Gated tuned superconductivity and phonon softening in monolayer and bilayer MoS2

Yajun Fu, Erfu Liu, Hongtao Yuan, Peizhe Tang, Biao Lian, Gang Xu, Junwen Zeng, Zhuoyu Chen, Yaojia Wang, Wei Zhou, Kang Xu, Anyuan Gao, Chen Pan, Miao Wang, Baigeng Wang, Shou Cheng Zhang, Yi Cui, Harold Y. Hwang, Feng Miao

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Superconductors at the atomic two-dimensional limit are the focus of an enduring fascination in the condensed matter community. This is because, with reduced dimensions, the effects of disorders, fluctuations, and correlations in superconductors become particularly prominent at the atomic two-dimensional limit; thus such superconductors provide opportunities to tackle tough theoretical and experimental challenges. Here, based on the observation of ultrathin two-dimensional superconductivity in monolayer and bilayer molybdenum disulfide (MoS2) with electric-double-layer gating, we found that the critical sheet carrier density required to achieve superconductivity in a monolayer MoS2 flake can be as low as 0.55 × 1014 cm-2, which is much lower than those values in the bilayer and thicker cases in previous report and also our own observations. Further comparison of the phonon dispersion obtained by ab initio calculations indicated that the phonon softening of the acoustic modes around the M point plays a key role in the gate-induced superconductivity within the Bardeen-Cooper-Schrieffer theory framework. This result might help enrich the understanding of two-dimensional superconductivity with electric-double-layer gating.

Original languageEnglish (US)
Article number52
Journalnpj Quantum Materials
Volume2
Issue number1
DOIs
StatePublished - Dec 1 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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