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arXiv quant-ph/0306164quant-phcond-mat.otherphysics.chem-ph
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非微扰相干布居俘获:一个分析模型

Nonperturbative Coherent Population Trapping: An Analytic Model

V. Delgado, J. M. Gomez Llorente

摘要:

相干布居俘获发生在驱动对称双势阱中的强场制度。系统参数已被选择,以再现氨分子的反转模式的$0^{-}\leftrightarrow 3^{+}$跃迁。对于一个最初以较低的二重态制备的分子,我们发现,在某些情况下,$3^{+}$能级保持未布居,尽管激光场与$0^{-}\leftrightarrow 3^{+}$跃迁共振,并且强度足以使$0^{+}$和$0^{-}$基态强烈混合,但这种情况仍然发生。这个违反直觉的结果构成了一种非微扰起源的相干布居捕获现象,这种现象不能用通常的模型来解释。我们提出了一个分析的非微扰模型,该模型正确地解释了所观察到的现象。

英文摘要:

Coherent population trapping is shown to occur in a driven symmetric double-well potential in the strong-field regime. The system parameters have been chosen to reproduce the $0^{-}\leftrightarrow 3^{+}$ transition of the inversion mode of the ammonia molecule. For a molecule initially prepared in its lower doublet we find that, under certain circumstances, the $3^{+}$ level remains unpopulated, and this occurs in spite of the fact that the laser field is resonant with the $0^{-}\leftrightarrow 3^{+}$ transition and intense enough so as to strongly mix the $0^{+}$ and $0^{-}$ ground states. This counterintuitive result constitutes a coherent population trapping phenomenon of nonperturbative origin which cannot be accounted for with the usual models. We propose an analytic nonperturbative model which accounts correctly for the observed phenomenon.

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