Fig. 4: Interaction enhanced gap in neutral BLG coupled to interfacial charge order in CrOCl.
From: Unconventional correlated insulator in CrOCl-interfaced Bernal bilayer graphene
a Schematics of the band diagram of the system. The relative energy difference between the bottom energy of the interface states and the charge neutrality point (CNP) energy of BLG can be tuned by the gate voltages. Δ denotes the single particle gap. b Schematic picture of the BLG/CrOCl hetero-system with the long wavelength charge order (red circles labeled with e−) in the surface of CrOCl. A thin h-BN may be intercalated for examining the gap as a function of distance d between BLG and the interfacial states. c Band structures of BLG obtained from the renormalization group Hartree-Fock calculations (solid lines) and that in the non-interacting case (dashed lines). d The calculated interaction gap ΔHF as a function of the interfacial charge density nCrOCl in CrOCl. e–i Dual-gate maps of longitudinal channel resistance Rxx at different intercalation distance d of 0, 0.34, 0.68, 4.99, and 6.16 nm, respectively. (j) The calculated interaction strength η as a function of d for BLG/CrOCl (green solid circle and line) and bare BLG (green dashed line), respectively.
