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Dynamics of non-equilibrium states in correlated electron systems with broken symmetry

对称性破缺相关电子系统中非平衡态的动力学

基本信息

批准号：
279852288
负责人：
Professor Dr. Götz Seibold
金额：
--
依托单位：
Dipartimento di Fisica
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/279852288?language=en
关键词：
Dynamics non equilibrium states correlated

项目摘要

Pump-Probe experiments, where the time evolution of a system can be studied after a short excitation pulse, have been recently also applied to materials with strong electronic correlations. Such systemsare often characterized by a ground state with charge, spin or (and) orbital order where the translational symmetry and rotational symmetry with respect to spin or (and) orbital states is sponaneouslybroken. Pump-probe experiments allow in principle to study separately the dynamics of charge, spin and orbital degrees of freedom. Within the proposed project it is planned to investigate thetime evolution of electronically inhomogeneous and correlated states starting from an non-equilibrium situation, i.e. after pumping. Methodically the project is based on the time-dependent Gutzwillerapproach which represents a very good approximation for the calculation of the dynamics of correlated systems. Moreover the method has the advantage that it can handle sufficiently largesystems and it has already been succesfully applied to the calculation of ground state properties of symmetry broken states. Aim of the project is the investigation of the dynamics of coupled spin- andcharge density waves which have been observed in nickelates, cuprates and manganites. In collaboration with the group of Prof. Carbone (Lausanne) it is planned to analyze experimental data fortime-dependent optical properties of high-Tc cuprates.In this regard the project also intends to clarify the role of different relaxation mechanisms on the dynamics of spin and charge degrees of freedom.

泵浦-探测实验，其中一个系统的时间演化可以在一个短的激发脉冲后进行研究，最近也被应用到具有强电子相关性的材料。这类系统的特征通常是具有电荷、自旋或（和）轨道序的基态，其中相对于自旋或（和）轨道态的平移对称性和旋转对称性自发破缺。泵浦探测实验原则上允许分别研究电荷、自旋和轨道自由度的动力学。在拟议的项目中，计划调查电子不均匀和相关状态的时间演变，从非平衡状态开始，即泵浦后。该项目是基于时间相关的Gutzwiller方法，这是一个很好的近似计算相关系统的动态。此外，该方法还具有处理足够大系统的优点，并已成功地应用于对称破缺态基态性质的计算.该项目的目的是研究在镍酸盐、铜酸盐和锰氧化物中观察到的耦合自旋-电荷密度波的动力学。与Carbone教授（洛桑）的研究小组合作，计划分析高温铜酸盐随时间变化的光学性质的实验数据，在这方面，该项目还打算阐明不同弛豫机制对自旋和电荷自由度动力学的作用。