical Properties of New CsLnCdTe3 (Ln = La, Pr, Nd, Sm, Gd−Tm, and Lu)

“…[26][27][28][29][30][31][32] To overcome these specific problems, two main approaches have been developed to synthesize desirable semiconductor materials: (1) By synthesizing nanoscale materials, the size of CdTe is reduced (e.g., quantum dots and quantum wells), which results in the change of their chemical and physical properties as compared with the bulk material; some examples include the increase of the band gap energy, the decrease of melting point, and the enhancement of photocatalytic properties. [33][34][35][36][37][38][39][40][41][42] This method can alter the energy gap by confining the particle size, which leads to the disruption of the 3D bonding networks in the bulk entity. [43][44][45][46] (2) Utilizing the chemical synthesis approaches, many new materials based on CdTe with main-group metals, 44,[46][47][48] transition metals, [49][50][51][52] and rare-earth metals 53,54 are designed and can exhibit various structural types and interesting optoelectronic and magnetic properties, which in some cases combine the properties of the corresponding binary phases.…”

“…Binary CdTe is an useful material that has been widely studied because of its possible applications as solar cells, − photovoltaic devices, − light-emitting diodes, − semiconductor detectors, − and thermoelectric materials. − Although CdTe has shown excellent performance as a solar cell material owing to its optimal energy gap, it also has some problems, such as a large absorption coefficient, native defects, electrical contacts, and highly rapid recombination of ions on the surface of CdTe homojunction, that reduce the efficiency of the solar cell. − To overcome these specific problems, two main approaches have been developed to synthesize desirable semiconductor materials: (1) By synthesizing nanoscale materials, the size of CdTe is reduced (e.g., quantum dots and quantum wells), which results in the change of their chemical and physical properties as compared with the bulk material; some examples include the increase of the band gap energy, the decrease of melting point, and the enhancement of photocatalytic properties. − This method can alter the energy gap by confining the particle size, which leads to the disruption of the 3D bonding networks in the bulk entity. − (2) Utilizing the chemical synthesis approaches, many new materials based on CdTe with main-group metals, ,− transition metals, − and rare-earth metals ...…”

Multiphonon Resonant Raman Scattering (MRRS) of Semiconductor Nanomaterials for Biodetection

“…In contrast, if not only electron cloud distortion but also nuclear motion is induced, energy changes of the scattered photon can be detected and an inelastic "Raman scattering" process happens. 31 Similar to molecules, Raman scattering in solid matter originates from the polarization fluctuation of the matter corresponding to some elementary excitations, such as phonon, 32 plasmon, 33 and magnon. 34 Figure 1 illustrates these basic processes including Rayleigh and Raman scattering.…”