论文标题
超导点接触的非球形传输特性
Non-ballistic transport characteristics of superconducting point-contacts
论文作者
论文摘要
在“弹道”制度中，跨正常金属（N）/超导体触发器的运输以称为Andreev反射的量子过程为主导。 Andreev反射会导致超导能量差距以下电导的增强，而当超导体是常规的本质上时，低偏差和高偏置电导的比率不能大于2。在此制度中，与Andreev反射相关的特征还提供了有关超导阶段的能量和动量分辨的光谱信息。从理论上讲，我们在这里考虑了各种类型的N/S点触点，远离弹道性机构，并表明，即使调查的超导体在本质上很简单，具体取决于点触点的形状，大小和解剖学，电导光谱中也会出现各种光谱特征。这种特征可能会误导地模仿外来物理现象的理论上预期的特征，例如拓扑超导体中的klein隧道，在非常规超导体，多体超导性和majoraana零模式下，安德里·雷夫（Andreev）绑定的状态。
In the "ballistic" regime, the transport across a normal metal (N)/superconductor (S) point-contact is dominated by a quantum process called Andreev reflection. Andreev reflection causes an enhancement of the conductance below the superconducting energy gap, and the ratio of the low-bias and the high-bias conductance cannot be greater than 2 when the superconductor is conventional in nature. In this regime, the features associated with Andreev reflection also provide energy and momentum-resolved spectroscopic information about the superconducting phase. Here we theoretically consider various types of N/S point contacts, away from the ballistic regime, and show that even when the superconductor under investigation is simple conventional in nature, depending on the shape, size and anatomy of the point contacts, a wide variety of spectral features may appear in the conductance spectra. Such features may misleadingly mimic theoretically expected signatures of exotic physical phenomena like Klein tunneling in topological superconductors, Andreev bound states in unconventional superconductors, multiband superconductivity and Majorana zero modes.
