Nano Letters· 2026Q1
Bandwidth-Limited Critical Currents in Electrically Tunable Moire Bands
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- 2026year
Short summary
Critical current in bilayer graphene superlattices is directly limited by the miniband bandwidth, decreasing as the band flattens with an out-of-plane electric field.
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Key points
- Critical current in moire superlattices is directly set by the miniband bandwidth.
- Flattening the valence miniband in bilayer graphene with an electric field reduces the critical current.
- A minimal analytical model accurately captures the observed critical current reduction.
- The scaling between critical current and bandwidth is a universal feature in graphene superlattices.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract Moiré superlattices host narrow minibands whose bandwidth governs correlated and topological phases. Here, we demonstrate that the bandwidth also sets the critical current for the onset of out-of-equilibrium transport. In bilayer graphene aligned to hexagonal boron nitride, we explore the high-current transport regime as we continuously flatten the valence miniband using an out-of-plane displacement field. We observe a significant reduction in the critical current, which is captured by a minimal analytical model and corresponds to the calculated narrowing of the miniband. Moreover, by comparing distinct moiré platforms, we show that the scaling between critical current and bandwidth is a universal feature of graphene superlattices. Our results reveal a direct link between miniband dispersion and high-current transport, and establish this regime as a fast and accessible electrical probe of bandwidth evolution.
The authors' abstract, as published at the source. Nano Letters, 2026 · DOI ↗
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Field: Materials Chemistry
Materials ChemistryMaterials Science