Patterned bilayer graphene as a tunable, strongly correlated system

Abstract

Recent observations of superconductivity in Moire graphene have lead to an intense interest in that system, with subsequent studies revealing a more complex phase diagram including correlated insulators and ferromagnetic phases. Here we propose an alternate system, electrostatically patterned bilayer graphene (PBG), in which a supermodulation is induced via metallic gates rather than the moire effect. We show that, by varying either the gap or the modulation strength, bilayer graphene can be tuned into the strongly correlated regime. Further calculations show that this is not possible in monolayer graphene. We present a general technique for addressing Coulomb screening of the periodic potential and demonstrate that this system is experimentally feasible.

13 pages, 11 figures

References in corpus (16)

• Boron nitride substrates for high-quality graphene electronics
• The electronic properties of bilayer graphene
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• The Coulomb impurity problem in graphene
• Screening, Kohn anomaly, Friedel oscillation, and RKKY interaction in bilayer graphene
• Electronic properties of graphene antidot lattices
• Screening of Coulomb Impurities in Graphene
• Double-dome superconductivity under pressure in the V-based Kagome metals AV3Sb5 (A = Rb and K)
• Brown-Zak and Weiss oscillations in a gate-tunable graphene superlattice: A unified picture of miniband conductivity
• Lateral 2D superlattices in GaAs heterostructures with independent control of carrier density and modulation potential
• Formation of artificial Fermi surfaces with a triangular superlattice on a conventional two dimensional electron gas
• Dynamical screening and excitonic bound states in biased bilayer graphene
• Correlated physics in an artificial triangular anti-dot lattice

Cited by in corpus (8)

• Engineering high quality graphene superlattices via ion milled ultra-thin etching masks
• Gate-tunable topological phases in superlattice modulated bilayer graphene
• Signature of Correlated Insulator in Electric Field Controlled Superlattice
• Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport
• Designing Band Structures by Patterned Dielectric Superlattices
• Quantum-geometric dipole: a topological boost to flavor ferromagnetism in flat bands
• Giant Shift Current in Electrically-Tunable Superlattice Bilayer Graphene
• Designing Flat Bands and Pseudo-Landau Levels in GaAs with Patterned Gates