Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 23: Contributions to SYLC I
MO 23.3: Vortrag
Donnerstag, 5. März 2026, 11:45–12:00, P 110
Correlation between Circular Dichroism and Chirality-Induced Spin Selectivity — •Raoul M. M. Ebeling1, Maurice Béringuier1, Vladimiro Mujica2, Daniel M. Reich1, and Christiane P. Koch1 — 1Freie Universität Berlin, Berlin, Germany — 2Arizona State University, Arizona, United States of America
We investigate whether absorption circular dichroism (CD) and chirality-induced spin selectivity (CISS) share common physical origins in the interaction of chiral molecules with circularly polarized light. Using a one-electron model in which an effective chiral potential mimics a chiral molecule, we analyze how the chiral potential and spin-orbit coupling strength influence CD and CISS, respectively. We find that the CD signal increases with the chiral potential strength and decreases with stronger spin-orbit coupling. The difference in spin polarization shows a more complex behavior, and we surprisingly find that strong spin-orbit coupling or strong chiral potentials reduce its value. This is caused by the corresponding Hamiltonian terms diminishing the effect of the other, a trend clearly reflected in the energy scales of the competing interactions. Consequently, the strongest enantiomer-sensitivity of the spin polarization is obtained when balancing the two. Lastly, we observe a correlation between CD and CISS that becomes weaker for strong chiral potentials.
Keywords: circular dichroism; chirality-induced spin selectivity; chirality; light-matter interaction