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Hysteretic switching of domain states is a salient character of all ferroicmaterials and the foundation for their multifunctional applications.Ferro-rotational order is emerging as a new type of ferroic order featuringstructural rotations, but its controlled switching remains elusive due to itsinvariance under both time reversal and spatial inversion. Here, we demonstrateelectrical switching of ferro-rotational domain states in nanometer-thick1T-TaS$_2$ crystals in its charge-density-wave phases. Cooling from thehigh-symmetry phase to the ferro-rotational phase under an external electricfield induces domain state switching and domain wall formation, realized in asimple two-terminal configuration using a volt-scale voltage. Although theelectric field does not couple with the order due to symmetry mismatch, itdrives domain wall propagation to give rise to reversible, durable, andnonvolatile isothermal state switching at room temperature. These results pavethe path for manipulation of the ferro-rotational order and its nanoelectronicapplications.

Electrical switching of ferro-rotational order in nano-thick 1T-TaS$_2$ crystals