U.S.-Austria Cooperative Research on Narrow Bandgap IV-VI Semiconductor Microstructures

该奖项将支持半导体微结构主题的合作研究。美国调查人员是布朗大学的阿尔托·努尔米科博士和菲利普·斯泰尔斯博士，以及波士顿大学的贝内特·戈德堡博士。奥地利的合作者是奥地利林茨大学皮草物理研究所的冈瑟·鲍尔教授。该项目的目标是探索基于窄禁带IV-VI化合物的新型半导体微结构。提出了一系列复杂的实验研究，重点是量子化磁场中的低维电子现象。具体地说，将通过光学和输运实验探针生长、制备和研究第四和第六列元素的组成和掺杂超晶格、异质结和其他微结构。对PbTe系统的重视是由于其固有的高载流子迁移率，易于掺杂，以及其他材料所不具备的高介电常数。这项研究将集中于确定当载流子之间的库仑能量与动能具有相同数量级时系统的不寻常的多体性质。他们还将通过创建在两个维度上限制载流子的成分和掺杂的异质结来研究这种相互作用的降维方面。将应用的实验工具是磁输运、带间和带内磁光以及瞬变光学探头。样品将在奥地利种植，并在波士顿大学和布朗大学制作图案。该项目将受益于美国和奥地利调查人员的互补专业知识以及他们过去成功合作的历史。

This award will support collaborative research on the topic of semiconductor microstructures. The US investigators are Dr. Arto Nurmikko and Dr.Phillip Stiles, Brown University, and Dr. Bennet Goldberg, Boston University. The Austrian collaborator is Professor Gunther Bauer, Institut fur Physik, University of Linz, Austria. The goal of the project is to explore novel semiconductor microstructures, based on Narrow bandgap IV-VI compounds. A range of sophisticated experimental studies are proposed, with emphasis on lower dimensional electronic phenomena in quantizing magnetic fields. Specifically, compositional and doping superlattices, hetero- junctions and other microstructures of column four and column six elements will be grown, fabricated and studied by optical and transport experimental probes. The emphasis on PbTe- based systems is due to the inherent high carrier mobilities, ease of doping, and large dielectric constant unavailable in other materials. The study will concentrate on determining the unusual many body properties of systems when the Coulomb energy between carriers is of the same order of magnitude as the kinetic energy. They will also examine the reduced dimensional aspects of this interaction, by creating compositional and doping heterojunctions which confine the carriers in two dimensions. The experimental tools to be applied are magneto-transport, interband and intraband magneto-optics, and transient optical probes. Samples will be grown in Austria and patterned at Boston University and Brown University. The project will benefit from the complementary expertise of the US and Austrian investigators and their past history of successful collaboration.