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首页> 外文会议>Conference on Ultrafast Phenomena in Semiconductors and Nanostructure Materials; 20080120-23; San Jose,CA(US) >Novel exact approach to polariton-polariton interactions and scattering rates: the limits of bosonization
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Novel exact approach to polariton-polariton interactions and scattering rates: the limits of bosonization

机译：极化子-极化子相互作用和散射速率的新颖精确方法：玻化作用的极限

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摘要

We present a novel theory of polaritons which contains the crucial tools to securely tackle the many-body physics of polaritons. Microcavity polaritons are central to exciting Bose-Einstein condensation and parametric scattering experiments in semiconductors. Besides Coulomb and Pauli scattering (dressed by the relevant exciton-Hopfield coefficients), it beautifully unravels a novel fundamental scattering between two polaritons which can be physically associated with a photon-assisted exchange process, without any Coulomb contribution. The non-trivial consequences of the polariton composite nature - here treated exactly - lead to results noticeably different from the ones of the conventional approaches in which polaritons are mapped into elementary bosons. As an example we compute the scattering rate of two pump polaritons in a typical stimulated scattering experiment. To evaluate the limits of bosonization techniques we also compare qualitatively and quantitatively the scattering rate obtained through the main bosonized approach used up to now in the field to the exact result, and show in particular that unphysical spurious terms appear with bosonization.
机译：我们提出了一种新颖的极化子理论，其中包含了关键性工具，可以安全地解决极化子的多体物理问题。微腔极化子对于激发Bose-Einstein凝聚和半导体中的参数散射实验至关重要。除了库仑和保利散射（由相关激子-霍普菲尔德系数进行修正）之外，它还很好地揭示了两个极化子之间的新型基本散射，该散射可以与光子辅助交换过程进行物理关联，而没有任何库仑贡献。极化子复合性质的非平凡后果-在此进行了精确处理-导致结果明显不同于将极化子映射到基本玻色子的传统方法。例如，我们在一个典型的受激散射实验中计算两个泵浦极化子的散射率。为了评估玻化技术的局限性，我们还定性和定量地比较了本领域迄今为止使用的主要玻化方法获得的散射率与确切结果，并特别表明了在玻化过程中出现了非物理的杂散项。

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