Electric-field-induced intradimer charge disproportionation in the dimer-Mott insulatorβ'-(BEDT-TTF)2ICl2.
Electric-field-induced intradimer charge disproportionation in the dimer-Mott insulatorβ'-(BEDT-TTF)2ICl2.
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二聚体-莫特绝缘体β-(BEDT-TTF)2ICl2 中电场诱导的内二聚体电荷歧化。
DOI：
10.1103/physrevb.95.085149
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Hiromi Taniguchi and Hideo Kishida
中科院分区：
文献类型：
--
作者：
Yuma Hattori;Satoshi Iguchi,Takahiko Sasaki;Shinichiro Iwai;Hiromi Taniguchi and Hideo Kishida
研究了二聚体-莫特绝缘体[BEDT-TTF =二（乙烯二硫）四硫代烯]在静电场作用下的拉曼散射光谱。电场的作用在光谱中电荷敏感拉曼模型的原始峰值位置两侧诱导出两个额外的拉曼峰。在10 kV/cm时，原始峰几乎消失，只观察到新出现的峰。这些峰的出现表明二聚体内部发生了场诱导的电荷歧化。喇曼信号随电场反转的时间变化表明了电荷不成比例二聚体的宏观畴形成。直接测量偏振进一步证实了这一点。
Raman scattering spectra of the dimer-Mott insulator[BEDT-TTF = bis(ethylenedithio)tetrathiafulvalene] under a static electric field are investigated. The application of the electric field induces two additional Raman peaks on both sides of the original peak position of the charge-sensitive Raman modein the spectra. At 10 kV/cm, the original peak almost disappears and only the newly emerging peaks are observed. The emergence of these peaks indicates the field-induced charge disproportionation within the dimer. The temporal change of the Raman signals with the inversion of the electric field suggests a macroscopic domain formation of the charge-disproportionate dimers. This picture is reinforced by the direct measurement of the polarization.