Linear and Nonlinear Two-Terminal Spin-Valve Effect from Chirality-Induced Spin Selectivity
Author(s): Liu, TH (Liu, Tianhan); Wang, XL (Wang, Xiaolei); Wang, HL (Wang, Hailong); Shi, G (Shi, Gang); Gao, F (Gao, Fan); Feng, HL (Feng, Honglei); Deng, HY (Deng, Haoyun); Hu, LQ (Hu, Longqian); Lochner, E (Lochner, Eric); Schlottmann, P (Schlottmann, Pedro); von Molnar, S (von Molnar, Stephan); Li, YQ (Li, Yongqing); Zhao, JH (Zhao, Jianhua); Xiong, P (Xiong, Peng)
Source: ACS NANO Volume: 14 Issue: 11 Pages: 15983-15991 DOI: 10.1021/acsnano.0c07438 Published: NOV 24 2020
Abstract: Various mechanisms of electrical generation of spin polarization in nonmagnetic materials have been a subject of broad interest for their underlying physics and device potential in spintronics. One such scheme 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 assembled on different surfaces. However, the microscopic origin and transport mechanisms remain controversial. In particular, the fundamental Onsager relation was argued to preclude linear-response detection of CISS by a ferromagnet. Here, we report definitive observation of CISS-induced magnetoconductance in vertical heterojunctions of (Ga,Mn)As/AHPA-L molecules/Au, directly verifying spin filtering by the AHPA-L molecules via spin detection by the (Ga,Mn)As. The pronounced and robust magnetoconductance signals resulting from the use of a magnetic semiconductor enable a rigorous examination of its bias dependence, which shows both linear- and nonlinear-response components. The definitive identification of the linear-response CISS-induced two-terminal spin-valve effect places an important constraint for a viable theory of CISS and its device manifestations. The results present a promising route to spin injection and detection in semiconductors without using any magnetic material.
Accession Number: WOS:000595533800139
PubMed ID: 33136367
Author Identifiers:
Author Web of Science ResearcherID ORCID Number
Wang, Xiaolei 0000-0002-6964-2453
Liu, Tianhan 0000-0003-3934-0785
ISSN: 1936-0851
eISSN: 1936-086X
