期刊
PHYSICAL REVIEW B
卷 98, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.035203
关键词
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资金
- U.S. DOE, BES Office, Division of Materials Sciences and Engineering [DE-SC0001819]
- Gordon and Betty Moore Foundations EPiQS Initiative [GBMF4541]
- NSF-STC Center for Integrated Quantum Materials [DMR-1231319]
- ARO MURI [W911NF-14-0247]
- National Science Foundation [DMR-14-19807]
- NSF ECCS [1541959]
- NSF [ACI-1053575, DMR-1157490]
- Gordon and Betty Moore Foundation under the EPiQS initiative [GBMF4303]
- State of Florida
- MEXT, Japan
- JSPS KAKENHI [JP15K21722, JP25106006]
- U.S. Department of Energy (DOE) [DE-SC0001819] Funding Source: U.S. Department of Energy (DOE)
Layered transition-metal dichalcogenides that host coexisting charge-density wave (CDW) and superconducting orders provide ideal systems for exploring the effects of dimensionality on correlated electronic phases. Dimensionality has a profound effect on both superconductivity and CDW instabilities. Here we report a substantial enhancement of the superconducting T-c to 3.4 K for 2H-TaS2 in the monolayer limit, compared to 0.8 K in the bulk. In addition, the transport signature of a CDW phase transition vanishes in the two-dimensional limit. In our analysis of electronic and vibrational properties of this material, we show that a reduction of the CDW amplitude results in a substantial increase of the density of states at the Fermi energy, which can boost T, by an amount similar to that seen in experiment. Our results indicate competition between CDW order and superconductivity in ultrathin 2H-TaS2 down to the monolayer limit, providing insight toward understanding correlated electronic phases in reduced dimensions.
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