Combined minivalley and layer control in twisted double bilayer graphene
arXiv:2002.05267 · doi:10.1103/PhysRevLett.125.176801
Abstract
Control over minivalley polarization and interlayer coupling is demonstrated in double bilayer graphene twisted with an angle of 2.37. This intermediate angle is small enough for the minibands to form and large enough such that the charge carrier gases in the layers can be tuned independently. Using a dual-gated geometry we identify and control all possible combinations of minivalley polarization via the population of the two bilayers. An applied displacement field opens a band gap in either of the two bilayers, allowing us to even obtain full minivalley polarization. In addition, the wavefunctions of the minivalleys are mixed by tuning through a Lifshitz transition, where the Fermi surface topology changes. The high degree of control makes twisted double bilayer graphene a promising platform for valleytronics devices such as valley valves, filters and logic gates.
arXiv commentSupplemental Material included in PDF
References in corpus (22)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Moire bands in twisted double-layer graphene
- Valley filter and valley valve in graphene
- Gate-induced insulating state in bilayer graphene devices
- Observation of Van Hove singularities in twisted graphene layers
- Flat Bands in Slightly Twisted Bilayer Graphene
- Detecting Topological Currents in Graphene Superlattices
- Spin-polarized Correlated Insulator and Superconductor in Twisted Double Bilayer Graphene
- Correlated states in twisted double bilayer graphene
- Superlattice-induced insulating states and valley-protected orbits in twisted bilayer graphene
- Correlated Insulating States in Twisted Double Bilayer Graphene
- Quantum valley Hall effect, orbital magnetism, and anomalous Hall effect in twisted multilayer graphene systems
- Theory of correlated insulating behaviour and spin-triplet superconductivity in twisted double bilayer graphene
- A valley valve and electron beam splitter
- Helical networks in twisted bilayer graphene under interlayer bias
- Transport through a network of topological states in twisted bilayer graphene
- Valleytronics in merging Dirac cones: All-electric-controlled valley filter, valve and universal reversible logic gate
- Charge inversion and topological phase transition at a twist angle induced van Hove singularity of bilayer graphene
- The Electronic Thickness of Graphene
- Gap Opening in Twisted Double Bilayer Graphene by Crystal fields
- Minibands in twisted bilayer graphene probed by magnetic focusing
Cited by in corpus (14)
- Correlated electron-hole State in Twisted Double Bilayer Graphene
- Evidence of orbital ferromagnetism in twisted bilayer graphene aligned to hexagonal boron nitride
- Two-dimensional Kagome Materials: Theoretical Insights, Experimental Realizations, and Electronic Structures
- Electric-field-tunable electronic nematic order in twisted double-bilayer graphene
- Raman imaging of twist angle variations in twisted bilayer graphene at intermediate angles
- Strong interminivalley scattering in twisted bilayer graphene revealed by high-temperature magnetooscillations
- Full Slonczewski-Weiss-McClure parametrization of few-layer twistronic graphene
- Scattering between minivalleys in a moiré material
- Trigonal Warping, Satellite Dirac Points and Multiple Field Tuned Topological Transitions in Twisted Double Bilayer Graphene
- Probing miniband structure and Hofstadter butterfly in gated graphene superlattices via magnetotransport
- Interlayer electron-hole friction in tunable twisted bilayer graphene semimetal
- Interplay of Landau quantization and interminivalley scatterings in a weakly coupled moiré superlattice
- Electric Field-Induced Hole- and Electron-Type Flat Bands in Twisted Double Bilayer Graphene
- Decomposing Electronic Structures in Twisted Multilayers: Bridging Spectra and Incommensurate Wave Functions