论文标题
稀杂质对短石墨烯约瑟夫森连接的影响
Effect of dilute impurities on short graphene Josephson junctions
论文作者
论文摘要
我们研究了非磁杂质的稀释均匀空间分布对弹道石墨烯在短交界处持续的弹道石墨烯连接所维持的平衡超汇的影响。在Anderson模型的Dirac-Bogoliubov-De Gennes方法和建模杂质中，我们得出了超电流及其平衡功率谱。我们发现，通过降低了由无序引起的偏度以及临界电流的非单调温度依赖性，对电流相关的关系进行了修改。突出显示了杂交Andreev结合状态不一度光谱的准确光谱的超电流功率谱的潜力。在低温极限中，超电流零频率热噪声直接探测费米能量处的光谱函数。
We study the effect of a dilute homogeneous spatial distribution of non-magnetic impurities on the equilibrium supercurrent sustained by a ballistic graphene Josephson junction in the short junction limit. Within the Dirac-Bogoliubov-de Gennes approach and modeling impurities by the Anderson model we derive the supercurrent and its equilibrium power spectrum. We find a modification of the current-phase relation with a reduction of the skewness induced by disorder, and a nonmonotonic temperature dependence of the critical current. The potentialities of the supercurrent power spectrum for accurate spectroscopy of the hybridized Andreev bound states-impurities spectrum are highlighted. In the low temperature limit, the supercurrent zero frequency thermal noise directly probes the spectral function at the Fermi energy.
