Domain structures and photoinduced dynamics of electronic ferroelectrics investigated by terahertz-emission microscopy

Abstract

Electronic ferroelectricity, which is peculiarly driven by charge ordering (CO) or strong Coulomb repulsion among charges,[1] has become an important topic in contemporary condensed matter physics, toward gigantic optical responses such as ultrafast photoinduced insulator-to-metal transition or large optical nonlinearity.[2,3] We report herein recent results of terahertz(THz)-wave-emission microscopy to reveal domain structures of prototypical electronic ferroelectrics: strongly-correlated quasi-one-dimensional organic conductors (TMTTF)2X (TMTTF: tetramethyl-tetrathiafulvalene, X = SbF6, AsF6, PF6, ReO4, BF4).[4,5]