2024/10/04 by Liu, Shouzheng, Wray, L. Andrew
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con)
paper · doi:10.48550/arxiv.2410.03840
The compound UTe2 is of great recent interest as a spin triplet superconductor that is thought to realize a topologically nontrivial superconducting order parameter. Though UTe2 is considered to be a heavy fermion material, only light-electron Fermi surfaces have been compellingly identified, while a possible heavy electron Fermi surface near the momentum space Z-point has been the subject of more speculative and incongruent interpretations based on density functional theory (DFT+U) and experimental measurements. Here we explore the DFT+U band structure within a tight binding model framework to identify emergence mechanisms for heavy fermion Fermi surfaces. Applying a Gutzweiller-like renormalization term to f-electron kinetics is found to distort the lowest energy f electron band from a saddle point to a local minimum at the Z-point, introducing a shallow Fermi pocket and greatly improving compatibility with recent experiments.