期刊
SCIENCE
卷 366, 期 6472, 页码 1505-+出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aax5798
关键词
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资金
- National Natural Science Foundation of China [11888101, 51722204, 11774008, 91421110, 11474175, 11674028, 11825404]
- National Key Research and Development Program of China [2018YFA0305604, 2015CB358600, 2017YFA0303300, 2016YFA0301001, 2017YFA0304600]
- Fundamental Research Funds for the Central Universities [ZYGX2016Z004]
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB28000000]
- Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics, Tsinghua University [KF201703]
- Beijing Natural Science Foundation [Z180010]
- Beijing Municipal Science and Technology Commission [Z181100004218001]
- China Postdoctoral Science Foundation [2019M650290]
Whether a metallic ground state exists in a two-dimensional system beyond Anderson localization remains an unresolved question. We studied how quantum phase coherence evolves across superconductor-metal-insulator transitions through magnetoconductance quantum oscillations in nanopatterned high-temperature superconducting films. We tuned the degree of phase coherence by varying the etching time of our films. Between the superconducting and insulating regimes, we detected a robust intervening anomalous metallic state characterized by saturating resistance and oscillation amplitude at low temperatures. Our measurements suggest that the anomalous metallic state is bosonic and that the saturation of phase coherence plays a prominent role in its formation.
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