Disorder‐Induced Quantum Griffiths Singularity Revealed in an Artificial 2D Superconducting System

• DOI: 10.1002/advs.201902849
• Publication Date: 2020-09-18T09:41:47Z
• Authors: Xiaowen Han; Yufeng Wu; Hong Xiao; Miao Zhang; Min Gao; Yi Liu; Jian Wang; Tao Hu; Xiaoming Xie; Zengfeng Di
• Keywords: Van Hove singularity

Abstract Disorder‐induced Griffiths singularity of quantum phase transition (QPT) is a crucial issue in 2D superconductors (2DSC). In superconducting system, the strength disorder found to be associated with vortex pinning energy, which closely related singularity; however, direct study elucidate role energy on 2DSC remains undertaken. Here, an artificial system designed by randomly depositing nanoislands 2Delectron gas (2DEG). Quantum present graphene/Pb‐islands‐array hybrid, where behavior transits weakly localized metallic induced vertical magnetic field and exhibits critical diverging dynamical exponent approaching zero temperature. Compared graphene/Sn‐islands‐array hybrid sharp QPT observed, acquired from Arrhenius plot analysis greater may contribute presence singularity. This work provide comprehensive interpretation 2DSC.