期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 77, 期 7, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.77.074709
关键词
charge ordering; ferroelectricity; strong correlation; organic conductor; nonlinear optics; second-harmonic generation
We report experimental evidence for the generation of ferroelectric polarization in an organic conductor alpha-[bis(ethylenedithio)tetrathiafulvalene](2)I-3 obtained by optical second-harmonic generation. The spontaneous polarization emerges along with a metal-to-insulator transition that is driven by the Wigner crystallization of electrons. The strong optical nonlinearity and its ultrafast photoresponse demonstrated by this study exemplify the nature of the ferroelectric polarization that originates from the electron ordering.
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