Misfit layer compounds: a platform for heavily-doped two-dimensional transition metal dichalcogenides

Abstract

Transition metal dichalcogenides (TMDs) display a rich variety of instabilities such as spin and charge orders, Ising superconductivity and topological properties. Their physical properties can be controlled by doping in electric double-layer field-effect transistors (FET). However, for the case of single layer NbSe${}_2$, FET doping is limited to $\approx 1\times 10^{14}$ cm${}^{-2}$, while a somewhat larger charge injection can be obtained via deposition of K atoms. Here, by performing ARPES, STM, quasiparticle interference measurements, and first principles calculations we show that a misfit compound formed by sandwiching NbSe${}_2$ and LaSe layers behaves as a NbSe${}_2$ single layer with a rigid doping of $0.55-0.6$ electrons per Nb atom or $\approx 6\times 10^{14}$ cm${}^{-2}$. Due to this huge doping, the $3\times 3$ charge density wave is replaced by a $2\times 2$ order with very short coherence length. As a tremendous number of different misfit compounds can be obtained by sandwiching TMDs layers with rock salt or other layers, our work paves the way to the exploration of heavily doped 2D TMDs over an unprecedented wide range of doping.

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Cited by in corpus (10)

• Misfit Layered Compounds: Unique, Tunable Heterostructured Materials with Untapped Properties
• Misfit layer compounds as ultra-tunable field effect transistors: from charge transfer control to emergent superconductivity
• Protection of Ising spin-orbit coupling in bulk misfit superconductors
• Revealing the two-dimensional electronic structure and anisotropic superconductivity in a natural van der Waals superlattice (PbSe)${}_{1.14}$NbSe${}_2$
• Ising superconductivity: a first-principles perspective
• One-dimensional electronic states in a natural misfit structure
• Ising superconductivity in noncentrosymmetric bulk NbSe2
• Quasi-two-dimensional heterostructures (K$M_{1-x}$Te)(LaTe${}_3$) ($M$ = Mn, Zn) with charge density waves
• Growth and Characterization of Superconducting Bulk Crystal [(SnSe)${}_{1+\delta }$]${}_m$(NbSe${}_2$) Misfit Layer Compounds
• Extreme in-plane upper critical magnetic fields of heavily doped quasi-two-dimensional transition metal dichalcogenides