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

Abstract

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 momentumresolution 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.

Electron–phonon interaction and transport properties of metallic bulk and monolayer transition metal dichalcogenide TaS 2

“…At E F Σ = 0 and the volume of the interacting and non-interacting Fermi surface is conserved due to Luttingers theorem 54 . Similar findings have been observed in the f-electron material USb 2 , whereas renormalization due to electron-electron interaction was assumed there 57 . At elevating temperatures (( Fig.…”

“…At E F Σ = ′ 0 and the volume of the interacting and non-interacting Fermi surface is conserved due to Luttingers theorem [47]. Similar findings have been observed in the f-electron material USb 2 , whereas renormalization due to electron-electron interaction was assumed there [50]. At elevating temperatures (figures 5(b) and (c)) the pronounced features in the real part of Σ decrease and the bare band structure is almost recovered at room temperature.…”