Fig. 4: Thickness and temperature dependent Josephson supercurrent non-reciprocity. | Nature Communications

Fig. 4: Thickness and temperature dependent Josephson supercurrent non-reciprocity.

From: Intrinsic supercurrent non-reciprocity coupled to the crystal structure of a van der Waals Josephson barrier

Fig. 4

a Field-normalized Josephson diode efficiency \({\eta }^{*}\) (\(=\frac{{I}_{c}^{+}-\left|{I}_{c}^{-}\right|}{{I}_{c}^{+}+\left|{I}_{c}^{-}\right|}/{\mu }_{0}{H}_{{||}}\), measured at θMC = 90°) as a function of the Td-WTe2 barrier thickness. Vertical red and gray dashed lines correspond to the coherence length (Supplementary Information S4) and c-axis mean free path22 of the Td-WTe2. b Normalized dependence of \({\eta }^{*}\) as a function of normalized temperature T/Tc of NbSe2/Td-WTe2/NbSe2 Josephson junctions with different Td-WTe2 barrier thicknesses (2, 7, 23 and 60 nm). The Tc values of WTe2 JJs are 5.5 K (2 nm and 7 nm), 5 K (23 nm) and 1.5 K (60 nm), respectively. Solid lines represent fits to the data of \(\sqrt{1-\frac{T}{{T}_{c}}}\).

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