Figure 2
Energy vs momentum dispersion from second derivatives of the intensity map and EDC fits. (a) The second derivative of ARPES data shown in Fig. 1 to enhance the visibility of weak features away from the
point, particularly for
Å
. The white dashed box indicates the blown-up region shown in (c), where the dispersion relation extracted from EDC fits of Fig. 1b, as exemplified in (b), is presented. The fits are made with two Lorentzian peaks added by an exponential background to account for the tail from the high binding energy peak, which is then multiplied by the Fermi function and convoluted by a Gaussian to include the experimental resolution. Samples of the fit are shown in (b) for
,
, and 0.02 Å
. In (c), blue (gray) and green (light gray) shades are added as guides to the eyes for the flat and dispersing features, respectively. Blue (gray) lines show the best fit of the dispersion relation using the slave boson treatment of the periodic Anderson model (Ref.
16). (d) A schematic diagram explaining the energy-momentum dispersion relation of the
-
hybridized state (red curves) close to
under a periodic Anderson model (see, for example, Refs.
4 and
15), with a schematic representation of the spectral weight of states of
character. The thicker part of the curves implies a higher intensity in the spectral function.
denotes the energy level of the renormalized
state and
(black dashed line) is the bare dispersion of the original
band. Note that the position of the
lies below
following the electron-hole symmetry of Ce and Yb systems.
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