Modulation of Josephson coupling and superconducting diode effect in twisted NbSe2/NbSe2 van der Waals junctions
Zhi-Hui Ren, Si-Li Wu, Hao-Chen Zhang, Xue-Tao Di, Wen-Yuan Jia, Yi-Xuan Li, Chong Wang, Mao-Yuan Wang, Chuan Li, Cai-Zhen Li, Zhi-Min Liao
DOI 10.1103/r5v6-75zk · Physical Review Applied
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Abstract
van der Waals (vdW) junctions provide a versatile platform to explore nonreciprocal superconducting phenomena, with the twist angle serving as a powerful knob to tune interfacial coupling and thereby modulate the superconducting diode effect (SDE). Here, we demonstrate twist-angle dependent modulation of Josephson coupling and the SDE in NbSe2/NbSe2 vdW junctions. By varying the twist angle, we observe a transition from a strongly coupled regime, characterized by large critical current density and a monotonic magnetic field dependence of critical current, to a weakly coupled regime with reduced critical current density and the emergence of a Fraunhofer pattern, indicative of a Josephson weak link. In the strongly coupled regime, the SDE efficiency remains below 1% within ±0.1 T, whereas in the weakly coupled regime it is markedly enhanced, reaching up to 10.4% at −35 mT. This distinct behavior reflects different microscopic origins of the SDE in the two coupling regimes. Our results reveal a direct correlation between interfacial coupling and SDE efficiency, opening avenues for twisted superconducting devices with customizable nonreciprocal functionalities.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NbSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.7 | Pressure not reported | unknown |
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