Kavli Affiliate: J. C. Seamus Davis
| First 5 Authors: Qiangqiang Gu, Shuqiu Wang, Joseph P. Carroll, Kuanysh Zhussupbekov, Christopher Broyles
| Summary:
Although nodal spin-triplet topological superconductivity appears probable in
UTe2, its superconductive order-parameter $Delta_k$ remains unestablished. In
theory, a distinctive identifier would be the existence of a superconductive
topological surface band (TSB), which could facilitate zero-energy Andreev
tunneling to an s-wave superconductor, and also distinguish a chiral from
non-chiral $Delta_k$ via enhanced s-wave proximity. Here we employ s-wave
superconductive scan-tips and detect intense zero-energy Andreev conductance at
the UTe2 (0-11) termination surface. Imaging reveals sub-gap quasiparticle
scattering interference signatures with a-axis orientation. The observed
zero-energy Andreev peak splitting with enhanced s-wave proximity, signifies
that $Delta_k$ of UTe2 is a non-chiral state: B1u, B2u or B3u. However, if the
quasiparticle scattering along the a-axis is internodal, then a non-chiral B3u
state is the most consistent for UTe2.
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