论文标题
时间依赖于Andreev反射
Time-dependent Andreev reflection
论文作者
论文摘要
我们将Andreev反射（AR）的基本理论扩展到正常的金属/超导体结中，以跨交界处使用任意时间依赖时间依赖性偏置电压$ V（t）$的情况。该理论的核心要素是，AR振幅的傅立叶变换具有休闲结构。例如，该理论用于描述当前对偏置电压短脉冲的响应，这些反应产生了具有不同能量的准粒子状态的连贯叠加。当前的及时振荡，带有差距频率$δ/\ hbar $，也是脉冲面积$ \ int v（t）dt $的函数，并带有单电子通量量子$ e/h $的周期。
We extend the basic theory of Andreev reflection (AR) in a normal metal/superconductor junction to the situation with an arbitrary time-dependent bias voltage $V(t)$ across the junction. The central element of the theory is the fact that the Fourier transform of the AR amplitude has a casual structure. As an example, the theory is used to describe the current response to short pulses of the bias voltage, which create coherent superposition of quasiparticle states with different energies. The current oscillates in time, with the gap frequency $Δ/\hbar$, and also as a function of the pulse area $\int V(t)dt$, with the period of the single-electron flux quantum $e/h$.
