2 B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Lenin Ave., Kharkov 61103, Ukraine
3 Department of Physics, Göteborg University, SE 41296 Göteborg , Sweden
Received April 23, 2008
Superconductivity induced phase-controlled mesoscopic magnetic effects in a two-dimensional electron gas that bridges two superconducting reservoirs are investigated. Giant paramagnetic response of the junction, occuring at certain values of the phase difference of the order parameter, is predicted. A geometrically
similar system, consisting of a graphene ribbon stretched between two superconducting leads, is also considered.
The magnetic effects in this system are found to be small and the difference between the magnetic properties of the two systems is discussed.
PACS: 73.63.Nm Quantum wires; PACS: 74.78.Na Mesoscopic and nanoscale systems; PACS: 74.45.+c Proximity effects; Andreev effect; SN and SNS junctions; PACS: 74.25.Bt Thermodynamic properties; PACS: 74.25.Ha Magnetic properties.