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Anti‐crossing of organic exciton and photon modes and a room temperature Rabi splitting that is an order of magnitude larger than the highest values reported for inorganic semiconductor quantum wells are observed in organic microcavity embedded quantum wells. Also, this larger splitting due to the large oscillator strength of organic excitons is easily achieved with many organic systems and gives reasonable hope for reaching the strong coupling regime. However, dynamic condensation clearly involving stimulated emission of the k ≈ 0 lower polaritons is expected at relatively low exciton density, due to the very small polariton mass. We report on the theoretical study of non‐linear emission of organic microcavity polaritons. In the ‘Boser’ model at low density, we include the acoustic phonon‐assisted relaxation and polariton–polariton scattering stimulated by the quasi‐bosonic polariton final state population. 相似文献
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This work presents the first continuum shell-model study of weakly bound neutron-rich nuclei involving multiconfiguration mixing. For the single-particle basis, the complex-energy Berggren ensemble representing the bound single-particle states, narrow resonances, and the nonresonant continuum background is taken. Our shell-model Hamiltonian consists of a one-body finite potential and a zero-range residual two-body interaction. It is demonstrated that the residual interaction coupling to the particle continuum is important; in some cases, it can give rise to the binding of a nucleus. 相似文献
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We investigate theoretically the optical properties of composite organic–inorganic semiconductor quantum wells. These properties are dominated by hybrid Frenkel (or charge-transfer) and Wannier–Mott excitonic states. An important effect is the possibility of using the Stark shift to tune the resonance between Frenkel and Wannier–Mott excitons. This fact is very important from a practical point of view because it may be difficult to grow such a structure exactly at resonance. We also discussed the coupling of Frenkel or charge transfer and Wannier–Mott exciton through a microcavity photon. We evaluate the hybrid exciton-polariton Rabi splitting. In the strong coupling regime the Rabi splitting depends essentially on the oscillator strength of the Frenkel or charge-transfer exciton. 相似文献
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H.?Eleuch N.?Ben?NessibEmail author R.?Bennaceur 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2004,29(3):391-395
We present, in this work a simple analytical expression of line emission in weakly non ideal plasma using a simplified quantum model. This formalism allows to explain the variations of the line widths with the density in a weakly non ideal plasma. We apply this model to plasma neutral helium lines HeI 6678 Å and HeI 5876 Å and explain the non linearity of the line width.Received: 17 January 2004, Published online: 4 May 2004PACS:
32.70.Jz Line shapes, widths, and shifts - 31.15.Lc Quasiparticle methods - 42.50.-p Quantum optics 相似文献
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A. Ben Ali M. Héritier S. Charfi-Kaddour R. Bennaceur 《The European Physical Journal B - Condensed Matter and Complex Systems》2000,14(1):53-61
A model of quasi-two-dimensional d-wave superconductor, with strong nesting properties of the Fermi surface is considered. The orbital effect of a moderate
magnetic field applied perpendicularly to the conducting planes is studied in the mean field approximation. It is shown that
the field can induce a time reversal symmetry breaking SDW order coexisting with the superconducting order and can open a
gap over the whole Fermi surface. The anomalies recently observed in the heat conductivity in might be ascribed to this effect.
Received 7 May 1999 and Received in final form 13 August 1999 相似文献
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Jichen Zhang Dr. Zhiyong Wang Salima Bennaceur Prof. Xianbo Jin 《Angewandte Chemie (International ed. in English)》2023,62(19):e202301479
The carbon to CaC2 route is promising to provide a sustainable elementary unit, C2H2, for the organic synthesis industry, but the traditional thermal reaction process suffers from low carbon efficiency, harmful gas contamination, high temperature operation, and risky CO management. We herein report a high carbon efficiency (ca. 100 %) conversion of biochar to C2H2 through an electrolytic synthesis of solid CaC2 in molten CaCl2/KCl/CaO at 973 K. The main reactions are carbon reduction to CaC2 at the solid carbon cathode and oxygen evolution at an inert anode. Meanwhile, the electrolysis removes S and P from the solid cathode, avoiding the formation of CaS and Ca3P2 in CaC2 and consequently eliminating H2S and PH3 contamination in the finally produced C2H2. 相似文献
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Using the Hubbard model in the weak coupling limit within a Fermi liquid approach, we have studied spin fluctuation effects in quasi‐2D superconductors such as high critical temperature superconductors. We show that, due to nesting properties of the Fermi surface, the magnetic and the transport properties are different from the behaviours we should observe in usual metal, because of strong magnetic fluctuation effect. We distinguish different regions in the normal state with different dependences as a function of temperature for several properties, such as the resistivity, NMR relaxation rate and spin susceptibility. We show that the pseudo‐gap region is strongly related to the existence of a pseudo‐gap in the density of states at the Fermi level. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献