  In magnetic memories, the state of a ferromagnet is encoded in the
orientation of its magnetization. The energy of the system is minimized when
the magnetization is parallel or antiparallel to a preferred (easy) axis. These
two stable directions define the logical bit. Under an external perturbation,
the direction of magnetization can be controllably reversed and thus the bit
flipped. Here, we theoretically design a topological analogue of the magnetic
bit in the Su-Schrieffer-Heeger (SSH)-Holstein model, where we show that a
transient external perturbation can lead to a permanent change in the
electronic band topology.
