Subharmonic gap structure in d-wave superconductors
Subharmonic gap structure in d-wave superconductors
复制标题
DOI：
10.1103/physrevb.65.220510
复制
发表时间：
2002-03
影响因子：
3.7
通讯作者：
A. Poenicke;J. Cuevas;M. Fogelstrom
中科院分区：
文献类型：
--
作者：
A. Poenicke;J. Cuevas;M. Fogelstrom
我们提出了一个自洽理论的电流-电压特性的d-波/d-波接触在任意透明度。特别是，我们解决了开放的问题，观察亚谐波间隙结构（SGS）在铜酸盐结。我们的分析表明：（i）SGS是可能的d波超导体;（ii）的存在下，差距的束缚态的SGS中的奇偶效应的结果;（iii）弹性散射机制，如杂质或表面粗糙度，可能会抑制SGS;和（iv）在磁场的存在下，安德烈耶夫猎犬状态的多普勒频移导致分裂的SGS。这是d波超导性的明确指纹。
We present a self-consistent theory of current-voltage characteristics of d-wave/d-wave contacts at arbitrary transparency. In particular, we address the open problem of the observation of subharmonic gap structure (SGS) in cuprate junctions. Our analysis shows that (i) the SGS is possible in d-wave superconductors; (ii) the existence of bound states within the gap results in an even-odd effect in the SGS; (iii) elastic scattering mechanisms, like impurities or surface roughness, may suppress the SGS; and (iv) in the presence of a magnetic field the Doppler shift of the Andreev hound states leads to a splitting of the SGS. which is an unambiguous fingerprint of d-wave superconductivity.