Global k-space perspective of temperature-dependent U f-states in URu$_{2}$Si$_{2}$

In recent years, high-resolution angle-resolved photoemission (ARPES) measurements [1] have identified a narrow band of $f$-states close to the Fermi level in URu$_{2}$Si$_{2}$ whose temperature dependent spectral weight and/or energy shifts correlate to the hidden order transition at 17.5K. These $f$-states have been observed close to normal emission at a few select photon energies of $\sim$ 6, 21 and 30 eV corresponding to momentum space locations close to Z, $\Gamma $ and Z points respectively. We attempt to provide a more global $k$-space context for the presence of such $f$-states and their relation to the bulk Fermi surface topology using synchrotron-based wide-angle and photon energy-dependent ARPES mapping of the electronic structure. In addition, x-ray polarization and small-spot spatial dependences are exploited to assist identification of these narrow-band $f$-states and their relation to specific U- or Si-terminations of the cleaved surface.\\[4pt] [1] A.F. Santander-Syro, Nat. Phys. 2009; R. Yoshida, Phys. Rev. B 2010; G.L. Dakovski, Phys. Rev. B 2011.