Strongly correlated quantum phase associated with charge fluctuation

超声应变具有特定的对称性，并耦合到电子和离子量子态的电四极子。因此，用超声波测量弹性常数和衰减系数可以确定四极磁化率。在本课题中，我们利用具有高速度分辨率的低温超声相位差测量装置，研究了稀土化合物中局域4f电子的非Kramers双重态、笼形化合物中本振子的振动、掺硼硅晶体中空位轨道在追踪与电荷涨落有关的强关联量子相位中的作用。

The ultrasonic strains have specified symmetries and couple to the electric quadrupoles of the electronic and ionic quantum states. The ultrasonic measurements of the elastic constants and attenuation coefficients, therefore, may determine the quadrupole susceptibility. In the present projects, using low-temperature ultrasonic phase difference measurement apparatus with a highly velocity resolution, we have carried out a study of non-Kramers doublet of localized 4f-electron in rare-earth compounds, rattling of local oscillator in clathrate compounds, vacancy orbital in boron-doped silicon crystal in pursuing strongly correlated quantum phases associated with charge fluctuation.