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Quantum critical transport in electronic systems and spin liquids

电子系统和自旋液体中的量子临界输运

基本信息

批准号：
198775606
负责人：
Dr. Lars Fritz
金额：
--
依托单位：
Department of Physics and Astronomy
依托单位国家：
德国
项目类别：
Independent Junior Research Groups
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/198775606?language=en
关键词：
Quantum critical transport electronic systems

项目摘要

The subject of the project is the study of strongly correlated electronic systems with an emphasis on quantum critical points and critical phases. I intend to study specific aspects of strongly correlated electronic systems, namely transport in systems close to their critical point and spin order/dynamics in highly frustrated magnetic systems, which are possibly spin liquids. Concerning quantum critical transport, the main objectives are a description of non equilibrium transport and an understanding of the interplay of collective modes, disorder, and drag effects. In particular, I plan to study non equilibrium transport in graphene, whose discovery recently was rewarded with the Nobel prize. The interplay of collective modes, disorder, and drag effects will be studied independently in the framework of a generic spin density wave scenario. The insights of both investigations will be applied to describe experiments on thin films of critical ferromagnetic metals in the nonlinear transport regime. Highly frustrated magnetic systems, in particular certain higher dimensional versions of kagomé antiferromagnets, are currently investigated at the Universität zu Köln. These systems have recently been discovered and very little theoretical knowledge about them is available. A first goal is to find a minimal description of their magnetism. The long term objective is to determine whether the systems under investigation qualify as spin liquids. As an interesting perspective the knowledge about transport in correlated systems gained in the first part of the project can be used to investigate heat transport in those strongly correlated spins systems, which is one of the hallmark measurements in the field of spin liquids.

该项目的主题是强相关电子系统的研究，重点是量子临界点和临界相。我打算研究强相关电子系统的特定方面，即接近临界点的系统中的传输以及高度受挫磁系统（可能是自旋液体）中的自旋顺序/动力学。关于量子临界输运，主要目标是描述非平衡输运以及理解集体模式、无序和阻力效应的相互作用。我特别计划研究石墨烯中的非平衡输运，这一发现最近获得了诺贝尔奖。集体模式、无序和阻力效应的相互作用将在通用自旋密度波场景的框架内独立研究。这两项研究的见解将应用于描述非线性传输机制中关键铁磁金属薄膜的实验。科隆大学目前正在研究高度受挫的磁系统，特别是某些高维版本的 Kagomé 反铁磁体。这些系统最近才被发现，但关于它们的理论知识却很少。第一个目标是找到对它们的磁性的最小描述。长期目标是确定所研究的系统是否符合旋转液体的资格。作为一个有趣的视角，在该项目的第一部分中获得的有关相关系统中传输的知识可用于研究那些强相关自旋系统中的热传输，这是自旋液体领域的标志性测量之一。