Fundamental Experimental Properties of Mesoscopic Systems

小行星9730577 这是一个凝聚态物理项目，研究电子通过亚微米导体传输的量子力学性质。在这些非常小的结构中，电子波函数波长的相位是重要的变量，可以通过各种微妙的实验装置来探测。该项目将系统地探索介观系统的相位相干输运性质的时间尺度比相位相干时间短得多，长得多。最先进的 直流超导量子干涉 装置（SQUID）将被用来研究单个和阵列的金属环的磁响应的大小依赖性。 目的是了解为什么相位相干回路中的持续电流似乎具有比预期大几个数量级的量子涨落。 此外，将研究尺寸接近近藤屏蔽长度的介观系统的磁性和输运性质。 的 项目 提供 特殊 为研究生和博士后提供教育机会。 他们参与了凝聚态物理学前沿的智力挑战性研究。这些实验需要最新的制造和测量方法，并为学生提供广泛的科学或技术职业。 这是一个凝聚态物理项目， 微细加工方法 到 准备 超小型结构。 大部分工作都集中在理解电子如何流过纳米结构上。 传统的想法电流不适用，和电子的波动力学性质占主导地位的响应电流的循环，阵列的循环，薄膜等该项目解决了目前尚未解决的问题，在量子力学的纳米结构的几何形状。这些问题与涉及微电子工业的那些人有关，在微电子工业中，晶体管的尺寸稳定地减小到所谓的介观领域，在介观领域中量子力学变得重要。另一个项目涉及含有磁性杂质原子的纳米线的性质。 杂质影响电子输运 以令人惊讶且人们知之甚少的方式。 该项目为研究生和博士后提供了特殊的教育机会。 他们参与了具有智力挑战性的研究， 物质物理学 这些实验需要最新的制造和测量方法，并为学生提供广泛的科学或技术职业。 ***

9730577 Webb This is a condensed matter physics project that investigates the quantum mechanical properties of electron transport through submicron conductors. In these very small structures the phase of the wavelength of the electron wave function are important variables that are probed by a variety of subtle experimental arrangements. The project will systematically explore the phase coherent transport properties of mesoscopic system on time scales much shorter and much longer than the phase coherence time. State- of-the-art dc superconducting quantum interference devices (SQUIDs) will be used to study the size dependence of the magnetic response of both single and arrays of metal rings. The object is an understanding of why the persistent current in phase coherent loops appears to have quantum fluctuations which are orders of magnitude larger than expected. In addition, magnetic and transport properties of mesoscopic systems whose size approaches that of the Kondo screening length will be studied. The project provides exceptional educational opportunities for graduate students and post-doctoral associates. They are involved in intellectually challenging research at the frontiers of condensed matter physics. The experiments require the latest fabrication and measurement methods and prepare the students for a wide range of scientific or technical careers. %%% This is a condensed matter physics project that employs state-of- the-art micro-fabrication methods to prepare ultra-small structures. Much of the work is focused on understanding how electrons flow through the nanoscale structures. Conventional ideas of current flow do not apply, and the wave-mechanical properties of the electron dominate the response of currents in loops, arrays of loops, films, etc. The project addresses currently unsolved problems in the quantum mechanical behav ior of the nanostructures. These problems are relevant to those involved in the microelectronics industry where the size of transistors is steadily decreasing to the so-called mesoscopic realm where quantum mechanics becomes important. An additional project deals with the properties of nano-wires containing magnetic impurity atoms. The impurities influence the electron transport in surprising and poorly understood ways. The project provides exceptional educational opportunities for graduate students and post-doctoral associates. They are involved in intellectually challenging research at the frontiers of condensed matter physics. The experiments require the latest fabrication and measurement methods and prepare the students for a wide range of scientific or technical careers. ***