Journal
SCIENCE
Volume 350, Issue 6259, Pages 409-413Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1259440
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Funding
- Japan Society for the Promotion of Science (JSPS)
- European Research Council [648855 Ig-QPD]
- Japan Science and Technology Agency
- JSPS [25000003]
- MEXT of Japan [22103004]
- Grants-in-Aid for Scientific Research [22103004, 25000003, 26105004, 15J07681, 15H05457] Funding Source: KAKEN
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Recently emerging two-dimensional (2D) superconductors in atomically thin layers and at heterogeneous interfaces are attracting growing interest in condensed matter physics. Here, we report that an ion-gated zirconium nitride chloride surface, exhibiting a dome-shaped phase diagram with a maximum critical temperature of 14.8 kelvin, behaves as a superconductor persisting to the 2D limit. The superconducting thickness estimated from the upper critical fields is congruent to 1.8 nanometers, which is thinner than one unit-cell. The majority of the vortex phase diagram down to 2 kelvin is occupied by a metallic state with a finite resistance, owing to the quantum creep of vortices caused by extremely weak pinning and disorder. Our findings highlight the potential of electric-field-induced superconductivity, establishing a new platform for accessing quantum phases in clean 2D superconductors.
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