Development of an Ultralow Temperature Scanning Probe Microscopy System for Magnetic and Electrostatic Imaging

9975611范哈林根这笔赠款将提供部分支持的先进系统的实验，解决关键的科学问题，在非常规超导体的研究，介观结构，和二维电子气的发展。 扫描探针显微镜（SPM）的发明和快速发展是技术驱动科学的最新例子。这些创新工具正在改变我们对纳米尺度物质结构和性质的看法。 从半导体到生物样品再到自组装设备，现在可以对各种材料进行非常小尺度的成像。 因此，这些显微镜正在成为凝聚态物理学、先进存储设备和生物学等不同学科的科学研究和技术发展的重要工具。 新系统将把扫描探针显微镜用于磁和静电成像的应用扩展到超低温和高磁场下，用于研究凝聚态系统中的基本现象。开发的系统将把一些最先进的SPM方法用于测量局部磁场和电场，并与一个多功能的顶部加载稀释制冷机相结合。 特别是，将在超低温下实施扫描SQUID（超导量子干涉器件），扫描霍尔和扫描电容显微镜技术，以实现微观尺度上的磁性和静电成像。 这些技术将允许在10-100纳米的长度尺度上绘制静电场和磁场，温度低至20毫开尔文，场高达10特斯拉。 该计划将是UIUC的两个团队之间的合作努力，这两个团队在扫描探针显微镜方面具有专业知识，并且在低温下研究超导体和介观结构的基本现象方面具有共同的兴趣和当前NSF的支持。使用该仪器进行的实验将阐明广泛的低温现象的性质，并为新的和令人兴奋的发现提供机会。 最初的研究计划包括实验揭示二维超导体中量子相变的本质，探测非常规超导体中涡旋晶格的结构，并在介观结构中寻找非常规超导材料中序参量的脆弱性导致的次级超导相。该计划还将影响正在进行的培养学生扫描探针的教育计划显微镜和纳米成像。 这些技术开始影响数据存储和未来设备技术领域的工业发展，这些领域仍然是工业领域凝聚态物理学家的最大雇主。这些设备将使调查人员能够对新的材料类别进行非常基本的研究，并在非常需要的领域进行培训研究。

9975611Van HarlingenThis grant will provide partial support for the development of an advanced system to experiments that address key scientific issues in the study of unconventional superconductors, mesoscopic structures, and the two-dimensional electron gas. The invention and rapid advance of scanning probe microscopies (SPM) is a recent example of technology driving science. These innovative tools are changing our perception of the structure and properties of matter on nanometer scales. Imaging at very small-length scales is now possible for all kinds of materials, from semiconductors to biological samples to self-assembled devices. As a result, these microscopes are becoming essential tools to scientific research and technological development in diverse disciplines - condensed matter physics, advanced memory devices, and biology. The new system will extend the use of scanning probe microscopy for magnetic and electrostatic imaging to ultralow temperatures and high magnetic fields for the study of fundamental phenomena in condensed matter systems.The developed system will integrate some of the most advanced methods of SPM for measuring local magnetic and electric fields with a versatile top loading dilution refrigerator. In particular, scanning SQUID (Superconducting Quantum Interference Device), scanning Hall, and scanning capacitance microscopy techniques at ultralow temperatures will be implemented to achieve magnetic and electrostatic imaging on the microscopic scale. These techniques will allow mapping of electrostatic and magnetic fields on length scales of 10-100 nanometers at temperatures down to 20 millikelvin and fields up to 10 Tesla. This program will be a collaborative effort between two groups at UIUC with expertise in scanning probe microscopy and shared interest and current NSF support in studying fundamental phenomena in superconductors and mesoscopic structures at low temperatures.The experiments performed with this instrumentation will elucidate the nature of a wide range of low temperature phenomena and provide opportunities for new and exciting discoveries. The initial research plan includes experiments unraveling the nature of quantum phase transitions in two-dimensional superconductors, probing the structures of vortex lattices in unconventional superconductors, and search for secondary superconducting phases in mesoscopic structures resulting from the fragility of the order parameter in unconventional superconducting materials.This program will also impact the ongoing educational plans for the training of students in scanning probe microscopy and nanoscale imaging. These techniques are beginning to impact industrial development in the areas of data storage and future device technology, which remains the largest employers of condensed matter physicists in the industrial sector.%%%This equipment will enable the investigators to undertake very fundamental studies on new classes of materials, and to train studies in a very needy area.***