Universality and origin of ultrashort intrinsic negative dielectric permittivity

Article

关键词: FERROELECTRICS;    CAPACITANCE;   

DOI  :  10.1103/PhysRevB.101.024111

来源: SCIE

【 摘 要 】

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.

【 授权许可】

Free