Charge Density Waves in Electron-Doped Molybdenum Disulfide.

Mohammed K Bin Subhan, Asif Suleman, Gareth Moore, Peter Phu, Moritz Hoesch, Hidekazu Kurebayashi, Christopher A Howard, Steven R Schofield

Nano letters 2021 Jul 14

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We present the discovery of a charge density wave (CDW) ground state in heavily electron-doped molybdenum disulfide (MoS2). This is the first observation of a CDW in any d2 (column 6) transition metal dichalcogenide (TMD). The band structure of MoS2 is distinct from the d0 and d1 TMDs in which CDWs have been previously observed, facilitating new insight into CDW formation. We demonstrate a metal-insulator transition at 85 K, a 25 meV gap at the Fermi level, and two distinct CDW modulations, (2√3 × 2√3) R30° and 2 × 2, attributable to Fermi surface nesting (FSN) and electron-phonon coupling (EPC), respectively. This simultaneous exhibition of FSN and EPC CDW modulations is unique among observations of CDW ground states, and we discuss this in the context of band folding. Our observations provide a route toward the resolution of controversies surrounding the origin of CDW modulations in TMDs.

Citation

Mohammed K Bin Subhan, Asif Suleman, Gareth Moore, Peter Phu, Moritz Hoesch, Hidekazu Kurebayashi, Christopher A Howard, Steven R Schofield. Charge Density Waves in Electron-Doped Molybdenum Disulfide. Nano letters. 2021 Jul 14;21(13):5516-5521