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Domain wall migration-mediated ferroelectric switching and Rashba effect tuning in GeTe thin films

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arXiv:2404.13293v1 Announce Type: new
Abstract: Germanium Telluride (GeTe), identified as a ferroelectric Rashba semiconductor, is a promising candidate for future electronic devices in computing and memory applications. However, its ferroelectric switching on a microscopic scale remains to be understood. Here, we propose that the migration of a domain wall can be the mechanism that mediates the ferroelectric switching. By employing $ab~initio$ methods, such a mechanism is characterized by an energy barrier of $66.8$ meV/nm$^2$, in a suitable range for retention and switchability. In accompanying the domain wall migration, the net Rashba effect is tunable, as it is a result of competition between layers with opposite electric polarization. These results shed light on the ferroelectric switching mechanism in GeTe, paving stones for the design of potential GeTe-based devices.

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