Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit
Name
PhysRevB.98.035203.pdf
Size
2.82 MB
Format
Adobe PDF
Checksum (MD5)
9819727033db0ca76326d6901a347238
Author(s)
Fang, Shiang
Navarro-Moratalla, Efrén
Watanabe, Kenji
Taniguchi, Takashi
Kaxiras, Efthimios
Yang, Yafang
Fatemi, Valla
Ruhman, Yehonatan
Jarillo-Herrero, Pablo
Date Issued
July 2018
Journal
Physical Review B
Publisher
American Physical Society
Citation
Yang, Yafang et al. "Enhanced superconductivity upon weakening of charge density wave transport in 2H-TaS₂ in the two-dimensional limit." Physical Review B 98, 3 (July 2018): 035203 © 2018 American Physical Society
Version
Final published version
Abstract
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[subscript 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[subscript c] 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.98.035203
