Thermal transport in low dimensional quantum spin systems: scattering processes for magnetic excitations

低维量子自旋系统中的热传输：磁激发的散射过程

• 批准号: 30429210
• 负责人: Professor Dr. Christian Hemker-Heß
• 金额: --
• 依托单位: Institut für Festkörperforschung
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2010-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/30429210?language=en
• 关键词: Thermal; transport; low; dimensional; quantum

Studying transport properties provides important information about mobility, scattering and dissipation of excitations in solids. This is well established for both electronic excitations (which are the basis of modern microelectronics) and lattice vibrations (phonons). However, surprisingly large magnetic thermal conductivities have recently been discovered in low dimensional quantum spin systems, which allow the investigation of magnetic excitations using transport properties up to high temperatures (room temperature and above). Despite their high relevance in basic and applied contemporary research (e.g. in ¿spintronics¿), little is known about the transport properties and the scattering mechanisms of these magnetic excitations. Our project therefore aims to carry out an experimental investigation of the magnetic thermal conductivity of various low dimensional quantum spin systems. The thermal conductivity will thereby be used as a probe for the most relevant scattering mechanisms. In particular we will systematically study the interaction of magnetic excitations with defects, charge carriers, phonons and other magnetic excitations.

研究输运性质提供了关于固体中激发的迁移率、散射和耗散的重要信息。这对于电子激发（这是现代微电子学的基础）和晶格振动（声子）都是很好的建立。然而，令人惊讶的大的磁热导率最近被发现在低维量子自旋系统，这使得磁激发的研究使用的运输性能高达高温（室温及以上）。尽管它们在基础和应用当代研究（例如在<$spintronics <$）中具有高度相关性，但对这些磁激发的输运性质和散射机制知之甚少。因此，我们的项目旨在对各种低维量子自旋系统的磁热导率进行实验研究。因此，热导率将被用作最相关的散射机制的探针。特别是我们将系统地研究磁激发与缺陷，载流子，声子和其他磁激发的相互作用。