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首页> 外文期刊>Physica status solidi, B. Basic research >Transmission resonance induced by a δ-like defect in the Fano-Anderson model with two Fano defects
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Transmission resonance induced by a δ-like defect in the Fano-Anderson model with two Fano defects

机译：具有两个Fano缺陷的Fano-Anderson模型中的δ样缺陷引起的传输共振

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摘要

We study theoretically the propagation of waves in a discrete linear chain with two side-coupled Fano defects and one δ-like defect, using a modified Fano-Anderson model. Two separate cases, where the Fano defects are coupled to the chain by on-site coupling or by inter-site coupling, are considered. We find that the transmission behavior is very sensitive to whether the distance between the Fano defects and the δ-like defect, l, is even or odd. In the on-site coupling case, we find that for even values of l, the Fano-Feshbach resonance is sustained in the presence of a δ-like defect, but the position of the transmission peak is shifted and its shape becomes asymmetric. In the inter-site coupling case, the width of the asymmetric Fano resonance can be tuned by changing the coupling constants. When l is odd in the inter-site coupling case, we find that there exist two resonant transmissions in addition to the perfect reflection. In general, the δ-like defect strongly influences on the transmission resonance but does not alter the perfect reflection.
机译：我们使用改进的Fano-Anderson模型，从理论上研究了具有两个侧耦合Fano缺陷和一个δ类缺陷的离散线性链中波的传播。考虑两种单独的情况，其中通过现场耦合或通过站点间耦合将Fano缺陷耦合到链。我们发现，传输行为对Fano缺陷和类δ缺陷l之间的距离是偶数还是奇数非常敏感。在现场耦合的情况下，我们发现对于l的偶数，在存在类似δ缺陷的情况下，Fano-Feshbach共振得以维持，但是透射峰的位置发生了偏移，并且其形状变得不对称。在站点间耦合的情况下，可以通过更改耦合常数来调整非对称Fano共振的宽度。在站点间耦合的情况下，当l为奇数时，我们发现除了完美反射之外，还存在两个共振传输。通常，类δ缺陷会严重影响传输共振，但不会改变完美反射。

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