Imaging the Fano lattice in the heavy fermion material URu$_{2}$Si$_{2}$ by scanning tunneling spectroscopy

We present scanning tunneling spectroscopy measurements of the heavy fermion material URu$_{2}$Si$_{2}$. Two dimensional differential conductance maps of mechanically cleaved surfaces reveal a narrow Fano lineshape about the Fermi level that is pervasive across the field of view. Such a lineshape is expected whenever a discrete energy level is coupled to a continuum of levels. By fitting the spectra to a Fano function, we produce maps showing the variation of the Fano parameters across the surface.