期刊
PHYSICAL REVIEW B
卷 103, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.104504
关键词
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资金
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-SC0017632]
- University of Wisconsin-Milwaukee through the Distinguished Graduate School Fellowship
- Marsden Fund Council
UTe2 is a likely spin-triplet superconductor with evidence for chiral Majorana edge states. It features inversion-symmetry related pairs of U atoms forming rungs of ladders. Each rung's two sublattice degrees of freedom play a key role in understanding the electronic structure and the origin of superconductivity.
UTe2 is a likely spin-triplet superconductor that also exhibits evidence for chiral Majorana edge states. A characteristic structural feature of UTe2 is inversion-symmetry related pairs of U atoms, forming rungs of ladders. Here we show how each rung's two sublattice degrees of freedom play a key role in understanding the electronic structure and the origin of superconductivity. In particular, DFT+U calculations generically reveal a topological band near the chemical potential originating from a band inversion associated with 5 f electrons residing on these rungs, necessitating a microscopic description that includes these rung degrees of freedom. Furthermore, we show that a previously identified strong ferromagnetic interaction within a U-U rung leads to a pseudospin-triplet superconducting state that accounts for a nonzero polar Kerr angle, the observed magnetic field-temperature phase diagrams, and nodalWeyl fermions. Our analysis may also be relevant for other U-based superconductors.
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