Charge Density Waves in Electron-Doped Molybdenum Disulfide.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 34228455.
- Also identified by DOI 10.1021/acs.nanolett.1c00677 and PMC identifier 8397392.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
We present the discovery of a charge density wave (CDW) ground state in heavily electron-doped molybdenum disulfide (MoS<sub>2</sub>). This is the first observation of a CDW in any <i>d</i><sup>2</sup> (column 6) transition metal dichalcogenide (TMD). The band structure of MoS<sub>2</sub> is distinct from the <i>d</i><sup>0</sup> and <i>d</i><sup>1</sup> 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.
Medical subject headings
- Electrons
- Molybdenum