A New Spin on Photoemission Spectroscopy Page: 98 of 259
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2 3 0 44E
Binding Energy (ev)
Figure 3.2. Spin-resolved resonant photoemission spectra from Bi2Sr2CaCu208+b at photon
energy hv = 931.1 eV, the Cu 2p3/2 absorption edge. (a)The total intensity spectrum is
the solid line, and the spectrum broken up into spin-triplet and -singlet components are
the square and triangle markers, respectively. (b) The measured spin polarization of the
resonant photoemission, used for the analysis of the singlet and triplet components. Figure
taken from ref. 21.
and a fairly large spin-orbit splitting of the Cu 2p core levels, spin polarized photoemission
is achieved. Analysis of the spin polarization then offers insight into the spin structure of
the initial state, in this case the spin-singlet and -triplet character of the spectrum, which
has impact on e typical starting point for theoretical models of the cuprate electronic
structure. Full interpretation involves analssnalysis of g the resonant photoemission
used to take advantage of the large spin-orbit splitting of the 2p levels, which is beyond
the scope of the thesis.98,99 A complete description of the experiment can be found in the
A brief look at the experimental results, however, is instructive and they are presented in
Figure 3.2. The total spin integrated EDC spectrum is shown by the solid line in panel (a).
The measured spin polarization resulting from the use of circularly polarized light and the
spin-orbit split core level is shown in panel (b). Through a fairly complicated interpretation
and analysis, 20 this polarization measurement is used to break down the solid line spectrum
in (a) into spin-singlet and -triplet components, shown by the square and triangle markers.
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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/m1/98/: accessed April 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.