Controlling vortex motion and THz radiation in high temperature superconductors.

在过去的五年里，我一直专注于涡旋动力学的非常“热门”的话题——a . Abrikosov博士在2003年因发现II型超导体中的涡旋晶格而获得诺贝尔奖。与通常研究涡旋动力学本身的方法不同，我集中研究如何在纳米器件中操纵涡旋。该提案基于我最近的研究，包含两个主要主题：(i)如何操纵棘轮装置中的涡流，（ii）如何使用层状超导体中的约瑟夫森涡流产生，过滤，检测或放大太赫兹辐射。这两个主题都是最近的涡旋会议（2005年国际涡旋研讨会http://www.tifr.res.in/~ivw10/在印度，涡旋IV http://fys.kuleuven.be/vsm/projects/nes/Vortex%20IV%20abstractbook.pdf在克里特岛，ISS筑波，2005 http://www.istec.or.jp/ISS/在日本）的关键主题，我今年在这些会议上发表了三次邀请演讲。我有足够的经验来解决这个问题，因为一方面，我与顶级专家（Fabio Marchesoni教授，Peter Hnggi教授）在嘈杂环境中随机过程和小颗粒输运理论方面合作了四年，另一方面，我也研究了涡旋动力学（与L. Fisher教授，A. Rakhmanov教授，K. Kadowaki教授，F. Nori教授，A. Maeda教授，S. Bending教授）十多年。拟议研究的两个主题对于应用都非常重要：(i) Dr. R. underberger通过实验表明，当使用棘轮装置去除涡流时，SQUID的灵敏度会大大增加；（二）太赫兹辐射的控制对天文学、化学、生物学和医学的各种应用非常重要，包括太赫兹成像、光谱学、断层扫描、医学诊断、健康监测、环境控制以及化学和生物鉴定。因此，这个项目，特别是由于与实验学家的合作，可以导致新的涡旋棘轮和太赫兹设备的发展，因此，对提高生活质量有很大的影响。与涡旋动力学和棘轮输运专家合作的可能性。S. Bending， S. Gordeev博士)以及非线性光学和光子晶体（David Bird教授，Dmitry Skryabin博士和太赫兹技术小组）促使我选择主办组织。

During last five years I have focused on the very 'hot' topic of vortex dynamics --- Dr. A. Abrikosov got a Nobel Prize in 2003 for discovering the vortex lattice in type II superconductors. In contrast to a usual approach of studying vortex dynamics itself, I have concentrated on how to manipulate vortices in nano-devices. This proposal is based on my recent research and contains two main themes: (i) how to manipulate vortices in ratchet devices, (ii) how to generate, filter, detect, or amplify THz radiation using Josephson vortices in layered superconductors. Both of these topics were key subjects at recent vortex conferences (International Vortex Workshop 2005 http://www.tifr.res.in/~ivw10/ in India, VORTEX IV http://fys.kuleuven.be/vsm/projects/nes/Vortex%20IV%20abstractbook.pdf in Crete, ISS Tsukuba, 2005 http://www.istec.or.jp/ISS/ in Japan), at which I presented three invited talks this year. I have adequate experience to solve this problem because, on one hand, I have worked with top-experts (Prof. Fabio Marchesoni, Prof. Peter Hnggi) on the theory of stochastic processes and transport of small particles in noisy environments for four years and, on the other hand, I have also studied vortex dynamics (with Prof. L. Fisher, Prof. A. Rakhmanov, Prof. K. Kadowaki, Prof. F. Nori, Prof. A. Maeda, Prof. S. Bending) for more than ten years. Both themes of the proposed research are very important for applications: (i) it has been experimentally shown by Dr. R. Wnderberger that SQUID sensitivity strongly increases when using a ratchet device to remove vortices; (ii) the control of THz radiation is very important for various applications in astronomy, chemistry, biology and medicine, including THz imaging, spectroscopy, tomography, medical diagnosis, health monitoring, environmental control, as well as chemical and biological identification. Thus, this project, especially thanks to collaboration with experimentalists, can result in the development of new vortex ratchet & THz devices and, thus, have a big impact in improving the quality of life. The possibility of collaborating with experts on vortex dynamics and ratchet transport (Profs. S. Bending, Dr. S. Gordeev) and in nonlinear optics and photonic crystals (Prof. David Bird, Dr Dmitry Skryabin and the terahertz technology group) motivates my choice of the host organization.