Weyl nodal loop semimetals (WNLs) host a closed nodal line loop Fermi surface in the bulk, protected zero-energy flat band, or drumhead, surface states, and strong spin-polarization. The large density of states of the drumhead states makes WNL semimetals exceedingly prone to electronic ordering. At the same time, the spin-polarization naively prevents conventional superconductivity due to its spin-singlet nature. Here we show the complete opposite: WNLs are extremely promising materials for superconducting Josephson junctions, entirely due to odd-frequency superconductivity. By sandwiching a WNL between two conventional superconductors we theoretically demonstrate the presence of very large Josephson currents, even up to orders of magnitude larger than for normal metals. The large currents are generated both by an efficient transformation of spin-singlet pairs into odd-frequency spin-triplet pairing by the Weyl dispersion and the drumhead states ensuring exceptionally proximity effect. As a result, WNL Josephson junctions offer unique possibilities for detecting and exploring odd-frequency superconductivity.

Weyl节点环半金属（WNL）在主体中具有闭合的节点线环费米表面，具有受保护的零能平带或鼓面，表面态，并具有强自旋极化作用。鼓面状态的高密度状态使得WNL半金属极易受到电子订购的影响。同时，自旋极化由于其自旋单峰性质而天真地防止了常规的超导性。在这里，我们显示出完全相反的事实：WNL是超导约瑟夫逊结的极有希望的材料，这完全归功于奇频超导性。通过将WNL夹在两个常规超导体之间，我们从理论上证明了存在非常大的约瑟夫森电流，甚至比普通金属还要大几个数量级。大电流是通过Weyl色散有效地将自旋-小双对转换为奇频自旋三联体而产生的，而鼓面状态则确保了异常的邻近效应。结果，WNL约瑟夫逊结为检测和探索奇频超导性提供了独特的可能性。