Electron Collimation in Twisted Bilayer Graphene via Gate-Defined Moiré Barriers.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39316821.
- Also identified by DOI 10.1021/acs.nanolett.4c03373 and PMC identifier 11469298.
- Licence recorded as CC BY-NC-ND.
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Abstract
Electron collimation via a graphene p-n junction allows electrostatic control of ballistic electron trajectories akin to that of an optical circuit. Similar manipulation of novel correlated electronic phases in twisted-bilayer graphene (tBLG) can provide additional probes to the underlying physics and device components toward advanced quantum electronics. In this work, we demonstrate collimation of the electron flow via gate-defined moiré barriers in a tBLG device, utilizing the band-insulator gap of the moiré superlattice. A single junction can be tuned to host a chosen combination of conventional pseudo barrier and moiré tunnel barriers, from which we demonstrate improved collimation efficiency. By measuring transport through two consecutive moiré collimators separated by 1 μm, we demonstrate evidence of electron collimation in tBLG in the presence of realistic twist-angle inhomogeneity.