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• W3144078734 abstract "A recent experiment reported two new noncentrosymmetric superconductors $mathrm{Nb}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ and $mathrm{Ta}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ with respective superconducting transition temperatures of 7.2 and 5.2 K and further suggested their superconductivity to be unconventional [K. G'ornicka et al., Adv. Funct. Mater. 31, 2007960 (2021)]. Here, based on first-principles calculations and symmetry analysis, we propose that $T{mathrm{Ir}}_{2}{mathrm{B}}_{2}phantom{rule{0.28em}{0ex}}(T=mathrm{Nb},mathrm{Ta})$ are topological Weyl metals in the normal state. In the absence of spin-orbit coupling (SOC), we find that $mathrm{Nb}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ has 12 Weyl points, and $mathrm{Ta}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ has four Weyl points, i.e., the minimum number under time-reversal symmetry; meanwhile, both of them have a nodal net composed of three nodal lines. In the presence of SOC, a nodal loop on the mirror plane evolves into two hourglass Weyl rings, along with the Weyl points, which are dictated by the nonsymmorphic glide mirror symmetry. Besides the rings, $mathrm{Nb}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ and $mathrm{Ta}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ have 16 and 20 pairs of Weyl points, respectively. The surface Fermi arcs are explicitly demonstrated. On the (110) surface of $mathrm{Ta}{mathrm{Ir}}_{2}{mathrm{B}}_{2}$, we find extremely long surface Fermi arcs ($ensuremath{sim}0.6phantom{rule{0.28em}{0ex}}{AA{}}^{ensuremath{-}1}$) located 1.4 meV below the Fermi level, which should be readily probed in experiment. Combined with the intrinsic superconductivity and the nontrivial bulk Fermi surfaces, $T{mathrm{Ir}}_{2}{mathrm{B}}_{2}$ may, thus, provide a very promising platform to explore the three-dimensional topological superconductivity." @default.
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• W3144078734 date "2021-03-26" @default.
• W3144078734 modified "2023-10-17" @default.
• W3144078734 title "Topological properties of noncentrosymmetric superconductors TIr2B2 ( T=Nb,Ta )" @default.
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• W3144078734 doi "https://doi.org/10.1103/physrevb.103.125154" @default.
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