Quantum phase transition in an array of coupled superconducting quantum dots with charge frustration

Article

关键词: JOSEPHSON-JUNCTION ARRAYS;    INSULATOR TRANSITION;    MAGNETIC-FIELD;    UNIVERSAL RESISTANCE;    ONE-DIMENSION;    CHAINS;   

DOI  :  10.1103/PhysRevB.81.212505

来源: SCIE

【 摘 要 】

The quantum phase transition in two capacitively coupled arrays of superconducting quantum dots (SQD) by considering the presence of gate voltage in each superconducting island is presented. We show explicitly that the cotunneling process associated with two coupled SQD arrays, near the maximum-charge frustration line is not sufficient to explain the correct quantum phases with physically consistent phase boundaries. We consider an extra cotunneling process along each chain to explain the correct quantum phases with physically consistent phase boundaries. There is no evidence of supersolid phase in our study. The Bethe ansatz and Abelian bosonization method is used to solve the problem.

【 授权许可】

Free