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. Milošević, 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 TaS2 monolayers interlayered with 1T TaS2 monolayers displaying charge density waves (CDW). This bulk vdW heterostructure is created by phase transition of 1T-TaS2 to 6R at 800 °C in an inert atmosphere. Its superconducting transition (Tc) is found at 2.6 K, exceeding the Tc of the bulk 2H phase. Using first-principles calculations, we argue that the coexistence of superconductivity and CDW within 6R-TaS2 stems 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
JournalNano Letters
Early online date20 Jul 2022
Publication statusPublished - 20 Jul 2022

Research Beacons, Institutes and Platforms

  • National Graphene Institute


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