Systematic investigation of optical and electronic features of spin-charge-photon coupled systems

通过结合不同的专业知识，我们探索了强关联电子系统的介电和磁响应之间的强耦合所产生的新的电子和光学功能。宫野组：我们开发了薄膜制造技术，允许晶格变形与强关联系统的相变相关。该薄膜显示出持续的光致绝缘体/金属转变，新颖的磁电阻，和稳定的两相共存。由于薄膜的单畴性质，现在可以获得完整的各向异性特性。Tokura组：我们探索了由非平凡自旋纹理引起的不寻常的介电响应。在极性亚铁磁体中，我们发现了由环向磁矩引起的非平凡光学非线性克尔旋转和方向二向色性等光学磁电效应。磁感应铁电体是在摆线磁体中发现的， ...更多信息 卡诺达小组：我们探索了具有自旋-电荷和电荷-晶格耦合的分子材料的新量子相。在自旋液体的Mott转变附近发现了由于自旋挫挫和电荷涨落引起的反常相和超导电性，并观察到了中性-离子转变附近晶格二聚化和电荷转移的量子临界涨落。Nagaosa组：我们研究了与Berry相有关的新量子现象。考虑到无序效应，我们建立了反常和自旋霍尔效应的统一理论，并得到了与实验较好的定量符合。我们还发展了光和激子的自旋霍尔效应理论。Gonokami组：我们研究了电子和空穴强关联系统中的新光学现象和功能，包括Mn离子掺杂GaAs的增强太赫兹发射和与磁序相关的强中间带隙杂质诱导吸收。我们还开发了一种高灵敏度的偏振测量方法，适用于非接触式霍尔测量。少

By a combination of different expertises, we explored new electronic and optical functions arising from the strong coupling between the dielectric and magnetic responses of strongly correlated electron systems.Miyano group : We developed thin-film fabrication technique that allows lattice deformations associated with the phase transition of strongly correlated systems. The films display persistent photo-induced insulator/metal transition, novel magnetoresistance, and stable two-phase coexistence. The full anisotropic properties are now accessible due to the mono-domain quality of the films.Tokura group : We have explored unusual dielectric response caused by nontrivial spin textures. In a polar ferrimagnet, we have found the optical magnetoelectric effects such as nontrivial optical nonlinear Kerr rotation and directional dichroism as induced by the toroidal moments. Magnetically induced ferroelectrics is discovered, in cycloidal magnets in which the polarization can be largely modifie … More d by external magnetic field.Kanoda group : We explored new quantum phases of molecular materials with spin-charge and charge-lattice coupling. We found an anomalous phase and superconductivity due to spin frustration and charge fluctuations in the vicinity of the Mott transition of spin liquid and observed the quantum critical fluctuations of lattice dimerization and charge transfer around the neutral-ionic transition.Nagaosa group : We examined the novel quantum phenomena related to the Berry phase. Taking into account the disorder effect, we have constructed the unified and global theory of the anomalous and spin Hall effects and attained the good quantitative agreements with the experiments. We also developed the theory of spin Hall effect of light and excitons.Gonokami group : We investigated new optical phenomena and functions in systems where electrons and holes are strongly correlated, including enhanced terahertz emission from Mn ion doped GaAs and strong mid- gap impurity-induced absorption associated with magnetic order. We also developed a highly sensitive polarimetry method that is applicable to non-contact Hall measurement. Less