Spin and heat transport in one-dimensional quantum magnets

一维量子磁体中的自旋和热传输

• 批准号: 64100872
• 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 Units
• 财政年份: 2008
• 资助国家: 德国
• 起止时间: 2007-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/64100872?language=en
• 关键词: Spin; heat; transport; dimensional; quantum

For one-dimensional quantum spin systems experimental and theoretical studies indicate unexpectedly large, in some cases diverging, spin and heat transport coefficients. This can be the basis of a radically new concept of spin transport – the coherent transport of magnetic information. In the proposed research, pure magnetic excitations like magnons will be used to carry spin information and energy on magnetic lattices. This transport phenomenon is independent of charge motion, which is the prerequisite of usual investigations of spin transport using spin-polarized electron currents. In the proposed work, we want to clarify the relaxation mechanisms and interdependence of spin and heat currents in combined heat transport and magnetic resonance studies. Extending conventional transport and magnetic resonance measurement concepts, we want to develop new techniques for generating pulsed spin and heat currents based on thermal pumping.

对于一维量子自旋系统，实验和理论研究表明，在某些情况下，自旋和热输运系数出乎意料地大。这可以成为一个全新的自旋输运概念的基础——磁信息的相干输运。在提出的研究中，像磁振子这样的纯磁激发将被用来在磁晶格上携带自旋信息和能量。这种输运现象与电荷运动无关，这是利用自旋极化电子电流研究自旋输运的先决条件。在提出的工作中，我们希望澄清在热输运和磁共振联合研究中自旋和热流的弛豫机制和相互依赖性。在传统输运和磁共振测量概念的基础上，我们希望开发基于热泵的脉冲自旋和热流产生新技术。