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Mixed-dimensional moiré systems of twisted graphitic thin films
Dacen Waters1,2, Ellis Thompson1, Esmeralda Arreguin-Martinez3
1Department of Physics, University of Washington, Seattle, WA, USA.
Nature
|July 19, 2023
Summary
Twisted graphene-graphite creates a novel mixed-dimensional moiré material. This structure
Area of Science:
- Condensed Matter Physics
- Materials Science
- Nanoscience
Background:
- Moiré patterns in van der Waals heterostructures exhibit unique physical properties.
- Previous research focused on few-layer 2D materials, with limited impact on bulk crystals.
Purpose of the Study:
- To investigate the influence of moiré patterns on bulk graphite electronic properties.
- To explore the creation of a new class of mixed-dimensional moiré materials.
Main Methods:
- Fabrication of dual-gated devices with twisted monolayer graphene on bulk graphite.
- Transport measurements under varying gate voltages and magnetic fields.
Main Results:
- Moiré potential significantly alters bulk graphitic thin film electronic properties.
- Gate-tuneable moiré and surface states coexist with non-gatable bulk states.
- High magnetic fields induce hybridization between moiré and bulk graphite states, forming a quasi-2D hybrid structure.
Conclusions:
- Twisted graphene-graphite represents a new class of mixed-dimensional moiré materials.
- Demonstrates that moiré potentials can modify bulk crystal properties.
- Highlights the role of Landau bands in hybridizing moiré and bulk states.
