Pure Odd Frequency Superconductivity at the Cores of Proximity Vortices

Abstract

After more than a decade, direct observation of the odd frequency triplet pairing state in super- conducting hybrid structures remains elusive. We propose an experimentally feasible setup that can unambiguously reveal the zero energy peak due to proximity-induced equal spin superconducting triplet correlations. We theoretically investigate a two dimensional Josephson junction in the diffu- sive regime. The nanostructure consists of a normal metal sandwiched between two ferromagnetic layers with spiral magnetization patterns. By applying an external magnetic field perpendicular to the junction plane, vortices nucleate in the normal metal. The calculated energy and spatially resolved density of states, along with the pair potential, reveal that remarkably, only triplet Cooper pairs survive in the vortex cores. These isolated odd frequency triplet correlations result in well defined zero energy peaks in the local density of states that can be identified through tunneling spectroscopy experiments. Moreover, the diffusive regime considered here rules out the possibility of Andreev bound states in the vortex core as contributors to the zero energy peaks.

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• Fraunhofer response and supercurrent spin switching in black phosphorus with strain and disorder
• Self-biased current, magnetic interference response, and superconducting vortices in tilted Weyl semimetals with disorder
• Evolution of Pair Correlation Symmetries and Supercurrent Reversal in Tilted Weyl Semimetals
• Induced Energy Gap in Finite-Sized Superconductor/Ferromagnet Hybrids
• Universal two-time correlations, out-of-time-ordered correlators and Leggett-Garg inequality violation by edge Majorana fermion qubits
• Odd triplet superconductivity induced by the moving condensate
• Phase-dependent Spin Polarization of Cooper Pairs in Magnetic Josephson Junctions
• Dynamical regimes of ultrafast kinematic vortices in the resistive state of mesoscopic superconductors
• Local density of states in two-dimensional topological superconductors under a magnetic field: signature of an exterior Majorana bound state
• Strongly suppressed superconducting proximity effect and ferromagnetism in trilayers of $\mathrm{B}{\mathrm{i}}_2\mathrm{S}{\mathrm{e}}_3$ / $\mathrm{SrRu}{\mathrm{O}}_3$ / underdoped $\mathrm{YB}{\mathrm{a}}_2\mathrm{C}{\mathrm{u}}_3{\mathrm{O}}_{\mathrm{x}}$: A possible new platform for Majorana nano-electronics
• Selective equal spin Andreev reflection at vortex core center in magnetic semiconductor-superconductor heterostructure