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arXiv 1208.4450cond-mat.str-elcond-mat.mtrl-sci
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二聚体Mott绝缘体系中的集体电荷激发

Collective Charge Excitation in a Dimer Mott Insulating System

Makoto Naka, Sumio Ishihara

摘要:

研究了非极性二聚体Mott(DM)相和极性电荷有序(CO)相相互竞争的二聚体Mott绝缘体系中的电荷动力学。特别是,集体电荷激发在三个不同的模型,其中考虑到在二聚体的内部自由度进行了分析。集体电荷激发在非极性DM相和极性CO相中均存在,并在相界软化。该模式可通过光学电导率光谱观察到,其中光偏振平行于极性CO相中的电极化的强度。讨论了kappa-(BEDT-TTF)_2Cu_2(CN)_3的理论与实验结果之间的联系。

英文摘要:

Charge dynamics in a dimer Mott insulating system, where a non-polar dimer-Mott (DM) phase and a polar charge-ordered (CO) phase compete with each other, are studied. In particular, collective charge excitations are analyzed in the three different models where the internal-degree of freedom in a dimer is taken into account. Collective charge excitation exists both in the non-polar DM phase and the polar CO phase, and softens in the phase boundary. This mode is observable by the optical conductivity spectra where the light polarization is parallel to the electric polarization in the polar CO phase. Connections between the present theory and the recent experimental results in kappa-(BEDT-TTF)2Cu2(CN)3 are discussed.

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