Intermediate bosonic metallic state in the superconductor-insulator transition

• DOI: 10.1126/science.aax5798
• Publication Date: 2019-11-15T00:15:41Z
• Authors: Chao Yang; Yi Liu; Yang Wang; Liu Feng; Qianmei He; Jian Sun; Yue Tang; Chunchun Wu; Jie Xiong; Wanli Zhang; Xi Lin; Hong Yao; Haiwen Liu; Gustavo Fernandes; Jimmy Xu; James M. Valles; Jian Wang; Yanrong Li
• Keywords: Phase coherence; Oscillation (cell signaling); Metal–insulator transition

After decades of explorations, suffering from low critical temperature and subtle nature, whether a metallic ground state exists in two-dimensional system beyond Anderson localization is still mystery. Supremely, phase coherence could be the key that unlocks its intriguing nature. This work reveals how quantum evolves across bosonic superconductor-metal-insulator transitions via magneto-conductance oscillations high-Tc superconducting films. A robust intervening anomalous characterized by both resistance oscillation amplitude saturations regime detected. By contrast, with decreasing monotonically grows on side, but decreases at temperatures insulating side. It suggests saturation plays prominent role formation this state.