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Josephson effects in twisted nodal superconductors

https://doi.org/10.1103/PhysRevB.111.014514

Volkov, Pavel_A; Zhao, S_Y_Frank; Poccia, Nicola; Cui, Xiaomeng; Kim, Philip; Pixley, J_H (January 2025, Physical Review B)
MACTA: A Multi-agent Reinforcement Learning Approach for Cache Timing Attacks and Detection

Jiaxun Cui, Xiaomeng Yang (February 2023, ICLR 2023)

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Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors

https://doi.org/10.1126/science.abl8371

Zhao, S. Y.; Cui, Xiaomeng; Volkov, Pavel A.; Yoo, Hyobin; Lee, Sangmin; Gardener, Jules A.; Akey, Austin J.; Engelke, Rebecca; Ronen, Yuval; Zhong, Ruidan; et al (December 2023, Science)

Twisted interfaces between stacked van der Waals (vdW) cuprate crystals present a platform for engineering superconducting order parameters by adjusting stacking angles. Using a cryogenic assembly technique, we construct twisted vdW Josephson junctions (JJs) at atomically sharp interfaces between Bi₂Sr₂CaCu₂O₈₊_xcrystals, with quality approaching the limit set by intrinsic JJs. Near 45° twist angle, we observe fractional Shapiro steps and Fraunhofer patterns, consistent with the existence of two degenerate Josephson ground states related by time-reversal symmetry (TRS). By programming the JJ current bias sequence, we controllably break TRS to place the JJ into either of the two ground states, realizing reversible Josephson diodes without external magnetic fields. Our results open a path to engineering topological devices at higher temperatures.
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Two-dimensional heavy fermions in the van der Waals metal CeSiI

https://doi.org/10.1038/s41586-023-06868-x

Posey, Victoria A.; Turkel, Simon; Rezaee, Mehdi; Devarakonda, Aravind; Kundu, Asish K.; Ong, Chin Shen; Thinel, Morgan; Chica, Daniel G.; Vitalone, Rocco A.; Jing, Ran; et al (January 2024, Nature)

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