Phase diagram of 0- and pi-junction regimes of Josephson supercurrent is established for a double quantum dot in contact with two superconducting leads. An island of pi-phase appears in the range where all three competing interactions (superexchange, Kondo screening, superconductivity) are equally strong.
COBISS.SI-ID: 23965735
Substitutional Ag defects in the top-most atomic layer of the Cu(111) act as pinning centers for Co adatoms without affecting their electronic nor magnetic properties (the Kondo resonance remains essentially the same). The Ag impurities are hardly detectable in topographic imaging as they produce no standing-wave pattern and the dI/dV recorded above them is hardly different from that of the clean surface.
COBISS.SI-ID: 23629351