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arXiv 1503.01153cond-mat.mes-hall
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半导体微腔的多维相干光谱

Multidimensional Coherent Spectroscopy of a Semiconductor Microcavity

Brian L. Wilmer, Felix Passmann, Michael Gehl, Galina Khitrova, Alan D. Bristow

摘要:

再定相和非再定相二维相干谱映射了半导体微腔中与法向模分裂相关的反交叉。对于一个12 meV的失谐范围接近零失谐,它被观察到,有两个对角的功能相关的激子极化激元分支的内部行动和两个非对角的功能相关的极化激元之间的相干相互作用。在负失谐时,对角内作用特征的线形性质是可区分的,并且可以与类腔和类激子模式相关联。观察到的双激子伴侣功能,从激子功能的双激子结合能。更接近零失谐,所有的功能都得到增强,对角线内的作用功能变得几乎相等的幅度和线宽。在正失谐的激子和腔的特性返回到对角线内的行动功能。非对角相互作用特征在整个失谐范围内表现出其幅度的不对称性。的振幅强烈调制(和反转)在小的正失谐,作为较低的极化激元分支交叉的束缚双激子能量确定从负失谐光谱。

英文摘要:

Rephasing and non-rephasing two-dimensional coherent spectra map the anti-crossing associated with normal-mode splitting in a semiconductor microcavity. For a 12-meV detuning range near zero detuning, it is observed that there are two diagonal features related to the intra-action of exciton-polariton branches and two off-diagonal features related to coherent interaction between the polaritons. At negative detuning, the lineshape properties of the diagonal intra-action features are distinguishable and can be associated with cavity-like and exciton-like modes. A biexcitonic companion feature is observed, shifted from the exciton feature by the biexciton binding energy. Closer to zero detuning, all features are enhanced and the diagonal intra-action features become nearly equal in amplitude and linewidth. At positive detuning the exciton- and cavity-like characteristics return to the diagonal intra-action features. Off-diagonal interaction features exhibit asymmetry in their amplitudes throughout the detuning range. The amplitudes are strongly modulated (and invert) at small positive detuning, as the lower polariton branch crosses the bound biexciton energy determined from negative detuning spectra.

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