Configurational Electronic States in Layered Metallic Dichalcogenides

Abstract

Mesoscopic irregularly ordered and even amorphous self-assembled electronic structures were recently reported in two-dimensional metallic dichalcogenides (TMDs), created and manipulated with short light pulses or by charge injection. Apart from promising new all-electronic memory devices, such states are of great fundamental importance, since such aperiodic states cannot be described in terms of conventional charge-density-wave (CDW) physics. In this paper we address the problem of metastable mesoscopic configurational charge ordering in TMDs with a sparsely filled charged lattice gas model in which electrons are subject only to screened Coulomb repulsion. The model correctly predicts commensurate CDW states corresponding to different TMDs at magic filling fractions $f_m=1/3,1/4,1/9,1/13,1/16$. Doping away from $f_m$ results either in multiple near-degenerate configurational states, or an amorphous state at the correct density observed by scanning tunnelling microscopy. Quantum fluctuations between degenerate states predict a quantum charge liquid at low temperatures, revealing a new generalized viewpoint on both regular, irregular and amorphous charge ordering in transition metal dichalcogenides.

arXiv comment32 pages, 5 figures

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• A time-domain phase diagram of metastable states in a charge ordered quantum material
• Quantum billiards with correlated electrons confined in triangular transition metal dichalcogenide monolayer nanostructures created by laser quench
• Ultra-Efficient Resistance Switching between Charge Ordered Phases in 1T-TaS${}_2$ with a Single Picosecond Electrical Pulse
• Imaging of electrically controlled van der Waals layer stacking in 1T-TaS2
• Scanning tunneling microscopy study of hidden phases in atomically thin 1T-TaS${}_2$