期刊
PHYSICAL REVIEW B
卷 100, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.100.064506
关键词
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资金
- Italia-India collaborative project SuperTop (Italian MAECI) [PGR04879]
- Italia-India collaborative project SuperTop (Indian Department of Science and Technology) [INT/Italy/P-21/2016 (SP)]
- Sapienza University via Ateneo 2017 [RM11715C642E8370]
- Sapienza University via Ateneo 2018 [RM11816431DBA5AF]
- Department of Science and Technology, Government of India [EMR/2015/000083]
- IFCPAR French-Indian program [4704-A]
- Delegation Generale a l'Armement
- Nano-SO2DEG project of the JCJC program of the ANR
- Department of Atomic Energy, Government of India
One of the hallmarks of the Berezinskii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors is the universal jump of the superfluid density that can be indirectly probed via the nonlinear exponent of the current-voltage I-V characteristics. Here, we compare the experimental measurements of I-V characteristics in two cases, namely NbN thin films and SrTiO3-based interfaces. While the former display a paradigmatic example of BKT-like nonlinear effects, the latter do not seem to justify a BKT analysis. Rather, the observed I-V characteristics can be well reproduced theoretically by modeling the effect of mesoscopic inhomogeneity of the superconducting state. Our results offer an alternative perspective on the spontaneous fragmentation of the superconducting background in confined two-dimensional systems.
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