Band Gap Opening in Bilayer Graphene-CrCl3/CrBr3/CrI3 van der Waals InterfacesClick to copy article linkArticle link copied!
- Giulia Tenasini*Giulia Tenasini*Email: [email protected]Department of Quantum Matter Physics and Group of Applied Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Giulia Tenasini
- David Soler-DelgadoDavid Soler-DelgadoDepartment of Quantum Matter Physics and Group of Applied Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by David Soler-Delgado
- Zhe WangZhe WangDepartment of Quantum Matter Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMOE Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Shaanxi Province Key Laboratory of Advanced Materials and Mesoscopic Physics, School of Physics, Xi’an Jiaotong University, Xi’an 710049, ChinaMore by Zhe Wang
- Fengrui YaoFengrui YaoDepartment of Quantum Matter Physics and Group of Applied Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Fengrui Yao
- Dumitru DumcencoDumitru DumcencoDepartment of Quantum Matter Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Dumitru Dumcenco
- Enrico GianniniEnrico GianniniDepartment of Quantum Matter Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Enrico Giannini
- Kenji WatanabeKenji WatanabeResearch Center for Functional Materials, NIMS, 1-1 Namiki, Tsukuba 305-0044, JapanMore by Kenji Watanabe
- Takashi TaniguchiTakashi TaniguchiInternational Center for Materials Nanoarchitectonics, NIMS, 1-1 Namiki, Tsukuba 305-0044, JapanMore by Takashi Taniguchi
- Christian MoulsdaleChristian MoulsdaleNational Graphene Institute and School of Physics & Astronomy, University of Manchester, Manchester M13 9PL, U.K.More by Christian Moulsdale
- Aitor Garcia-RuizAitor Garcia-RuizNational Graphene Institute and School of Physics & Astronomy, University of Manchester, Manchester M13 9PL, U.K.More by Aitor Garcia-Ruiz
- Vladimir I. Fal’koVladimir I. Fal’koNational Graphene Institute and School of Physics & Astronomy, University of Manchester, Manchester M13 9PL, U.K.Henry Royce Institute for Advanced Materials, Manchester M13 9PL, U.K.More by Vladimir I. Fal’ko
- Ignacio Gutiérrez-LezamaIgnacio Gutiérrez-LezamaDepartment of Quantum Matter Physics and Group of Applied Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Ignacio Gutiérrez-Lezama
- Alberto F. Morpurgo*Alberto F. Morpurgo*Email: [email protected]Department of Quantum Matter Physics and Group of Applied Physics, University of Geneva, 24 Quai Ernest Ansermet, CH-1211 Geneva, SwitzerlandMore by Alberto F. Morpurgo
Abstract

We report experimental investigations of transport through bilayer graphene (BLG)/chromium trihalide (CrX3; X = Cl, Br, I) van der Waals interfaces. In all cases, a large charge transfer from BLG to CrX3 takes place (reaching densities in excess of 1013 cm–2), 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/CrCl3 and BLG/CrBr3 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 CrX3 conduction band are correlated.
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