Purely electronic terahertz polarization in dimer Mott insulators
Purely electronic terahertz polarization in dimer Mott insulators
复制标题
二聚体莫特绝缘体中的纯电子太赫兹偏振
DOI：
10.1103/physrevb.82.035101
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发表时间：
2010
影响因子：
3.7
通讯作者：
M. Aihara
中科院分区：
文献类型：
--
作者：
H. Gomi;T. Imai;A. Takahashi;M. Aihara
从理论上描述了二聚体Mott绝缘体$\ensuremath{\kappa}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}\text{X}$.中太赫兹频段的纯电子极化模式这种反常的低频模式是由传统电偶极矩振荡和交替的中间二聚体键级振荡耦合而成的。这些集体模对二聚体Mott绝缘体的动态介电性质起着重要的作用。在二聚体Mott相变相界附近，由于其中一个集体模的软化，通过引入电子-晶格耦合实现了铁电基态。
We theoretically describe purely electronic polarization modes in terahertz frequency region in dimer Mott insulators $\ensuremath{\kappa}\text{\ensuremath{-}}{(\text{BEDT-TTF})}_{2}\text{X}$. The unusual low-frequency modes arise from the coupling between the oscillation of intradimer electric dipole moments and that of alternating interdimer bond orders. These collective modes play an important role in the dynamical dielectric properties of the dimer Mott insulators. Near the phase boundary of the dimer Mott transition, the ferroelectric ground state is realized by introducing electron-lattice coupling as a result of the softening of one of these collective modes.