We compute the (0-11) surface spectral function, the surface density of states (DOS), and the quasiparticle interference (QPI) patterns, both in the normal state and superconducting (SC) state of UTe2. We consider all possible non-chiral and chiral order parameters (OPs) that could in principle describe the superconductivity in this compound. We describe the formation of surface states whose maximum intensity energy depends on the nature of the pairing. We study also the QPI patterns resulting from the scattering of these surface states. We show that the main feature distinguishing between various OPs is a QPI peak that is only observed experimentally in the superconducting state. The energy dispersion and the stability of this peak is consistent among the non-chiral OPs only with a B3u pairing. Moreover, B3u is the only non-chiral pairing that shows a peak at zero energy in the DOS, consistent with the experimental observations.
@article{arxiv.2503.17762,
title = {Quasiparticle interference and spectral function of the UTe$_2$ superconductive surface band},
author = {Adeline Crépieux and Emile Pangburn and Shuqiu Wang and Kuanysh Zhussupbekov and Joseph P. Carroll and Bin Hu and Qiangqiang Gu and J. C. Séamus Davis and Catherine Pépin and Cristina Bena},
journal= {arXiv preprint arXiv:2503.17762},
year = {2025}
}