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.
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- Full Slonczewski-Weiss-McClure parametrization of few-layer twistronic graphene
- 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
- Decomposing Electronic Structures in Twisted Multilayers: Bridging Spectra and Incommensurate Wave Functions