English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Realization of high-quality van der Waals (vdW) heterostructures withtailored properties by stacking two-dimensional (2D) layers requires atomicallyclean interfaces. Because of strong adhesion between the constituent layers,the vdW forces could drive trapped contaminants together into submicron-sizebubbles, which leaves large interfacial areas atomically clean. Such aphenomenon is dubbed self-cleaning mechanism in 2D systems. Here, wedemonstrate the breakdown of self-cleaning mechanism for nanoscale interfacialbubbles in tiny-angle twisted bilayer graphene (TBG). In the tiny-angle TBG,there is a triangular network of domain boundaries due to structuralreconstruction. Our experiments indicate that the bubbles will mainly movealong the triangular network of domain boundaries when the sizes of the bubblesare comparable to that of an AA-stacking region in the TBG. When the size ofthe bubble is smaller than that of an AA-stacking region, the bubble becomesmotionless and is fixed in the AA-stacking region because of its largeout-of-plane corrugation. Our results reveal a substantial influence of themoir\'e superlattice on the motion of nanoscale interfacial substances.

Breakdown of self-cleaning mechanism for nanoscale interfacial substances in tiny-angle twisted bilayer graphene