Quest for Band Renormalization and Self-Energy in Correlated f-Electron Systems

T. Durakiewicza, P.S. Riseboroughb, C.D. Batistaa, Y.-F. Yanga, P.M. Oppeneerc, J.J. Joycea, E.D. Bauera and K.S. Grahama a Los Alamos National Laboratory, Condensed Matter and Thermal Physics Group, Mailstop K764, Los Alamos, NM 87545, USA b Department of Physics, Temple University - Philadelphia, PA 19122, USA c Department of Physics and Materials Science, Uppsala University - Box 530, S-75121, Uppsala, Sweden

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Coexisting low-energy scales are observed in f-electron materials. The information about some of low-energy scales is imprinted in the electron self-energy, which can be measured by angle-resolved photoemission (ARPES). Such measurements in d-electron materials over the last decade were based on high energy- and momentum- resolution ARPES techniques used to extract the self-energy information from measured spectra. Simultaneously, many-body theoretical approaches have been developed to find a link between the self-energy and many-body interactions. Here we show the transcription of such methods from d-electrons to f-electrons by presenting the first example of low energy scales in the f-electron material USb2, measured with synchrotron-based ARPES. The proposed approach will help in answering the fundamental questions about the complex nature of the heavy fermion state.

DOI: 10.12693/APhysPolA.117.264 PACS numbers: 79.60.-i, 71.28.+d, 74.25.Jb