Topological analog of the magnetic bit within the Su-Schrieffer-Heeger-Holstein model

TL;DR

This paper proposes a topological analogue of magnetic bits within the SSH-Holstein model, demonstrating that external perturbations can induce permanent changes in electronic band topology, akin to flipping a magnetic bit.

Contribution

It introduces a novel topological analogue of magnetic bits in a well-known condensed matter model, showing how external stimuli can alter electronic topology permanently.

Findings

External perturbations can induce topological phase transitions.

The model demonstrates a stable topological state change.

Potential implications for topological memory devices.

Abstract

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.