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半导体/磁性d波超导隧道结中的散粒噪声
Shot noise in the semiconductor/ferromagnetic d-wave superconductor tunnel junction
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摘要: 考虑到磁性d波超导体中的能隙与磁交换能的依赖关系,通过求解Bogoliubov-de Gennes(BdG)方程,利用Blonder-Tinkham-Klapwijk理论方法研究半导体/磁性d波超导隧道结中的散粒噪声.计算结果表明:磁性d波超导结中的磁交换能h_0可导致散粒噪声在零偏压处的双峰和能隙处的峰出现劈裂,劈裂的宽度为2h_0;磁交换能h_0同时对散粒噪声及噪声功率与平均电流的比值有抑制作用.Abstract: Considering the dependence of the gap on the exchange energy in ferromagnetic d-wave superconductor, we use an extended Blonder-Tinkham-Klapwijk approach to investigate the shot noise in semiconductor/ferromagnetic d-wave superconductor junction by solving the Bogoliubov-de Gennes( BdG) equation. It is shown that the exchange energy h_0 in the ferromagnetic d-wave superconductor may induce a split of the shot noise double-peak at zero-bias and the energy gap peak, and the interval between the two split peaks is equal to 2h_0; furthermore, with the increasing exchange energy h_0 , the shot noise and the ratio of shot noise power to average current are restrained.
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