Journal
SCIENCE
Volume 350, Issue 6260, Pages 542-545Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa7154
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Funding
- National Basic Research Program of China [2013CB934600, 2012CB921300, 2015CB921102]
- National Natural Science Foundation of China [11222434, 11174007, 11534001]
- Research Fund for the Doctoral Program of Higher Education (RFDP) of China
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The Griffiths singularity in a phase transition, caused by disorder effects, was predicted more than 40 years ago. Its signature, the divergence of the dynamical critical exponent, is challenging to observe experimentally. We report the experimental observation of the quantum Griffiths singularity in a two-dimensional superconducting system. We measured the transport properties of atomically thin gallium films and found that the films undergo superconductor-metal transitions with increasing magnetic field. Approaching the zero-temperature quantum critical point, we observed divergence of the dynamical critical exponent, which is consistent with the Griffiths singularity behavior. We interpret the observed superconductor-metal quantum phase transition as the infinite-randomness critical point, where the properties of the system are controlled by rare large superconducting regions.
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