Merging diabolical points of a superconducting circuit
  We present the first theoretical study of the merging of diabolical points in the context of superconducting circuits. We begin by studying an analytically solvable four-level model which may serve as theoretical pattern for such a phenomenon. Then, we apply it to a circuit named Cooper pairs pump, whose diabolical points are already known. 
Am\'elie Monjou and Rapha\"el Leone
cond-mat.mes-hall