Gate-defined wires in twisted bilayer graphene: from electrical detection of inter-valley coherence to internally engineered Majorana modes
arXiv:2105.02891 · doi:10.1103/PhysRevB.105.L081405
Abstract
Twisted bilayer graphene (TBG) realizes a highly tunable, strongly interacting system featuring superconductivity and various correlated insulating states. We establish gate-defined wires in TBG with proximity-induced spin-orbit coupling as a tool for revealing the nature of correlated insulators and a platform for Majorana-based topological qubits. In particular, we show that the band structure of a gate-defined wire immersed in an `inter-valley coherent' correlated insulator inherits electrically detectable fingerprints of symmetry breaking native to the latter. Surrounding the wire by a superconducting TBG region on one side and an inter-valley coherent correlated insulator on the other further enables the formation of Majorana zero modes--possibly even at zero magnetic field depending on the precise symmetry-breaking order present. Our proposal not only introduces a highly gate-tunable topological qubit medium relying on internally generated proximity effects, but can also shed light on the Cooper-pairing mechanism in TBG.
arXiv comment7 pages, 39 pages appendix (v2: new references and additional discussion in appendix)
References in corpus (70)
- The electronic properties of graphene
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Fault-tolerant quantum computation by anyons
- Non-Abelian Anyons and Topological Quantum Computation
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Unpaired Majorana fermions in quantum wires
- Majorana Fermions and a Topological Phase Transition in Semiconductor-Superconductor Heterostructures
- Helical liquids and Majorana bound states in quantum wires
- Moire bands in twisted double-layer graphene
- Tuning superconductivity in twisted bilayer graphene
- Emergent ferromagnetism near three-quarters filling in twisted bilayer graphene
- Superconductors, Orbital Magnets, and Correlated States in Magic Angle Bilayer Graphene
- Graphene bilayer with a twist: electronic structure
- Intrinsic quantized anomalous Hall effect in a moiré heterostructure
- Superconducting 2D system with lifted spin degeneracy: Mixed singlet-triplet state
- Magic Angle Spectroscopy
- Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
- Graphene Bilayers with a Twist
- Imaging Electronic Correlations in Twisted Bilayer Graphene near the Magic Angle
- Charge-Order and Broken Rotational Symmetry in Magic Angle Twisted Bilayer Graphene
- Lattice relaxation and energy band modulation in twisted bilayer graphenes
- Spin-Orbit Proximity Effect in Graphene
- Origin of Mott insulating behavior and superconductivity in twisted bilayer graphene
- Untying the insulating and superconducting orders in magic-angle graphene
- Electric field tunable unconventional superconductivity in alternating twist magic-angle trilayer graphene
- Cascade of electronic transitions in magic-angle twisted bilayer graphene
- Strong interface-induced spin-orbit coupling in graphene on WS2
- Cascade of Phase Transitions and Dirac Revivals in Magic Angle Graphene
- Decoupling superconductivity and correlated insulators in twisted bilayer graphene
- Faithful Tight-binding Models and Fragile Topology of Magic-angle Bilayer Graphene
- Phonon scattering dominated electron transport in twisted bilayer graphene
- Fragile Topology and Wannier Obstructions
- Nematicity and Competing Orders in Superconducting Magic-Angle Graphene
- Graphene on transition-metal dichalcogenides: a platform for proximity spin-orbit physics and optospintronics
- Superconductivity without insulating states in twisted bilayer graphene stabilized by monolayer WSe
- Band Structure of Twisted Bilayer Graphene: Emergent Symmetries, Commensurate Approximants and Wannier Obstructions
- Trivial and inverted Dirac bands, and emergence of quantum spin Hall states in graphene on transition-metal dichalcogenides
- Ground State and Hidden Symmetry of Magic Angle Graphene at Even Integer Filling
- An exact continuum model for low-energy electronic states of twisted bilayer graphene
- Interaction Effects in Topological Superconducting Wires Supporting Majorana Fermions
- Magic Angle Hierarchy in Twisted Graphene Multilayers
- Designing Flat Band by Strain
- Strongly anisotropic spin relaxation in graphene/transition metal dichalcogenide heterostructures at room temperature
- Tuning electron correlation in magic-angle twisted bilayer graphene using Coulomb screening
- Twisted Bilayer Graphene IV. Exact Insulator Ground States and Phase Diagram
- Spin-orbit driven band inversion in bilayer graphene by van der Waals proximity effect
- Observation of a One-Dimensional Spin-Orbit Gap in a Quantum Wire
- Large Proximity-Induced Spin Lifetime Anisotropy in Transition Metal Dichalcogenide/Graphene Heterostructures
- Charged Skyrmions and Topological Origin of Superconductivity in Magic Angle Graphene
- Origin and magnitude of 'designer' spin-orbit interaction in graphene on semiconducting transition metal dichalcogenides
- Tunable spin-orbit coupling and symmetry-protected edge states in graphene/WS
- Correlated insulating phases of twisted bilayer graphene at commensurate filling fractions: a Hartree-Fock study
- Competing zero-field Chern insulators in Superconducting Twisted Bilayer Graphene
- Large spin relaxation anisotropy and valley-Zeeman spin-orbit coupling in WSe2/Gr/hBN heterostructures
- Spin-orbit driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene
- Strong electron-hole symmetric Rashba spin-orbit coupling in graphene/monolayer transition metal dichalcogenide heterostructures
- Twist-angle dependence of the proximity spin-orbit coupling in graphene on transition-metal dichalcogenides
- Strong Spin-Orbit Interaction Induced in Graphene by Monolayer WS
- Gate-Defined Josephson Junctions in Magic-Angle Twisted Bilayer Graphene
- Conductance through a helical state in an InSb nanowire
- Correlation-induced insulating topological phases at charge neutrality in twisted bilayer graphene
- Highly Tunable Junctions and Nonlocal Josephson Effect in Magic Angle Graphene Tunneling Devices
- Symmetry breaking and skyrmionic transport in twisted bilayer graphene
- Magnetotransport in heterostructures of transition metal dichalcogenides and graphene
- Quantum Hall Effect Measurement of Spin-Orbit Coupling Strengths in Ultraclean Bilayer Graphene/WSe2 Heterostructures
- Spin-Orbit Interaction Induced in Graphene by Transition-Metal Dichalcogenides
- Electric-field-tunable valley Zeeman effect in bilayer graphene heterostructures: Realization of the spin-orbit valve effect
- Strange metal behavior of the Hall angle in twisted bilayer graphene
- Large Pauli Limit Violation and Reentrant Superconductivity in Magic-Angle Twisted Trilayer Graphene
- The gate-tunable strong and fragile topology of multilayer-graphene on a transition metal dichalcogenide
Cited by in corpus (11)
- Detecting symmetry breaking in magic angle graphene using scanning tunneling microscopy
- Gate-Defined Topological Josephson Junctions in Bernal Bilayer Graphene
- Trions in Twisted Bilayer Graphene
- Gate-defined electron interferometer in bilayer graphene
- Majorana bound states in encapsulated bilayer graphene
- Symmetry-broken metallic orders in spin-orbit-coupled Bernal bilayer graphene
- Majorana zero modes in twisted transition metal dichalcogenides homobilayers
- Interface engineering of van der Waals heterostructures towards energy-efficient quantum devices operating at high temperatures
- Gate-defined single-electron transistors in twisted bilayer graphene
- An effective curved space-time geometric theory of generic twist angle graphene with application to a rotating bilayer configuration
- Surface acoustic wave-driven valley current generation in intervalley coherent states