Quantum phase transitions in superconducting arrays under external magnetic fields

  title={Quantum phase transitions in superconducting arrays under external magnetic fields},
  author={Beom Jun Kim and Gun Sang Jeon and M.-S. Choi and M.Y. Choi},
  journal={Physical Review B},
We study the zero-temperature phase transitions of two-dimensional superconducting arrays with both the self- and the junction capacitances in the presence of external magnetic fields. We consider two kinds of excitations from the Mott insulating phase, charge-dipole excitations and single-charge excitations, and apply the second-order perturbation theory to find their energies. The resulting phase boundaries are found to depend strongly on the magnetic frustration, which measures the… 
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