Fig. 5: Fabrication of twisted WTe2 double-barrier JJ. | Nature Communications

Fig. 5: Fabrication of twisted WTe2 double-barrier JJ.

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

Fig. 5

a Schematic diagram of a NbSe2/twisted-WTe2 double-barrier/NbSe2 vdW vertical JJ. b magnified schematic of the crystal structure of the twisted-WTe2 double-barrier. Notably, the vector addition of the internal crystal fields εcr_Top and εcr_Bottom of the top and bottom WTe2 layers, respectively, with the twist angel θtwist leads to a new artificial polar axis of the entire Josephson barrier. c Optical micrograph of the twisted-WTe2 double-barrier JJ. The top (bottom) WTe2 flake is marked by the red (green) dashed line. εcr_Top (εcr_Bottom) is defined to be along the polar axis (b-axis) of the top (bottom) WTe2. These axes are directly probed by angle-resolved polarized Raman spectroscopy, as depicted on the optical micrograph. The black dashed box represents the area scanned by AFM as shown in (d). d AFM image of respective WTe2 barriers. Inset: depth profile along the red solid line.

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