标题： (Ga,Mn)As纳米狭窄结构中的双岛库仑阻塞 显示英文标题

标题： Double island Coulomb blockade in (Ga,Mn)As-nanoconstrictions

摘要： 我们报告了对纳米加工的窄收缩区在薄(Ga,Mn)As薄膜中的库仑阻塞效应的系统研究。 随着收缩尺寸的减小，观察到了不同的低温输运区域：欧姆区域、单电子隧穿（SET）区域和完全绝缘的区域。 在SET中，观察到了具有嵌套库仑菱形的复杂稳定性图以及在电荷简并点附近的异常电导抑制。 我们通过一个与铁磁电极耦合的双铁磁岛模型来解释这些SET中的观察结果。 其输运特性是根据一种改进的库仑阻塞经典理论进行分析的，该理论考虑了金属岛中态密度的能量依赖性。 显示英文摘要

摘要： We report on a systematic study of the Coulomb blockade effects in nanofabricated narrow constrictions in thin (Ga,Mn)As films. Different low-temperature transport regimes have been observed for decreasing constriction sizes: the ohmic, the single electron tunnelling (SET) and a completely insulating regime. In the SET, complex stability diagrams with nested Coulomb diamonds and anomalous conductance suppression in the vicinity of charge degeneracy points have been observed. We rationalize these observations in the SET with a double ferromagnetic island model coupled to ferromagnetic leads. Its transport characteristics are analyzed in terms of a modified orthodox theory of Coulomb blockade which takes into account the energy dependence of the density of states in the metallic islands.