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HL: Fachverband Halbleiterphysik

HL 21: Focus Session: Quantum Sensing with Solid State Spin defects II (joint session TT/HL/MA)

HL 21.4: Vortrag

Mittwoch, 11. März 2026, 10:15–10:30, HSZ/0101

CISS from Vibrationally Assisted Tunneling in Chiral Molecules — •Fedor Baranov, Virginia Gali, and Maxim Breitkreiz — Dahlem Center for Complex Quantum Systems, Freie Universitat Berlin, Arnimallee 14, 14195 Berlin, Germany

Chiral-induced spin selectivity (CISS) remains a puzzling phenomenon, despite extensive experimental evidence. A possible explanation emerges when recognizing that charge transport through chiral insulating molecules occurs in the tunneling regime, where even small spin-orbit coupling becomes crucial inside the barrier. This enhancement leads to a spin-dependent potential that gives different tunneling probabilities for different spin orientations. Because this tunneling alone produces extremely small currents, one has to take into account the vibrational degrees of freedom of the system that in the static limit increases the current while preserving the spin splitting nature. Together, these ingredients offer a transparent physical mechanism underlying the CISS effect.

Keywords: chirality; spin; tunneling; phonons; selectivity