Hysteretic switching of domain states is a salient characteristic of all ferroic materials and the foundation for their multifunctional applications. Ferro-rotational order is emerging as a type of ferroic order that features structural rotations, but control over state switching remains elusive due to its invariance under both time reversal and spatial inversion. Here we demonstrate electrical switching of ferro-rotational domain states in the charge-density-wave phases of nanometre-thick 1T-TaS2 crystals. Cooling from the high-symmetry phase to the ferro-rotational phase under an external electric field induces domain state switching and domain wall formation, which is realized in a simple two-terminal configuration using a volt-scale bias. Although the electric field does not couple with the order due to symmetry mismatch, it drives domain wall propagation to give rise to reversible, durable and non-volatile isothermal state switching at room temperature. These results offer a route to the manipulation of ferro-rotational order and its nanoelectronic applications.
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We thank J. Yu and C. Wang for assistance with the atomic force microscopy measurements. This work was supported by the National Key Research and Development Program of China (grant numbers 2018YFA0307000, 2017YFA0303201 and 2021YFA1400400), the National Natural Science Foundation of China (grant numbers 11774151, 12225407, 12204160 and 12074174, and A3 Foresight Program 51861145201) and the Fundamental Research Funds for the Central Universities (grant number 0204-14380212). K.W. and T.T. acknowledge support from JSPS KAKENHI (grant numbers 19H05790, 20H00354 and 21H05233) and A3 Foresight by JSPS. B.Y. acknowledges the financial support by the European Research Council (ERC Consolidator Grant ‘NonlinearTopo’, number 815869).
The authors declare no competing interests.
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Liu, G., Qiu, T., He, K. et al. Electrical switching of ferro-rotational order in nanometre-thick 1T-TaS2 crystals. Nat. Nanotechnol. 18, 854–860 (2023). https://doi.org/10.1038/s41565-023-01403-5
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