Quantum transport of topological spin solitons in a one-dimensional organic ferroelectric

We report the dielectric, magnetic, and ultrasonic properties of a one-dimensional organic salt TTF-QBr$_3$I. These indicate that TTF-QBr$_3$I shows ferroelectric spin-Peierls (FSP) state in quantum critical regime. In FSP state, coupling charge, spin, lattice leads to emergent excitation spin solitons as topological defects. Amazingly, are highly mobile even at low temperatures, although they normally stationary because pinning. Our results suggest strong fluctuations enhanced near point enable soliton motion governed by athermal relaxation. This indicates realization transport ambient pressure.