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Perfect superconducting diode effect in altermagnets
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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.
Forward citations
Cited by 3 Pith papers
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Proximity-induced superconductivity and emerging topological phases in altermagnet-based heterostructures
Theoretical derivation of proximity-induced even-parity pairings in d-wave altermagnets coupled to s-wave superconductors, and emergence of weak and strong topological phases when Rashba SOC is included.
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Enhanced Superconducting Diode Effect in the Asymmetric Hatsugai-Kohmoto Model
Hatsugai-Kohmoto interactions enhance the quality factor of the superconducting diode effect in asymmetric band metals.
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Enhanced Superconducting Diode Effect in the Asymmetric Hatsugai-Kohmoto Model
In an asymmetric-band model with momentum-local repulsion, increasing the interaction from U=0 to U=4 raises the superconducting diode efficiency from 4.6% to 19%.
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