Large Josephson current in Weyl nodal loop semimetals due to odd-frequency superconductivity

Abstract

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.

arXiv comment4 figures + 11 supplementary figures

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Cited by in corpus (13)

• Theory of Majorana zero modes in unconventional superconductors
• Josephson effect and odd-frequency pairing in superconducting junctions with unconventional magnets
• Superconductivity in spin-$3/2$ systems: symmetry classification, odd-frequency pairs, and Bogoliubov Fermi surfaces
• Dia- and paramagnetic Meissner effect from odd-frequency pairing in multi-orbital superconductors
• Thermoelectricity carried by proximity-induced odd-frequency pairing in ferromagnet/superconductor junctions
• Odd-frequency pair density wave correlations in underdoped cuprates
• Edge-induced pairing states in a Josephson junction through a spin-polarized quantum anomalous Hall insulator
• Odd-frequency superconducting pairing due to multiple Majorana edge modes in driven topological superconductors
• Multi higher-order Dirac and nodal line semimetals
• Direct detection of odd-frequency superconductivity via time- and angle-resolved photoelectron fluctuation spectroscopy
• Surface induced odd-frequency spin-triplet superconductivity as a veritable signature of Majorana bound states
• Interfaces of nodal-line semimetals: drum states, transport and refraction
• Eight-fold classification of superconducting orders