论文标题
Higgs模式的签名通过正常水平的运输 - 超导连接
Signatures of the Higgs mode in transport through a normal-metal--superconductor junction
论文作者
论文摘要
在Terahertz范围内接受电磁辐射的超导体可以显示其顺序参数的振幅振荡。但是，众所周知，将这种所谓的希格斯模式耦合到电荷电流非常困难。我们建议使用DC - 电压偏置的正常水平 - 垂体隧道隧道连接在颗粒 - 孔 - 空气对称构型中实现这种耦合。使用准经典绿色的功能形式主义，我们演示了HIGGS模式的三个特征签名：（i）AC电荷电流表现出明显的谐振行为，并且当辐射频率与顺序参数重合时是最大的。 （ii）AC电荷电流幅度表现出特征性的非单调行为，并且电压偏置增加。 （iii）在共振的大电压偏置时，交流电流与偏置成反比。这些特征为HIGGS模式提供了电气检测方案。
A superconductor subject to electromagnetic irradiation in the terahertz range can show amplitude oscillations of its order parameter. However, coupling this so-called Higgs mode to the charge current is notoriously difficult. We propose to achieve such a coupling in a particle-hole-asymmetric configuration using a DC-voltage-biased normal-metal--superconductor tunnel junction. Using the quasiclassical Green's function formalism, we demonstrate three characteristic signatures of the Higgs mode: (i) The AC charge current exhibits a pronounced resonant behavior and is maximal when the radiation frequency coincides with the order parameter. (ii) The AC charge current amplitude exhibits a characteristic nonmonotonic behavior with increasing voltage bias. (iii) At resonance for large voltage bias, the AC current vanishes inversely proportional to the bias. These signatures provide an electric detection scheme for the Higgs mode.
