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• W4353062137 abstract "We present a numerically exact study of a polaron with quadratic coupling to the oscillator displacement, or ${X}^{2}$ polaron, using two alternative methodological developments. Our results cover both antiadiabatic and adiabatic regimes and the entire range of electron-phonon coupling ${g}_{2}$, from the system's stability threshold at attractive ${g}_{2}=ensuremath{-}1$ to arbitrary strong repulsion at ${g}_{2}ensuremath{gg}1$. The key properties of ${X}^{2}$ polarons prove dramatically different from their linear counterparts. They (i) are insensitive even to large quadratic coupling except in the antiadiabatic limit near the threshold of instability at attraction, (ii) depend only on the adiabatic ratio but are insensitive to the electron dispersion and dimension of space, and (iii) feature weak lattice deformations even at the instability point. Our results are of direct relevance to the properties of electrons at low densities in polar materials, including recent proposals for their superconducting states." @default.
• W4353062137 created "2023-03-23" @default.
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• W4353062137 date "2023-03-22" @default.
• W4353062137 modified "2023-10-18" @default.
• W4353062137 title "Polaron with quadratic electron-phonon interaction" @default.
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• W4353062137 doi "https://doi.org/10.1103/physrevb.107.l121109" @default.
• W4353062137 hasPublicationYear "2023" @default.
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