Magnetic quantum oscillations in nanowires

纳米线中的磁量子振荡

• 批准号: EP/D035589/1
• 负责人: A Alexandrov
• 金额: $ 20.48万
• 依托单位: Loughborough University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD035589%2F1
• 关键词: Magnetic; quantum; oscillations; nanowires

A large number of today's most interesting condensed matter systems can be classified as materials of reduced dimensionality; examples include layered cuprates and ruthenates, organic conductors, some heavy-fermion systems, semiconductor heterostructures and nanowires. In most of these magnetic quantum oscillations of magnetization (the de Haas-van Alphen (dHvA) effect) and/or resistance (the Shubnikov-de Haas (SdH) effect) are extensively used to measure the Fermi-surface and electron correlations.. Essential deviations from the conventional three-dimensional oscillations have been found in low-dimensional conductors. A consistent investigation of the SdH and dHvA effects in multi-band low-dimensional metals, with a particular attention to the difference between canonical and grand canonical ensembles, is one of the project objectives. There are also significant opportunities for discovery of unique galvano-magnetic phenomena arising from the dimension quantization in nanowires and nanotubes, which are manufactured of almost any cross-section down to nanometer scale and of any length using modern nano-technologies. Taking into account a great demand for quantitative characterization of nanowires the proposal seeks to develop the theory of magnetic quantum oscillations in metallic nanowires. We expect that an interplay between size and magnetic energy-quantizations will manifest itself through novel magnetic quantum oscillations. A significant impact of this research is expected on the current experimental and theoretical studies of strongly-correlated low-dimensional electrons and on nano-technologies employing novel materials. Key words: quantum oscillations, low-dimensional metals, nanowires

当今大量最有趣的凝聚态系统可以被归类为降维材料；例如，层状铜酸盐和Ruthenate，有机导体，一些重费米子系统，半导体异质结构和纳米线。其中大多数磁化量子振荡(dHaas-van Alphen(DHvA)效应)和(或)电阻(Shubnikov-de Haas(SDH)效应)被广泛用于测量费米面和电子关联。在低维导体中发现了与传统三维振荡的本质偏差。对多波段低维金属中的SDH和dHvA效应进行一致的研究，特别注意正则系综和巨正则系综间的差异，是该项目的目标之一。纳米线和纳米管中的尺寸量化也为发现独特的电磁场现象提供了重要机会，这些纳米线和纳米管使用现代纳米技术制造出几乎任何横截面，小到纳米尺度和任何长度。考虑到对纳米线定量表征的巨大需求，该提议寻求发展金属纳米线中的磁量子振荡理论。我们预计，大小和磁能量子化之间的相互作用将通过新的磁量子振荡来表现出来。这项研究有望对目前强关联低维电子的实验和理论研究以及使用新材料的纳米技术产生重大影响。关键词：量子振荡、低维金属、纳米线