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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.
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.
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