论文标题
通过手性多苯胺单层在半导体上的旋转选择性
Spin selectivity through chiral polyalanine monolayers on semiconductors
论文作者
论文摘要
在非磁性材料中的极化旋转的电发电对于基础物理和设备潜力引起了极大的兴趣。一种这样的机制是手性诱导的自旋选择性（CISS），结构手性导致相反自旋电子的电导率不同。已经报道了许多手性分子的自旋滤波的作用。但是，实际设备结构中CISS的微观机制和表现仍然存在争议。特别地，将Onsager的关系理解为排除Ferromagnet对CISS的线性反应检测。 Here, we report direct evidence of CISS in two-terminal devices of chiral molecules on the magnetic semiconductor (Ga,Mn)As: In vertical heterojunctions of (Ga,Mn)As/AHPA-L molecules/Au, we observed characteristic linear- and nonlinear-response magnetoconductance, which directly verifies spin filtering by the AHPA-L molecules and spin detection by the （GA，MN）AS。该结果构成了CISS诱导的自旋阀效应的明确特征，这是一种核心自旋式功能，显然违反了Onsager互惠。结果呈现出没有任何磁性材料的半导体旋转型的有希望的途径。
Electrical generation of polarized spins in nonmagnetic materials is of great interest for the underlying physics and device potential. One such mechanism is chirality-induced spin selectivity (CISS), with which structural chirality leads to different electric conductivities for electrons of opposite spins. The resulting effect of spin filtering has been reported for a number of chiral molecules. However, the microscopic mechanism and manifestation of CISS in practical device structures remain controversial; in particular, the Onsager relation is understood to preclude linear-response detection of CISS by a ferromagnet. Here, we report direct evidence of CISS in two-terminal devices of chiral molecules on the magnetic semiconductor (Ga,Mn)As: In vertical heterojunctions of (Ga,Mn)As/AHPA-L molecules/Au, we observed characteristic linear- and nonlinear-response magnetoconductance, which directly verifies spin filtering by the AHPA-L molecules and spin detection by the (Ga,Mn)As. The results constitute definitive signature of CISS-induced spin valve effect, a core spintronic functionality, in apparent violation of the Onsager reciprocity. The results present a promising route to semiconductor spintronics free of any magnetic material.
