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Angle resolved photoemission study on multi-layer high temperature superconductor and advances on photoemission spectroscopy.

机译：多层高温超导体的角分辨光发射研究及光发射光谱学的进展。

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摘要

Photoemission spectroscopy (PES) has been established as one of the most important methods to study the electronic structure of molecules, solids and surfaces. It has widespread practical implications in various fields and has significantly contributed to the understanding of fundamental principles in solid state physics.;This thesis introduces two parts of my graduate research work, both related to the PES.;First part of the thesis presents the regular Angle Resolved PES (ARPES) study on a multi-layer high-Tc superconductor Ba2Ca3Cu 4O8F2, which would be predicted as a Mott insulator by conventional wisdom. We find that the electronic structure of this four layer material exhibits clear difference from either conventional hole- or electron-doped cuprate superconductors, making it exceptional to the well known high Tc superconductivity phase diagram. The duplex band structures, the self-doping behavior, the anomalous superconducting gaps and the multiple energy scales associated with its electronic structures not only demonstrate the complexity of this material, but also provide an excellent test example for high Tc superconductivity theories.;The second part of the thesis introduces important recent advances on PES and presents our newly developed Laser based Spin- and Time-Resolved ARPES spectrometer. This new experimental tool not only enables us to perform the spin polarization measurement on photoelectrons, but also provides the capability to perform electronic and spin dynamics measurement by pump-probe experiment scheme. These new capabilities open the door to so many possibilities and will greatly extend the research field of PES. The principle, construction, and commissioning results of the spectrometer are discussed in details, and various experimental proposals are also introduced.
机译：光发射光谱法（PES）已被确立为研究分子，固体和表面电子结构的最重要方法之一。它在各个领域都有着广泛的实践意义，并为理解固态物理学的基本原理做出了重要贡献。；本文介绍了我的研究生研究工作的两个部分，都与PES有关。多层高Tc超导体Ba2Ca3Cu 4O8F2的角度分辨PES（ARPES）研究，根据传统观点可将其预测为Mott绝缘体。我们发现，这种四层材料的电子结构与常规的空穴掺杂或电子掺杂的铜酸盐超导体表现出明显的差异，这使其与众所周知的高Tc超导相图不同。双相带结构，自掺杂行为，异常的超导间隙以及与其电子结构相关的多个能级，不仅证明了这种材料的复杂性，而且为高Tc超导理论提供了极好的测试实例。本文的一部分介绍了PES的最新进展，并介绍了我们最新开发的基于激光的自旋和时间分辨ARPES光谱仪。这种新的实验工具不仅使我们能够对光电子进行自旋极化测量，而且还具有通过泵浦探针实验方案进行电子和自旋动力学测量的能力。这些新功能为众多可能性打开了大门，并将极大地扩展PES的研究领域。详细讨论了光谱仪的原理，构造和调试结果，并介绍了各种实验方案。

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  • 作者

    Chen, Yulin.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Physics Condensed Matter.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 167 p.
  • 总页数 167
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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