Charge density waves in electron-doped molybdenum disulfide

Abstract

We present the discovery of a charge density wave (CDW) ground state in heavily electron-doped molybdenum disulfide (MoS${}_2$). This is the first observation of a CDW in any $d^2$ (column 6) transition metal dichalcogenide (TMD). The band structure of MoS${}_2$ is distinct from the $d^0$ and $d^1$ 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, $(2\sqrt{3}\times 2\sqrt{3})$R$30^{\circ }$ and $2\times 2$, 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.

arXiv comment19 pages, 4 figures, supplementary information

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Cited by in corpus (6)

• Percolating Superconductivity in Air-Stable Organic-Ion Intercalated MoS2
• Phonon Self-Energy Corrections: To Screen, or Not to Screen
• Controlling charge density order in 2H-TaSe${}_2$ using a van Hove singularity
• Nonlocal optical conductivity of Fermi surface nesting materials
• Anomalous metallic phase in molybdenum disulphide induced via gate-driven organic ion intercalation
• Doping Tunable CDW Phase Transition in Bulk 1T-ZrSe${}_2$