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4 October 2024 Polarization of electron spin and orbitals from structural chirality: spin-selective transport in chiral molecular junctions
Peng Xiong
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Proceedings Volume PC13119, Spintronics XVII; PC131191X (2024) https://doi.org/10.1117/12.3028293
Event: Nanoscience + Engineering, 2024, San Diego, California, United States
Abstract
Breaking of spatial inversion symmetry has profound effects on the electronic properties of materials. One prominent manifestation of such effects of much recent interest is chirality-induced spin selectivity (CISS), where real-space structural chirality induces spin polarization of electrons injected from a nonmagnetic normal metal electrode. CISS has been reported in a variety of chiral molecules and inorganic chiral crystals, however, definitive understanding of its physical origin remains elusive. We have studied the CISS effect through measurements of spin-selective transport in chiral molecular junctions on magnetic (GaMnAs) and nonmagnetic (n-GaAs) semiconductors. The robust semiconductor-based device platform enabled a rigorous examination of the bias-dependence of the CISS effect and revealed a key role of the spin-orbit coupling in the normal metal electrode. Our experiments have provided new insights on CISS and demonstrated its potential for enabling semiconductor spintronics free of any magnetic materials.
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Peng Xiong "Polarization of electron spin and orbitals from structural chirality: spin-selective transport in chiral molecular junctions", Proc. SPIE PC13119, Spintronics XVII, PC131191X (4 October 2024); https://doi.org/10.1117/12.3028293
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KEYWORDS
Semiconductors
Electron transport
Polarization
Electrodes
Magnetism
Metals
Magnetic semiconductors
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