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Universality and origin of ultrashort intrinsic negative dielectric permittivity

Abstract : By recasting the definition of the dielectric constants in terms of currents, as well as using atomistic simulations and analytical derivations, we show that the dielectric permittivity can be negative at an ultrashort timescale, under perfect screening conditions and for very different materials and switching mechanisms, in line with recent experiments and modelings. In particular, we found that this effect can be due to a previously overlooked phenomenon of postswitching polarization oscillations. We also derived practical analytical formulas that can be experimentally checked.
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https://hal.archives-ouvertes.fr/hal-02482767
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Submitted on : Tuesday, February 18, 2020 - 11:46:01 AM
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Sergey Prosandeev, Charles Paillard, B. Xu, L. Bellaiche. Universality and origin of ultrashort intrinsic negative dielectric permittivity. Physical Review B : Condensed matter and materials physics, American Physical Society, 2020, 101, ⟨10.1103/PhysRevB.101.024111⟩. ⟨hal-02482767⟩

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