Electric field effect on superconductivity in atomically thin flakes of NbSe2

Neal E. Staley, Jian Wu, Peter Eklund, Ying Liu, Linjun Li, Zhuan Xu

Research output: Contribution to journalArticle

109 Scopus citations

Abstract

We studied the electric field effect on superconductivity in atomically thin flakes of NbSe2 prepared by mechanical exfoliation. We found that these NbSe2 flakes are superconducting down to a thickness of a single unit cell consisting of two molecular layers of NbSe2 with an onset superconducting transition temperature (Tc) up to 2.5 K. We demonstrated that the Tc of the thinnest flakes can be modulated by an applied gate voltage with a Tc shift as large as 200 mK, which is larger than expected from a simple consideration based on Bardeen-Cooper-Schrieffer theory. We discuss the possible reasons for the observed enhanced electric field modulation of Tc.

Original languageEnglish (US)
Article number184505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number18
DOIs
StatePublished - Nov 12 2009

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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