Junction-free polarity-tunable superconducting diode effect enables XNOR logic operation

@misc{bera2026junctionfree,
  title = {{Junction-free polarity-tunable superconducting diode effect enables XNOR logic operation}},
  author = {Alapan Bera and Soumik Mukhopadhyay},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.09097},
  eprint = {2609.09097},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.09097},
  note = {CC BY-NC-SA 4.0},
}

TY  - UNPB
TI  - Junction-free polarity-tunable superconducting diode effect enables XNOR logic operation
AU  - Alapan Bera
AU  - Soumik Mukhopadhyay
PY  - 2026
DA  - 2026/09/08
PB  - arXiv
DO  - 10.48550/arxiv.2609.09097
UR  - https://arxiv.org/abs/2609.09097
AB  - The realization of the superconducting diode effect (SDE), characterized by non-reciprocal supercurrent, is a major step towards dissipationless logic circuits. A polarity-tunable superconducting diode with high diode efficiency primarily consists of Josephson-junction architectures that couple two superconducting regions via a weak link. Realizing an SDE without a weak-link junction would reduce fabrication complexity, lower electrical noise, and minimize dependence on junction quality. Here, we report an all-vdW, highly efficient, junction-free SDE in NbSe2, enabled by proximity-induced symmetry breaking from a strong uniaxial ferromagnet Fe3GeTe2 (F3GT). Superconducting diode efficiency of up to 30% is achieved at a small magnetic field of 50 mT. A field-free diode rectification effect is realized with diode polarity that is tunable by the F3GT spin polarization. Furthermore, by employing the active-field dependence of the SDE, a two-input exclusive-NOR (XNOR) logic gate operation is demonstrated. The findings highlight the potential utilization of magnetic proximity effect towards realizing junction-free superconducting diodes for high-performance, energy-efficient logic circuits.
ER  -