The surface density of states of layered {\it f}-electron materials

Abstract

We theoretically analyze the surface density of states of heavy fermion materials such as CeCoIn${}_5$. Recent experimental progress made it possible to locally probe the formation of heavy quasi-particles in these systems via scanning tunneling microscopy, in which strongly temperature-dependent resonances at the Fermi energy have been observed. The shape of these resonances varies depending on the surface layer, i.e. if Cerium or Cobalt terminates the sample. We clarify the microscopic origin of this difference by taking into account the layered structure of the material. Our simple model explains all the characteristic properties observed experimentally, such as a layer-dependent shape of the resonance at the Fermi energy, displaying a hybridization gap for the Cerium-layer and a peak or dip structure for the other layers. Our proposal resolves the seemingly unphysical assumptions in the preceding analysis based on the two-channel cotunneling model.

4 pages

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Cited by in corpus (5)

• Spin Density Waves in the Hubbard model - A DMFT approach
• Theory of Scanning Tunneling Spectroscopy: from Kondo Impurities to Heavy Fermion Materials
• Effects of an Additional Conduction Band on Singlet-Antiferromagnet Competition in the Periodic Anderson Model
• Spectral changes in layered $f$-electron systems induced by Kondo hole substitution in the boundary-layer
• Degenerate orbital effect in a three orbital periodic Anderson model