A New Spin on Photoemission Spectroscopy Page: 46 of 259
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spin-ARPES. As we will see, the main difficulty lies in the actual detection of spin polar-
ization; measuring whether an electron is spin-up or -down is not at all as straightforward
as it naively seems. For instance, current state-of-the-art spin polarimeters introduce an
efficiency reduction of ~ 10-4 to determine the spin polarization of a beam compared to
spin-integrated electron counting. With the additional loss of parallel energy and angle
detection of current ARPES instruments, spin-ARPES is a very inefficient process.
Motivated by the tremendous need for progress in spin-resolved instrumentation, I have
dedicated my Ph.D. work to the design and development of a novel instrument: the spin-
TOF spectrometer. This spectrometer aims to revolutionize spin-ARPES by achieving a
breakthrough in possible resolutions through a ~1000 times improvement in overall effi-
ciency, thereby expanding the frontiers of the field. This is accomplished by attacking the
above problems in two ways. First, a novel spin-polarimeter has been developed which
offers up to 100 times improved efficiency over the current state-of-the-art polarimeters.
Second, parallel energy detection is re-introduced to the spin-resolved experiment with the
development of a time-of-flight (TOF) based energy analyzer to work in concert with the
spin-polarimeter, introducing an extra factor of 10 gain in overall efficiency.
The thesis is organized as follows. Chapter 2 summarizes the experimental and the-
oretical details of the ARPES technique and describes the development of an advanced
in-lab ARPES setup. Chapter 3 discusses the extension of ARPES with spin-resolution,
reviews details of its experimental difficulties, and introduces how the spin-TOF will attack
these difficulties. Chapter 4 covers the development of the TOF electrostatic lens system
and Chapter 5 covers the development of the new spin polarimeter, including the basics of
spin-polarimetry and the physical principles of current instruments. Chapter 6 summarizes
the complete instrument and initial accomplishments. Chapter 7 concludes the thesis with
a summary of the work to come as well as a description of some of the exciting future
prospects for spin-ARPES with the spin-TOF.
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Jozwiak, Chris. A New Spin on Photoemission Spectroscopy, thesis or dissertation, December 1, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc1014237/m1/46/: accessed April 25, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.