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Perfect Superconducting Diode Effect in Altermagnets.

Debmalya Chakraborty¹, Annica M Black-Schaffer²

¹Indian Institute of Science Education and Research (IISER) Mohali, K. K. Birla Goa Campus, Birla Institute of Technology and Science-Pilani, Max Planck Institute for the Physics of Complex Systems, Uppsala University, Department of Physics and Astronomy, Box 516, S-751 20 Uppsala, Sweden; , Nöthnitzer Straße 38, 01187, Dresden, Germany; Department of Physics, NH-17B, Zuarinagar, Sancoale, Goa-403726, India; and Department of Physical Sciences, Sector 81, S.A.S. Nagar, Manauli PO 140306, India.

Physical Review Letters

|July 31, 2025

Summary

This summary is machine-generated.

We discovered a superconducting diode effect in d-wave altermagnets, achieving high efficiencies. Perfect diode efficiency was observed with an external magnetic field, linked to topological transitions.

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Area of Science:

Condensed Matter Physics
Quantum Materials Science

Background:

The superconducting diode effect (SDE) enables current rectification in superconductors.
Altermagnets, a class of magnetic materials, exhibit unique electronic properties due to their symmetry.
Unconventional superconductivity, like d-wave pairing, presents complex phenomena beyond conventional BCS theory.

Purpose of the Study:

To investigate the intrinsic superconducting diode effect (SDE) in d-wave altermagnets.
To explore the influence of finite-momentum pairing and external magnetic fields on SDE.
To understand the underlying mechanisms, including topological transitions, governing SDE in these materials.

Main Methods:

Theoretical investigation of the superconducting diode effect.
Analysis of d-wave altermagnet phase diagrams.
Modeling of superconducting states with zero-momentum (BCS) and finite-momentum pairing.
Examination of topological nodal-to-nodeless transitions.

Main Results:

Large diode efficiencies were observed in the finite-momentum pairing regimes of d-wave altermagnets.
Perfect diode efficiency (100%) was achieved in the presence of an external magnetic field.
The highest efficiencies correlate with the competition between zero-momentum and finite-momentum superconducting states.

Conclusions:

The intrinsic superconducting diode effect is significant in d-wave altermagnets.
External magnetic fields can induce perfect diode efficiency by tuning topological properties.
These findings offer a pathway for novel electronic devices based on altermagnetism and superconductivity.