Regular Article - Solid State and Materials
Fabry–Pérot interference in Josephson junctions
School of Physics, University of Hyderabad, Prof. C. R. Rao Road, Gachibowli, 500046, Hyderabad, India
Accepted: 16 August 2023
Published online: 25 August 2023
Conductance of metallic heterostructures can be controlled by applying a gate voltage to a region in the transport channel. For sufficiently long phase coherent channels, oscillations appear in conductance versus chemical potential plot, which can be explained by Fabry–Pérot interference. In this work, we study DC Josephson effect in a superconductor–normal metal–superconductor junctions. The chemical potential of the normal metal (NM) region can be tuned by an applied gate voltage. We numerically obtain the Andreev bound states formed within the superconducting gap and calculate Josephson current by summing up the currents carried by the occupied Andreev bound states. We find that the Josephson current oscillates as a function of the chemical potential in the NM region, and these oscillations can be explained by Fabry–Pérot interference condition. We find that Josephson current carried by one bound state can be higher than that carried by two or more bound states.
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