论文标题
Andreev绑定的状态在Infinite-U极限处的超导体 - Quantum dot Josephson连接
Andreev bound states in Superconductor-quantum dot Josephson junction at infinite-U limit
论文作者
论文摘要
Andreev绑定的状态（ABSS）以量子点（ABS）为基础，该量子点与常规BCS超导铅耦合，基于有效的从属玻色子Hamiltonian在Infinite-U（Coulomb相互作用）极限的限制中，然后是Green的功能技术。从相关的绿色功能中，在不同的超导相差异下分析状态密度（DOS）。基于数值计算，它是从ABS（亚间隙状态）的DOS图指出的，这是由于左右超导导线之间的相差而产生的。由于对超导相位差的依赖，ABS是当前的携带状态。我们还分析了ABS的能量作为电子孔对称的左右超导铅之间的相位差的函数，以及在各种点铅耦合强度下的非对称情况。还可以指出，在没有电子孔或左右对称性的情况下，上下安德里弗斯结合状态之间出现有限的内部差距。根据现有的理论分析，可以查看这些结果。
Andreev bound states (ABSs) are studied in quantum dot coupled to conventional BCS superconducting leads on the basis of effective slave boson Hamiltonian in an infinite-U (Coulomb interaction) limit followed by Green's function technique. From the relevant Green's function, density of states (DOS) is analyzed at different superconducting phase differences. On the basis of numerical computation, it is pointed out from DOS plot that ABSs (sub-gap states) arise due to the phase difference between left and right superconducting leads. Due to the dependence on superconducting phase difference, ABSs are current carrying states. We have also analyzed the energy of ABSs as a function of phase difference between left and right superconducting lead for electron hole symmetric as well as non symmetric cases at various dot-lead coupling strengths. It is also pointed out that a finite internal gap arises between upper and lower Andreev bound states in the absence of electron-hole or left-right symmetry. These results are viewed in the light of existing theoretical analysis.
