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MA: Fachverband Magnetismus
MA 42: Molecular Magnetism and Magnetic Particles / Clusters II
MA 42.4: Vortrag
Donnerstag, 12. März 2026, 10:15–10:30, HSZ/0004
Chirality-induced spin selectivity without intrinsic spin-orbit coupling: Role of non-equilibrium molecular orbital moment — •Sumit Ghosh1 and Daniel E. Bürgler2 — 1The Institute of Physics of the Czech Academy of Sciences, 16200 Prague, Czech Republic — 2Peter Grünberg Institut (PGI-6), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
We present an alternative theory of chirality induced spin selectivity (CISS) that does not require any intrinsic spin orbit coupling (SOC). The proposed mechanism is based on the formation of circulating currents in the molecular rings. In each ring, this current generates a non-equilibrium molecular orbital moment (MOM) which interacts with the spin of an injected electron, giving rise to CISS. The direction of the MOM is governed by the gauge field that arises from the chirality-induced structural distortion of the molecule. Being non-relativistic in nature, the gauge field induced MOM can be stronger than the effect generated by SOC. The presence of such a gauge field also overcomes the hurdle posed by Onsager's reciprocity. Finally we demonstrate that a non-equilibrium MOM can also form in the absence of the gauge field. However only the presence of the gauge field can produce the experimentally observed crossing I-V curve which is a characteristics of the CISS effect.
Keywords: CISS; Molecular orbital moment; Keldysh formalism; Non-equilibrium magnetic moment