Development of an Ultrahigh Resolution Photoemission System for Studies of Quantum Structures and Training of Students

9975182该奖项将为超高分辨率光电子分析系统的开发提供部分支持，该系统用于研究与量子结构相关的基本物理效应和现象的角分辨光电子发射。同步辐射中心（SRC）的一条新的波束线正在建设中，并计划于1999年初开始运行。这条光束线与最先进的正入射单色仪相结合，将在20 eV下以10,000的分辨率提供高达5 × 1012光子每秒的通量（对应于2 meV的能量分辨率，在较低能量下更好）。这代表了SRC目前使用的系统的数量级改进，并将为固体、表面、吸附剂、量子阱和薄膜系统的电子特性的详细研究提供机会。PI和co-PI是该光束线开发团队的成员。这笔拨款将为最先进的分析系统提供资金，该系统配备了一个二维位置敏感探测器，旨在同时收集高分辨率（3兆电子伏特和0.2度）的能量和角度相关数据。这将使在k空间中精确指定的点和在各种金属中非常接近费米能级的能量处检查准粒子线形成为可能，从而澄清与费米液体行为和电子相关效应有关的基本问题。许多来自其他机构的学生、博士后和科学家将使用该仪器。对学生和博士后的培训将包括使用同步辐射，最先进的分析仪，二维探测器系统，以及相关材料的制备和表征技术。该系统的开发将大大提高研究许多材料的基本光电现象和量子力学效应的能力，并为许多部门的就业培养大量学生。

9975182This award will provide partial support for the development of an ultrahigh-resolution photoelectron analyzer system for angle-resolved photoemission studies of basic physical effects and phenomena related to quantum structures. A new undulator beamline at the Synchrotron Radiation Center (SRC) is under construction, and is scheduled to begin operation in early 1999. This beamline, coupled to a state-of-the-art Normal Incidence Monochromator, will deliver a flux up to 5x10 12 photons per second at a resolving power of 10,000 at 20 eV (corresponding to an energy resolution of 2 meV, and better at lower energies). This represents orders of magnitude improvement over the systems currently in use at SRC, and will offer opportunities for detailed studies of the electronic properties of solids, surfaces, adsorbates, quantum wells, and thin film systems. The PI and co-PI are members of this beamline's development team. This grant will provide funds for a state-of-the-art analyzer system equipped with a two-dimensional position-sensitive detector designed for simultaneous collection of energy and angle dependent data at high resolution (3 meV and 0.2 degrees). This will enable the examination of quasiparticle lineshapes at precisely specified points in k space and at energies very close to the Fermi level in various metals, and thus to clarify basic issues related to the Fermi liquid behavior and electron correlation effects.Many students, postdocs, and scientists from other institutions will use the instrument. Training of students and postdocs will include the use of synchrotron radiation, a state-of-the-art analyzer, a two dimensional detector system, and related materials preparation and characterization techniques.&&&The system to be developed will significantly enhance the capability to investigate basic photoemission phenomena and quantum mechanical effects in many materials, and train a large number of students for careers in many sectors of the workforce.