Band Gap Opening in Bilayer Graphene-CrCl<sub>3</sub>/CrBr<sub>3</sub>/CrI<sub>3</sub> van der Waals Interfaces.
basic_science · Level V
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- Record sourced from PubMed, PMID 35930625.
- Also identified by DOI 10.1021/acs.nanolett.2c02369.
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Abstract
We report experimental investigations of transport through bilayer graphene (BLG)/chromium trihalide (CrX<sub>3</sub>; X = Cl, Br, I) van der Waals interfaces. In all cases, a large charge transfer from BLG to CrX<sub>3</sub> takes place (reaching densities in excess of 10<sup>13</sup> cm<sup>-2</sup>), and generates an electric field perpendicular to the interface that opens a band gap in BLG. We determine the gap from the activation energy of the conductivity and find excellent agreement with the latest theory accounting for the contribution of the σ bands to the BLG dielectric susceptibility. We further show that for BLG/CrCl<sub>3</sub> and BLG/CrBr<sub>3</sub> the band gap can be extracted from the gate voltage dependence of the low-temperature conductivity, and use this finding to refine the gap dependence on the magnetic field. Our results allow a quantitative comparison of the electronic properties of BLG with theoretical predictions and indicate that electrons occupying the CrX<sub>3</sub> conduction band are correlated.