Quantum coherence across bosonic superconductor-anomalous metal-insulator transitions

After decades of explorations, suffering from low critical temperature and subtle nature, whether a metallic ground state exists in a two-dimensional system beyond Anderson localization is still a mystery. Supremely, phase coherence could be the key that unlocks its intriguing nature. This work reve...

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Bibliographic Details
Published in:arXiv.org 2019-01
Main Authors: Yang, Chao, Liu, Yi, Wang, Yang, Liu, Feng, He, Qianmei, Sun, Jian, Tang, Yue, Wu, Chunchun, Xiong, Jie, Zhang, Wanli, lin, Xi, Yao, Hong, Liu, Haiwen, Fernandes, Gustavo, Xu, Jimmy, Valles, James M, Wang, Jian, Li, Yanrong
Format: Article
Language:English
Subjects:
Amplitudes
Anderson localization
Critical temperature
Insulators
Metal-insulator transition
Phase coherence
Quantum phenomena
Resistance
Superconducting films
Superconductivity
Temperature
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Summary:After decades of explorations, suffering from low critical temperature and subtle nature, whether a metallic ground state exists in a two-dimensional system beyond Anderson localization is still a mystery. Supremely, phase coherence could be the key that unlocks its intriguing nature. This work reveals how quantum phase coherence evolves across bosonic superconductor-metal-insulator transitions via magneto-conductance quantum oscillations in high-Tc superconducting films. A robust intervening anomalous metallic state characterized by both resistance and oscillation amplitude saturations in the low temperature regime is detected. By contrast, with decreasing temperature the oscillation amplitude monotonically grows on the superconducting side, but decreases at low temperatures on the insulating side. It suggests that the saturation of phase coherence plays a prominent role in the formation of this anomalous metallic state.
ISSN:2331-8422
DOI:10.48550/arxiv.1901.07706