Gate controlled coupling of intersubband plasmons
Gate controlled coupling of intersubband plasmons
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子带间等离子体激元的门控耦合
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
C. Sirtori
中科院分区：
文献类型：
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作者：
A. Delteil;A. Vasanelli;Y. Todorov;B. Paulillo;G. Biasiol;L. Sorba;C. Sirtori
研究了具有两个已占据子带的重掺杂量子阱的光学响应与电子密度的关系。结果表明，两种光活性跃迁通过偶极-偶极-库仑相互作用相互耦合，使它们的吸收振幅强烈地重整化。为了证明这种效应，我们在一个可以通过施加栅极电压来调节电子密度的装置上测量了一组光谱。我们的结果表明，只有考虑两个跃迁之间的库仑耦合才能正确地描述吸收光谱。因此，子带间跃迁产生的光偶极子不是独立的，而是具有可调强度的耦合振荡器。
The optical response of a heavily doped quantum well, with two occupied subbands, has been investigated as a function of the electronic density. It is shown that the two optically active transitions are mutually coupled by dipole-dipole Coulomb interaction, which strongly renormalizes their absorption amplitude. In order to demonstrate this effect, we have measured a set of optical spectra on a device in which the electronic density can be tuned by the application of a gate voltage. Our results show that the absorption spectra can be correctly described only by taking into account the Coulomb coupling between the two transitions. As a consequence, the optical dipoles originating from intersubband transitions are not independent, but rather coupled oscillators with an adjustable strength.