Abstract/Details

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


2008 2008

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Abstract (summary)

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.

Indexing (details)


Subject
Condensation;
Optics
Classification
0611: Condensation
0752: Optics
Identifier / keyword
Pure sciences; ARPES; Laser; Photoemission; Spin; Superconductors; Ultrafast
Title
Angle resolved photoemission study on multi-layer high temperature superconductor and advances on photoemission spectroscopy
Author
Chen, Yulin
Number of pages
167
Publication year
2008
Degree date
2008
School code
0212
Source
DAI-B 69/05, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780549623915
Advisor
Chen, Zhi-Xun
University/institution
Stanford University
University location
United States -- California
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3313553
ProQuest document ID
304470917
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304470917
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