Nonequilibrium Transport in Very High Landau Levels of Quantum Hall Systems

*技术摘要*本项目将对在微波辐射或直流电场作用下脱离平衡态的砷化镓半导体纳米结构的电学性质进行实验研究。特别是，这种器件的电阻会随着外加磁场的作用而剧烈振荡，甚至在某些条件下会消失。通过探索微波和直流场诱导效应之间的异同，该项目将开发一种方法，以获得关于无序势的关联特性的详细信息，这将对其他领域产生直接影响，如高迁移率分子束外延生长。该项目的教育部分依赖于以研究为基础的教育资源的开发，以及各级和来自不同背景的学生直接参与尖端研究，为他们在纳米技术行业、政府和学术界的职业生涯做好准备。*非技术摘要*随着现代集成电路的小型化接近发挥量子效应的程度，了解半导体量子器件的电子性质变得越来越重要。这个项目将对半导体纳米结构的电子性质进行实验研究，这些结构在微波辐射或直流电场的作用下会脱离平衡状态。特别是，这种器件的电阻会随着外加磁场的作用而剧烈振荡，甚至在某些条件下会消失。通过探索微波和直流场诱导效应之间的异同，该项目将开发一种方法，以获得关于器件中杂质的数量和类型的详细信息，这将对其他领域产生直接影响，如高纯度半导体纳米结构的外延生长。该项目的教育部分依赖于以研究为基础的教育资源的开发，以及各级和来自不同背景的学生直接参与尖端研究，为他们在纳米技术行业、政府和学术界的职业生涯做好准备。

****Technical Abstract****This project will experimentally investigate electronic properties of GaAs-based semiconductor nanostructures which are driven out of their equilibrium state by microwave radiation or dc electric fields. In particular, electrical resistance of such a device can oscillate drastically with the applied magnetic field and even vanish under certain conditions. By exploring similarities and differences between microwave- and dc field-induced effects, the project will develop a method to obtain detailed information on the correlation properties of the disorder potential, which will have a direct impact on other fields, such as high-mobility MBE growth. The educational component of this project rests on the development of research-based educational resources and direct involvement of students at all levels and from a variety of backgrounds in cutting-edge research to ready them for careers in nanotechnology industry, government, and academe. ****Non-Technical Abstract****Understanding electronic properties of semiconductor quantum devices becomes increasingly important as miniaturization of modern integrated circuits approaches a point where quantum effects come into play. This project will experimentally investigate electronic properties of semiconductor nanostructures, which are driven out of their equilibrium state by microwave radiation or dc electric fields. In particular, electrical resistance of such a device can oscillate drastically with the applied magnetic field and even vanish under certain conditions. By exploring similarities and differences between microwave- and dc field-induced effects, the project will develop a method to obtain detailed information on the amount and type of impurities in the device, which will have a direct impact on other fields, such as epitaxial growth of high-purity semiconductor nanostructures. The educational component of this project rests on the development of research-based educational resources and direct involvement of students at all levels and from a variety of backgrounds in cutting-edge research to ready them for careers in nanotechnology industry, government, and academe.