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Emergence of charge density wave and Ising superconductivity in centrosymmetric monolayer 1T-HfTe2

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Abstract

Understanding and control of many-body collective phenomena such as charge density wave (CDW) and superconductivity in atomically thin crystals remains a hot topic in material science. Here, using first-principles calculations, we find that 1T-HfTe2 possessing no CDWs in the bulk form, unexpectedly shows a stable 2 × 2 CDW order in the monolayer form, which can be attributed to the enhancement of electron–phonon coupling (EPC) in the monolayer. Meanwhile, the CDW induces a metal-to-insulator transition in monolayer 1T-HfTe2 through the accompanying lattice distortion. Remarkably, Ising superconductivity with a significantly enhanced in-plane critical field can emerge in centrosymmetric monolayer 1T-HfTe2 after the CDW is suppressed by electron doping. The Ising paring is revealed to be protected by the spin–orbital locking without the participation of the inversion symmetry breaking which is a must for conventional 2H-NbSe2-like Ising superconductors. Our results open a new window for designing and controlling novel quantum states in two-dimensional (2D) matter.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 12274013 and 11874079), the open research fund program of the State key laboratory of low dimensional quantum physics (No. KF202103), and the Independent Research Project of Medical Engineering Laboratory of Chinese PLA General Hospital (No. 2022SYSZZKY10).

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  1. Department of Medical Engineering, Medical Supplies Center of PLA General Hospital, Beijing, 100053, China

    Dawei Wang

  2. School of Materials Science and Engineering, Beihang University, Beijing, 100191, China

    Dawei Wang, Jizheng Wu & Chen Si

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Wang, D., Wu, J. & Si, C. Emergence of charge density wave and Ising superconductivity in centrosymmetric monolayer 1T-HfTe2. Nano Res. 16, 11521–11527 (2023). https://doi.org/10.1007/s12274-023-5780-1

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