Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 34: Molecular Magnetism
MA 34.2: Talk
Thursday, March 20, 2025, 09:45–10:00, H18
Polarization of Electron Spin and Orbitals in Chiral Molecular Junctions on Semiconductors — •Peng Xiong1, Yuwaraj Adhikari1, Tianhan Liu1,3, Hailong Wang2, Zhenqi Hua1, Haoyang Liu1, Paul Weiss3, Binghai Yan4, and Jianhua Zhao2 — 1Florida State University, USA — 2Institute of Semiconductors, Chinese Academy of Sciences, China — 3University of California, Los Angeles, USA — 4Weizmann Institute of Science, Israel
Electrical generation and transduction of polarized electron spins in semiconductors via nonmagnetic means are of broad interest in spintronics and quantum information science. One such pathway is chirality-induced spin selectivity (CISS), where real-space structural chirality induces spin polarization of electrons from a nonmagnetic electrode. We have studied the CISS effect through measurement of spin-selective transport in chiral molecular junctions comprising a nonmagnetic normal metal electrode and a self-assembled monolayer of chiral molecules on magnetic (GaMnAs) or nonmagnetic (n-GaAs) semiconductors, where the spin polarization is detected via the spin-valve conductance and Hanle effect, respectively. The results reveal several important characteristics of the CISS effect [1-3]: i) nontrivial linear-response magnetoconductance in two-terminal CISS spin valves, in apparent violation of the Onsager reciprocal relation; ii) crucial role of the spin-orbit coupling in the normal metal electrode, suggesting the importance of orbital polarization in the chiral molecules; iii) spin generation by CISS in semiconductors. 1. ACS Nano 14, 15983 (2020); 2. Nat. Commun. 14:5163 (2023) ; 3. Ad. Mater. 36, 2406347 (2024).
Keywords: chirality-induced spin selectivity; spin generation; spin-dependent transport; orbital polarization