Experimental Studies of Metal-Insulator Transitions and Superconductivity (Materials Research)

柴金教授建议在几个领域进行调查。(A)计划扩展早期关于测量各种周期、准周期和随机人工产生的超导二维阵列的转变温度的工作。这些阵列是用微光刻技术制作的，超导序参数被用来探测这些系统中波动方程的解。(B)将使用非常精细的周期性结构在镓-砷化合物异质结构中施加周期性势能。低温下的霍尔和磁阻测量将被用来研究预测的与朗道带被周期势分裂为子带有关的“混沌”行为。(C)计划对二十面体堆积合金的输运性质进行进一步的实验。(D)将生产在半导体衬底上外延生长的超薄金属薄膜。将对这些系统进行运输和热电功率测量。(E)将研究新型高温超导材料的热电性能和其他性能。这项拟议工作的主旨是研究各种奇异系统中的电导。这将导致对电导的更好的基本理解，并可能对微电子学的发展具有特别的相关性。

Professor Chaikin proposes investigations in several areas. (a) Extensions of earlier work on measurements of the transition temperature for various periodic, quasi-periodic, and random artificially produced superconducting two dimensional arrays are planned. The arrays are produced using microlithography techniques and the superconducting order parameter is used to probe solutions to the wave equation in these systems. (b) Very fine scale periodic structures will be used to impose a periodic potential in a gallium-arsenide heterostructure. Hall and magnetoresistance measurements at low temperature will be used to investigate a predicted "chaotic" behavior associated with the Landau band being split into sub-bands by the periodic potential. (c) Further experiments on the transport properties of icosahedrally packed alloys are planned. (d) Ultra-thin metallic films epitaxially grown on a semiconductor substrate will be produced. Transport and thermoelectric power measurements will be made on these systems. (e) Thermoelectric power and other properties will be studied in the new high Tc superconducting materials. The thrust of the proposed work is an investigation of electrical conduction in a variety of exotic systems. This will lead to a better fundamental understanding of electrical conduction and may be of particular relevance for microelectronics development.