CAREER: Quantum Tunneling in Superconducting and Ferromagnetic Nanoscale Structures

* 非技术摘要 * 该学院早期职业奖支持一个项目，其目标是详细了解一维（1D）超导导线以及一维和零维铁磁结构中的量子现象。该项目的直接动机是将纳米级出现的新物理学纳入更好，功能更强的材料和设备的设计中。具体而言，一维超导体维持高磁场的独特能力可以用于设计更紧凑的超导磁体，并将导致更有效的电力传输和分配。 对一维超导体物理学的详细了解可以提供控制的新方法，事实上，可以通过耦合到耗散环境来增强纳米级的超导性。对铁磁结构的研究结果可能会影响磁记录的实际应用。研究生和本科生将参与一个令人兴奋的多学科研究，涵盖物理学，材料科学，纳米技术和电气工程。小型项目也将提供给当地高中科学教师和高中学生谁将参与夏季研究磁性。一门新的本科课程？现代技术与生命科学的物理学核心将被开发。本课程将加强电磁学，量子力学和统计力学的核心知识，并精心挑选技术上重要的设备和结构的例子。技术摘要 * 该学院早期职业奖支持一个项目，其目标是详细了解一维超导导线和一维和零维铁磁结构中的量子现象。该项目的直接动机是将纳米级出现的新物理学纳入更好，功能更强的材料和设备的设计中。一维纳米线中超导体-绝缘体转变的机制将通过用磁场连续驱动转变穿过临界区域来研究。一个高采样率的技术，用于检测个人的相位滑移将开发和时间之间的相关性热和量子相位滑移将进行研究。耗散对量子相位滑移的影响将通过改变导线的电磁环境来阐明。通过在悬浮的绝缘碳纳米管上沉积钴、坡莫合金和稀土磁性合金，可以制备出一系列均匀的铁磁纳米线。该导线将用于测试极端受限磁畴壁的性能。低温输运测量将进行在这些线中的畴壁的量子成核和量子脱钉搜索。研究生和本科生将参与一个令人兴奋的多学科研究，涵盖物理学，材料科学，纳米技术和电气工程。小型项目也将提供给当地高中科学教师和高中学生谁将参与夏季研究磁性。一个新的本科课程将加强电磁学，量子力学和统计力学的核心知识，精心挑选的技术重要的设备和结构的例子。

****NON-TECHNICAL ABSTRACT**** This Faculty Early CAREER award supports a project with an objective to develop detailed understanding of quantum phenomena in one-dimensional (1D) superconducting wires and in one and zero-dimensional ferromagnetic structures. The project is directly motivated by prospects of incorporating new physics that emerges at the nanoscale into the design of better, more functional materials and devices. Specifically, the unique ability of one-dimensional superconductors to sustain high magnetic fields could be utilized in the design of more compact superconducting magnets and would result in more efficient transmission and distribution of electric power. Detailed understanding of the physics of 1D-superconductors could provide new methods of controlling and, in fact, enhancing superconductivity at the nanoscale, for example by coupling to a dissipative environment. The outcome of the study on the ferromagnetic structures may influence practical applications in magnetic recording. Graduate and undergraduate students will be involved in an exciting multi-disciplinary research that covers physics, material sciences, nanotechnology and electrical engineering. Small projects will be also offered to local high school science teachers and high school students who will be involved in summer research on magnetism. A new undergraduate course ?Physics Core of Modern Technology and Life Science? will be developed. The course will reinforce the core knowledge of electromagnetism, quantum mechanics and statistical mechanics with carefully selected examples of technologically important devices and structures.****TECHNICAL ABSTRACT****This Faculty Early CAREER award supports a project with an objective to develop detailed understanding of quantum phenomena in one-dimensional superconducting wires and in one and zero-dimensional ferromagnetic structures. The project is directly motivated by prospects of incorporating new physics that emerges at the nanoscale into the design of better, more functional materials and devices. The mechanism of superconductor-insulator transition in 1D nanowires will be investigated by continuously driving the transition across the critical regime with a magnetic field. A high sampling-rate technique for detection of individual phase slips will be developed and temporal correlations between thermal and quantum phase slips will be studied. The effect of dissipation on quantum phase slips will be elucidated by varying the electromagnetic environment of a wire. A series of homogeneous ferromagnetic nanowires will be fabricated by depositing cobalt, permalloy and rare earth magnetic alloys on top of suspended insulated carbon nanotubes. The wires will be used to test properties of extremely constrained magnetic domain walls. Low temperature transport measurements will be carried out in search for quantum nucleation and quantum depinning of domain walls in these wires. Graduate and undergraduate students will be involved in an exciting multi-disciplinary research that covers physics, material sciences, nanotechnology and electrical engineering. Small projects will be also offered to local high school science teachers and high school students who will be involved in summer research on magnetism. A new undergraduate course will reinforce the core knowledge of electromagnetism, quantum mechanics and statistical mechanics with carefully selected examples of technologically important devices and structures.