Perfect Superconducting Diode Effect in Altermagnets

Debmalya Chakraborty; Annica M. Black-Schaffer

doi:10.1103/cv8s-tk4c

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Perfect Superconducting Diode Effect in Altermagnets

Debmalya Chakraborty, Annica M. Black-Schaffer

DOI 10.1103/cv8s-tk4c · Physical Review Letters

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Abstract

We investigate intrinsic superconducting diode effect in the unconventional superconducting state of d-wave altermagnets. We find large diode efficiencies in the wide-reaching finite-momentum pairing regimes of the phase diagram. Remarkably, even perfect diode efficiency of 100% can be obtained in the presence of an external magnetic field. We attribute the largest efficiencies to competition between multiple zero-momentum (BCS) and finite-momentum superconducting states, which is connected to a topological nodal-to-nodeless transition in altermagnets with magnetic field, making our results applicable to a wide range of altermagnets.