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Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) The “universal curve” for surface sensitivity in photoemission (Ref. 4). Electron inelastic mean free paths from a variety of materials are plotted vs the kinetic energy relative to (the lowest kinetic energies shown will not be able to overcome the work function). Indicated on the plot are the kinetic energy ranges for standard ARPES and laser ARPES.

Image of FIG. 2.
FIG. 2.

(Color online) Schematic layout of the 6 eV laser system. All lenses have a 5 cm focal length and are ultraviolet (UV) fused silica where necessary. Dichroic mirrors are shown in dark green.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Typical fourth harmonic spectrum (open circles) and Gaussian fit (solid line). (b) Raw photoemission spectrum from polycrystalline gold at (open circles) and Fermi-Dirac function fit (solid line).

Image of FIG. 4.
FIG. 4.

(Color online) Rotatable ARPES calibration device. Electrons are photoemitted from the face of the small gold post and a shadow pattern is generated as some electrons are blocked by the wire array on their way to the analyzer. The blue line represents light incident on the gold sample.

Image of FIG. 5.
FIG. 5.

(Color online) ARPES image of the angular calibration device taken using 6 eV laser photons.

Image of FIG. 6.
FIG. 6.

(Color online) Comparison of nodal ARPES data from optimally doped Bi2212 taken with (a) 6 eV photons at , (b) 28 eV photons at , and (c) 52 eV photons at . The MDC derived dispersion for the 6 eV data is shown on all three panels (open red circles), and the dispersion for the 28 eV (blue squares) and 52 eV (black triangles) data are on panels (b) and (c), respectively. Because of the high flux of the laser, the data of panel (a) was acquired in less than 2 min.

Image of FIG. 7.
FIG. 7.

(Color online) Comparison of EDCs at (a) and MDCs at for the data of Fig. 6.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy