论文标题
可调的越过Andreev反射在由铁磁体，正常金属和超导体组成的异质结构中
Tunable crossed Andreev reflection in a heterostructure consisting of ferromagnets, normal metal and superconductors
论文作者
论文摘要
越过Andreev反射（CAR）是在两个正常金属（NM）铅系统中连接到超导体（SC）的系统中的一种非局部转运现象，该系统将一个金属铅中的电子像兴奋性转化为一个金属铅中的电子一样，像其他金属铅中的激励一样刺激。散射现象。电子隧道（ET），电子反射（ER）和Andreev反射（AR）与CAR竞争，并降低CAR的可能性一般。通过抑制ET和AR，使用实验意识到的观察CAR的建议之一是在与SC相连的反平行构型中采用两个铁磁（FM）。但是在此设置中无法调整汽车概率。我们提出了一个由栅极可调节的NM区域组成的设置，该设置连接到两侧的两个超导区域，这些区域连接到FM的导线，以反平行的配置更远，其中可以将汽车和ER的概率从$ 0 $ $ 1 $更改为$ 1 $，通过更改栅极电压应用于NM NM区域。应用于NM区域的栅极电压决定了NM区域的化学电位，并在NM区域对电子和孔模式的Fabry-Pérot干扰提供了手柄。我们计算拟议的设置的差分thrcectionconconctuctance，该设置可以在$ 0 $至$ -e^2/h $的范围内调整。
Crossed Andreev reflection (CAR) is a nonlocal transport phenomenon in a system of two normal metal (NM) leads connected to a superconductor (SC) that converts the electron like excitations in one metallic lead into hole like excitations in the other metallic lead. The scattering phenomena viz. electron tunneling (ET), electron reflection (ER) and Andreev reflection (AR) compete with CAR and reduce the probability of CAR generically. One of the experimentally realized proposals to observe CAR is to employ two ferromagnetic (FM) leads in antiparallel configuration connected to the SC by suppressing ET and AR. But CAR probability cannot be tuned in this setup. We propose a setup consisting of a gate tunable NM region connected to two superconducting regions on either side which are connected to FM leads further away in antiparallel configuration, in which probabilities of CAR and ER can be changed from $0$ to $1$ by a changing the gate voltage applied to the NM region. The gate voltage applied to the NM region dictates the chemical potential of the NM region and gives a handle on the Fabry-Pérot interference of the electron and hole modes in the NM region. We calculate differential transconductance for the proposed setup which can be tuned across the range $0$ to $-e^2/h$.
