3 years ago

Enhanced Superconductivity and Suppression of Charge-density Wave Order in 2H-TaS$_2$ in the Two-dimensional Limit.

Efthimios Kaxiras, Jonathan Ruhman, Valla Fatemi, Takashi Taniguchi, Pablo Jarillo-Herrero, Kenji Watanabe, Yafang Yang, Shiang Fang, Efrén Navarro-Moratalla

As superconductors are thinned down to the 2D limit, their critical temperature $T_c$ typically decreases. Here we report the opposite behavior, an enhancement of $T_c$ with decreasing thickness, in the 2D crystalline superconductor 2H-TaS$_2$. Remarkably, in the monolayer limit, $T_c$ increases by over a factor of four compared to bulk crystals. Accompanying this trend in superconductivity, we observe progressive weakening and suppression of the charge-density wave (CDW) transition with decreasing thickness. To explain these trends, we perform electronic structure calculations showing that a reduction of the CDW amplitude results in a substantial increase of the density of states at the Fermi energy, which contributes to the enhancement of $T_c$. Our results establish ultra-thin 2H-TaS$_2$ as an ideal platform to study the competition between CDW order and superconductivity.

Publisher URL: http://arxiv.org/abs/1711.00079

DOI: arXiv:1711.00079v1

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