Nanoscale Study of Unconventional Superconductivity and Topological Phenomena in Complex Oxide and Intermetallic Materials

复杂氧化物和金属间材料中非常规超导性和拓扑现象的纳米研究

• 批准号: 227623-2012
• 负责人: Wei, John
• 金额: $ 2.84万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=546783
• 关键词: Nanoscale; Study; Unconventional; Superconductivity; Topological

This project is intended to study, using a unique combination of nanoscale measurement and synthesis techniques, the unconventional superconductivity and topological phenomena in several complex oxide and intermetallic materials. The complex oxides include the transition-metal cuprates and ruthenates. The intermetallic compounds include the iron-pnictides/chalcogenides and the heavy-metal chalcogenides. These materials and nanolayered heterostructures based on them will be measured using cryomagnetic scanning tunneling spectroscopy and point contact Andreev-reflection spectroscopy, performed down to 300mK and up to 16Tesla. The samples will be in the form of single crystals or thin films. The complex-oxide thin films will be epitaxially grown using pulsed laser-ablated deposition, which enables layer-by-layer heterostructuring via in-situ growth monitoring with reflective high-energy electron diffraction. The scientific goal of this project is to examine the essential characteristics of these quantum materials phenomena, towards elucidating the underlying physical mechanisms. The technological goal is to harness these materials phenomena for use in nanoelectronic devices such as high-speed field effect transistors, and in more esoteric applications such as topological quantum computing elements.

该项目旨在利用纳米级测量和合成技术的独特组合来研究几种复杂氧化物和金属间化合物材料中的非常规超导性和拓扑现象。 复合氧化物包括过渡金属铜酸盐和钌酸盐。金属间化合物包括铁磷族化物/硫族化物和重金属硫族化物。 这些材料和基于它们的纳米层异质结构将使用低温磁扫描隧道光谱和点接触安德烈夫反射光谱进行测量，执行低至 300mK 和高达 16Tesla。样品将呈单晶或薄膜的形式。复合氧化物薄膜将使用脉冲激光烧蚀沉积进行外延生长，从而通过反射高能电子衍射的原位生长监测实现逐层异质结构。 该项目的科学目标是检查这些量子材料现象的基本特征，以阐明潜在的物理机制。 技术目标是利用这些材料现象用于纳米电子设备（例如高速场效应晶体管）以及更深奥的应用（例如拓扑量子计算元件）。