Spin selectivity through chiral polyalanine monolayers on semiconductors

Abstract

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.

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• Unusual Spin Polarization in the Chirality Induced Spin Selectivity
• Structural Chirality and Electronic Chirality in Quantum Materials
• A mechanism for electrostatically generated magnetoresistance in chiral systems without spin-dependent transport
• A group-theoretic approach to the origin of chirality-induced spin selectivity in non-magnetic molecular junctions
• Magnetochiral Charge Pumping due to Charge Trapping and Skin Effect in Chirality-Induced Spin Selectivity
• Mind the Gap: From Resolving Theoretical Foundations of Chiral(ity)-Induced Spin Selectivity to Pioneering Implementations in Quantum Sensing
• Spin conductances and magnetization production in chiral molecular junctions
• Magnetoresistance effect based on spin-selective transport in nanodevices using chiral molecules
• Anomalous Magnetoresistance beyond the Jullière Model for Spin Selectivity in Chiral Molecules
• Chirality-controlled spin scattering through quantum interference
• Linear-response magnetoresistance effects in chiral systems
• Engineering chiral-induced spin selectivity in an artificial topological quantum well
• The temperature-dependent chiral-induced spin selectivity effect: Experiments and theory