Alternating Superconducting and Charge Density Wave Monolayers within Bulk 6R-TaS2

Amritroop Achari, Jonas Bekaert, Vishnu Sreepal, Andrey Orekhov, Piranavan Kumaravadivel, Minsoo Kim, Nicolas Gauquelin, Premlal Balakrishna Pillai, Johan Verbeeck, Francois M. Peeters, Andre K. Geim, Milorad V. Milosevic, Rahul R. Nair

Research output: Contribution to journalArticlepeer-review


Van der Waals (vdW) heterostructures continue to attract intense interest as a route of designing materials with novel properties that cannot be found in nature. Unfortunately, this approach is currently limited to only a few layers that can be stacked on top of each other. Here, we report a bulk vdW material consisting of superconducting 1H TaS2monolayers interlayered with 1T TaS2monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tcof the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2stems from amalgamation of the properties of adjacent 1H and 1T monolayers, where the former dominates the superconducting state and the latter the CDW behavior.

Original languageEnglish
Pages (from-to)6268-6275
Number of pages8
JournalNano Letters
Issue number15
Publication statusPublished - 10 Aug 2022


  • 2D materials
  • Bulk van der Waals heterostructure
  • Charge density waves
  • Superconductivity
  • TaS


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