  The chirality-induced spin selectivity (CISS) effect gives rise to strongly
spin-dependent transport through many organic molecules and structures. Its
discovery raises fascinating fundamental questions as well as the prospect of
possible applications. The basic phenomenology, a strongly asymmetric
magnetoresistance despite the absence of magnetism, is now understood to result
from the combination of spin-orbit coupling and chiral geometry. However,
experimental signatures of electronic helicity were observed at room
temperature, i.e., at an energy scale that exceeds the typical spin-orbit
coupling in organic systems by several orders of magnitude. This work shows
that a new energy scale for CISS emerges for currents carried by polarons,
i.e., in the presence of strong electron-phonon coupling. In particular, we
found that polaron fluctuations play a crucial role in the two manifestations
of CISS in transport measurements -- the spin-dependent transmission
probability through the system and asymmetric magnetoresistance.
