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• W2941296773 abstract "${mathrm{SrTiO}}_{3}$ is a unique example of a system which exhibits both quantum paraelectricity and superconductivity. Thus, it is expected that the superconducting state is closely related to the intrinsic ferroelectric instability. Indeed, recent experiments suggest existence of a coexistent phase of superconductivity and ferroelectricity in Ca-substituted ${mathrm{SrTiO}}_{3}$. In this paper, we propose that ${mathrm{SrTiO}}_{3}$ can be a platform of the ferroelectric superconductivity, which is characterized by a ferroelectric transition in the superconducting state. By analyzing a multiorbital model for ${t}_{2g}$ electrons, we show that the ferroelectric superconductivity is stabilized through two different mechanisms which rely on the presence of the spin-orbit coupling. First, the ferroelectric superconducting state is stabilized in the dilute carrier density regime due to a ferroelectricity-induced Lifshitz transition. Second, it is stabilized under a magnetic field independent of the carrier density. The importance of the multiorbital or multiband nature for the ferroelectric superconductivity is clarified. Then, we predict a topological Weyl superconducting state in the ferroelectric superconducting phase of ${mathrm{SrTiO}}_{3}$." @default.
• W2941296773 created "2019-05-03" @default.
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• W2941296773 date "2019-09-03" @default.
• W2941296773 modified "2023-10-17" @default.
• W2941296773 title "Multiorbital ferroelectric superconductivity in doped <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:msub><mml:mrow><mml:mi>SrTiO</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:math>" @default.
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• W2941296773 doi "https://doi.org/10.1103/physrevb.100.094504" @default.
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