Thin Films, Heterostructures and Mesoscale Physics of Quasi-One-Dimensional Conductors

w：\awards\awards96\num.doc索恩9705433 这个实验项目的重点是界面的属性， 新颖电荷密度薄膜 波 (CDW)导体，包括Rb0.3MoO3。这类材料是迄今为止发现的最引人注目的导电材料之一，具有许多新颖和潜在的有用特性。 部分工作将建立在德尔夫特理工大学的货车der Zant等人最近的演示之上，该演示表明CDW导体的薄膜可以被制备、图案化和表征，这确实证明了新颖的和潜在有用的CDW现象。该小组与康奈尔大学的Buhrman小组合作，将探索这些材料的脉冲激光沉积。 将研究用于图案化和用于将接触附接到单独的晶粒以及用于制备与其它材料的异质结构的方法。这些电影使各种各样的实验，以探测CDW物理的中尺度方面，并计划几个这样的实验。此外，基于存储器设备的 对 亚稳态CDW状态将是 制造 和表征了介观结构将用于研究CDW相滑移和涡旋动力学。类异质结将允许调制的CDW波矢量，间隙和集体电导。这样的装置可以用作检测器和混合器。 CDW-超导异质结将被用来探索由于在这两个基态的竞争配对相互作用的邻近效应。初步的努力，以测试预测的性能介观CDW绝缘体CDW和正常的金属绝缘体CDW异质结构也将进行。 这项研究项目是跨学科的性质，将涉及 研究生和本科生， 将 受过良好的工业、政府和学院职业培训。 %%% 这个实验项目是基于新的和潜在的有用的 "电荷密度波"导体的电子导电膜。 在这些材料中， 非常各向异性， 通常是针状的， 导电以与普通金属如铜和铝完全不同的方式发生。 在这些指挥者中， 运动 电荷携带 "网域" 提供传导，具有许多新颖的和潜在有用的特性。在这个项目中，这种材料的薄膜，适合 用于结合到电子设备配置中，例如用于高频通信设备的"混频器"，将被制造和研究。这种薄膜的异质结在某些情况下类似于硅器件技术中众所周知的"MOSFET"结构，并将探索其新颖的特性。这项工作将导致更好地了解传统金属和绝缘体之间的界面和新的电荷密度波导体的电行为，并可能导致在电子学中的新应用。 这个研究项目是跨学科的性质，将涉及本科生和研究生谁将在工业，政府和学术界的职位训练有素。 ***

w:\awards\awards96\num.doc Thorne 9705433 This experimental project focuses on the properties of interfaces involving thin films of novel charge-density wave (CDW) conductors, including Rb0.3MoO3. Materials of this class are among the most remarkable conducting materials ever discovered, and have many novel and potentially useful properties. In part the work will build upon the recent demonstration by van der Zant et al at the Delft University of Technology, that thin films of CDW conductors can be prepared, patterned and characterized, which indeed demonstrate the novel and potentially useful CDW phenomena. Collaboration with this group and the Buhrman group at Cornell will explore pulsed laser depostion of these materials. Methods for patterning and for attaching contacts to indvidual grains, and for preparing heterostructures with other materials will be investigated. These films make possible a broad variety of experiments to probe mesoscale aspects of CDW physics, and several such experiments are planned. In addition, memory devices based on metastable CDW states will be fabricated and characterized. Mesoscopic structures will be used to study CDW phase slip and vortex dynamics. MOSFET-like heterostructures will allow modulation of the CDW wavevector, gap and collective conductance. Such devices may be useful as detectors and mixers. CDW-superconductor heterostructures will be used to explore proximity effects due to the competing pairing interactions in these two ground states. Preliminary efforts to test predictions for the properties of mesoscale CDW-insulator-CDW and normal metal-insulator-CDW heterostructures will also be undertaken. This research project is interdisciplinary in nature and will involve graduate and undergraduate students who will be excellently trained for careers in industry, government and a cademia. %%% This experimental project is based on novel and potentially useful electronic conducting films of "charge-density-wave" conductors. In these materials, which are typically very anisotropic, often needle-like in their shape, electrical conduction occurs in a completely different way than in common metals such as copper and aluminum. In these conductors a cooperative motion of charge-carrying "domains" provides conduction, with many novel and potentially useful properties. In this project, thin films of such materials, suitable for incorporation into electronic device configurations, such as "mixers" of use in high frequency communication equipment, will be fabricated and studied. Heterojunctions of such films will resemble in some cases the "MOSFET" structures well known in the silicon device technology, and will be explored for their novel properties. This work will lead to a much better understanding of the electrical behavior of interfaces between conventional metals and insulators and the novel charge-density-wave conductors, and will possibly lead to new applications in electronics. This research project is interdisciplinary in nature and will involve undergraduate and graduate students who will be excellently trained for positions in industry, government and academia. ***