Chang-Jong Kang1,2*
1Department of Physics, Chungnam National University, Daejeon 34134, Korea
2Institute for Sciences of the Universe, Chungnam National University, Daejeon 34134, Korea
Abstract: The compound UTe2 has recently been shown to realize spin triplet superconductivity from a nonmagnetic normal state. This has sparked intense research activity, including theoretical analyses that suggest the superconducting order parameter to be topologically nontrivial. However, the underlying electronic band structure is a critical factor for these analyses, and remains poorly understood. Here, we present the electronic structure of UTe2 by using density functional theory plus dynamical mean-field theory (DFT+DMFT) calculations, revealing distinct Fermi-level features from two orthogonal quasi-one-dimensional light electron bands and one heavy band. Besides, we investigate the temperature-dependent optical conductivity of UTe2. These computations explain both high resolution angle-resolved photoemission and infrared spectroscopy measurements. We find that the coherent Kondo resonance is primarily associated with a collapse of scattering and less with a transfer of spectral weight.
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