Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.29: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Superconducting Diode Effect in Josephson Junction with Altermagnet — •Osamu Kanehira1, Yusuke Masaki1, and Hiroaki Matsueda1,2 — 1Department of Applied Physics, Tohoku University, Sendai, Japan. — 2Center for Science and Innovation in Spintronics, Tohoku University, Sendai, Japan.
Superconducting diode effects (SDEs) refer to a non-reciprocity in a critical current of superconductors (SCs). Since diodes are key building blocks for electronic devices, the SDE can be applied to superconducting electronic devices like quantum computers. However, in many experimental reports, the SDEs require a magnetic field or a magnetization of ferromagnets (FMs), although the magnetic field can have a bad effect on the superconducting devices.
To avoid this problem, we focus on an altermagnet (AM), which has no net magnetization like an antiferromagnet but has a spin-split band structure like the FM due to its crystal structure. In addition, SC/AM junctions show transport properties like those of SC/FM junctions, and thus the SC/AM junctions are expected to exhibit the field-free SDE without the magnetization and a stray field.
In this study, we theoretically investigate the SDE in an SC/AM/SC planar Josephson junction with Rashba SOC by the numerical calculation of the Josephson current. In the poster presentation, we will compare the results of the SC/AM/SC junction with those of the SC/FM/SC junction and discuss the advantages and disadvantages of the SC/AM/SC junction.
Keywords: Josephson junction; Superconducting diode effect; Altermagnet