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arXiv 1609.02800cond-mat.mes-hall
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隧道结等离子体发光的动态库仑阻塞理论

Dynamical Coulomb blockade theory of plasmon-mediated light emission from a tunnel junction

Fei Xu, Cecilia Holmqvist, Gianluca Rastelli, Wolfgang Belzig

摘要:

电子的非弹性隧穿可以产生光子的发射,光子的能量直观地受到所施加的偏置电压的限制。然而,实验表明,涉及电子与等离子体激元的相互作用的更复杂的过程导致具有过偏压能量的光子发射。我们最近在Phys.Rev.Lett中提出了这种观察的模型。\textbf{113},066801(2014),类似于最初为处理介观电路中的电磁环境而开发的动态库仑阻塞。该模型描述了两个电子与局部等离子体极化激元模式相互作用的相关隧穿,由谐振电路表示,并表明过偏压发射是由于非高斯波动。在这里,我们扩展我们的模型来研究在有限温度下的过偏压发射。我们发现,热拖尾强烈掩盖了过偏压发射。因此,相关隧穿过程的检测需要远低于偏置能量$eV$和等离子体激元能量$\hbarω_0$的温度$k_BT$,该条件幸运地通过实验实现。

英文摘要:

Inelastic tunneling of electrons can generate the emission of photons with energies intuitively limited by the applied bias voltage. However, experiments indicate that more complex processes involving the interaction of electrons with plasmon polaritons lead to photon emission with overbias energies. We recently proposed a model of this observation in Phys. Rev. Lett. \textbf{113}, 066801 (2014), in analogy to the dynamical Coulomb blockade, originally developed for treating the electromagnetic environment in mesoscopic circuits. This model describes the correlated tunneling of two electrons interacting with a local plasmon-polariton mode, represented by a resonant circuit, and shows that the overbias emission is due to the non-Gaussian fluctuations. Here we extend our model to study the overbias emission at finite temperature. We find that the thermal smearing strongly masks the overbias emission. Hence, the detection of the correlated tunneling processes requires temperatures $k_BT$ much lower than the bias energy $eV$ and the plasmon energy $\hbarω_0$, a condition which is fortunately realized experimentally.

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