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arXiv 1111.5916cond-mat.mtrl-sci
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子带间极化子的量子理论

Quantum theory of intersubband polarons

Simone De Liberato, Cristiano Ciuti

摘要:

本文提出了一个子带间极化子的微观量子理论,它是由子带间跃迁与纵向光学声子耦合而产生的准粒子。为了这个目的,我们开发了第二个量子化理论,同时考虑到声子和子带间跃迁之间的Fröhlich相互作用和子带间跃迁之间的库仑相互作用。我们的研究结果表明,声子和子带间跃迁之间的耦合是非常强烈的,这要归功于集体性质的子带间激发和自然的紧密限制的光学声子。耦合不仅强到足以在光谱上解决模式之间的共振分裂(强耦合区),而且它可以变得与激发的裸频率相当(超强耦合区)。因此,我们预测的可能性,利用子带间极化子的应用光电研究,在那里需要一个精确的控制的声子共振,也观察基本的量子真空物理,典型的超强耦合制度。

英文摘要:

We present a microscopic quantum theory of intersubband polarons, quasiparticles originated from the coupling between intersubband transitions and longitudinal optical phonons. To this aim we develop a second quantized theory taking into account both the Fröhlich interaction between phonons and intersubband transitions and the Coulomb interaction between the intersubband transitions themselves. Our results show that the coupling between the phonons and the intersubband transitions is extremely intense, thanks both to the collective nature of the intersubband excitations and to the natural tight confinement of optical phonons. Not only the coupling is strong enough to spectroscopically resolve the resonant splitting between the modes (strong coupling regime), but it can become comparable to the bare frequency of the excitations (ultrastrong coupling regime). We thus predict the possibility to exploit intersubband polarons both for applied optoelectronic research, where a precise control of the phonon resonances is needed, and also to observe fundamental quantum vacuum physics, typical of the ultrastrong coupling regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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