Non-Abrikosov vortex and topological knot in two-gap superconductors

Y. M. Cho; Pengming Zhang

doi:10.1103/PhysRevB.73.180506

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Non-Abrikosov vortex and topological knot in two-gap superconductors

Y. M. Cho, Pengming Zhang

DOI 10.1103/PhysRevB.73.180506 · Physical Review B

T1

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Abstract

We establish the existence of a topologically stable knot in a two-gap superconductor whose topology π3(S2) is fixed by the Chern-Simon index of the electromagnetic potential. We present a helical magnetic vortex solution in a Ginzburg-Landau theory of a two-gap superconductor which has a nonvanishing condensate at the core, and identify the knot as a twisted magnetic vortex ring made of the helical vortex. We discuss how the knot can be constructed in the recent two-gap MgB2 superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown