Tunable Moiré Superlattice of Artificially Twisted Monolayers

Abstract

Twisting between two stacked monolayers modulates periodic potentials and forms the Moiré electronic superlattices, which offers an additional degree of freedom to alter material property. Considerable unique observations, including unconventional superconductivity, coupled spin‐valley states, and quantized interlayer excitons are correlated to the electronic superlattices but further study requires reliable routes to study the Moiré in real space. Scanning tunneling microscopy (STM) is ideal to precisely probe the Moiré superlattice and correlate coupled parameters among local electronic structures, strains, defects, and band alignment at atomic scale. Here, a clean route is developed to construct twisted lattices using synthesized monolayers for fundamental studies. Diverse Moiré superlattices are predicted and successfully observed with STM at room temperature. Electrical tuning of the Moiré superlattice is achieved with stacked TMD on graphite.

Synthesis and characterization of WS2/graphene/SiC van der Waals heterostructures via WO3−x thin film sulfurization

“…related the misalignment of the moiré lattice ( ) with the interlayer twist angle ( ) of two non-identical hexagonal lattices using Eq. ( 1 ) 42 : where is the moiré periodicity and is the lattice constant of the top layer. Based on the values obtained by STM for the WS 2 overlayer on epitaxial graphene we can extract an interlayer twist angle .…”

Correlation-induced valley topology in buckled graphene superlattices

“…Mesoscopic systems provide a highly powerful platform to design quantum matter, [1][2][3][4][5] with the paradigmatic example of artificial topological superconductivity. [6][7][8][9][10][11][12][13][14][15] Moire two-dimensional materials have risen as a tunable platform to engineer states of matter, 5 ultimately allowing to explore a variety of controllable correlated states.…”

Density-functional approach to the band gaps of finite and periodic two-dimensional systems

“…On the other hand, the discoveries of atomic 2D materials, such as graphene, have inspired band-structure engineering in a variety of 2D systems [2][3][4][5][6][7][8][9][10][11]. In addition, the recently discovered properties of twisted bilayer graphene [12][13][14] have led to next phase of so-called designer materials [15][16][17][18][19][20][21].…”