Enhanced Phonon-Assisted Tunneling in Metal -- Twisted Bilayer Graphene Junctions
arXiv:2507.12991 · doi:10.1021/acsnano.5c06662
Abstract
We report planar tunneling spectroscopy measurements on metal-WSe-twisted bilayer graphene heterostructures across a broad range of gate and bias voltages. The observed experimental features are attributed to phonon-assisted tunneling and the significantly high density of states within the moiré bands. A notable finding is the enhanced phonon-assisted tunneling in twisted bilayer graphene compared to Bernal bilayer graphene, which arises from a more relaxed in-plane momentum matching criterion. Theoretical calculations of phonon dispersions enable us to identify low-energy phonon modes in both Bernal and twisted bilayers of graphene, thereby elucidating the underlying mechanism of tunneling. Our results establish planar tunneling as a versatile tool to further understand electron-phonon coupling in twisted van der Waals materials.
arXiv comment25+12 pages, 4+5 figures
References in corpus (50)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
- Field-effect tunneling transistor based on vertical graphene heterostructures
- 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
- Implementation strategies in phonopy and phono3py
- Observation of Van Hove singularities in twisted graphene layers
- Magic Angle Spectroscopy
- Atomically thin boron nitride: a tunnelling barrier for graphene devices
- Graphene Bilayers with a Twist
- Tunable Correlated Chern Insulator and Ferromagnetism in Trilayer Graphene/Boron Nitride Moiré Superlattice
- Spectroscopic signatures of many-body correlations in magic angle twisted bilayer graphene
- Fractional Chern insulators in magic-angle twisted bilayer graphene
- Strange metal in magic-angle graphene with near Planckian dissipation
- Untying the insulating and superconducting orders in magic-angle graphene
- Twist-controlled resonant tunnelling in graphene-boron nitride-graphene heterostructures
- Theory of phonon-mediated superconductivity in twisted bilayer graphene
- Giant Phonon-induced Conductance in Scanning Tunneling Spectroscopy of Gate-tunable Graphene
- Evidence for a Goldstone Mode in a Double Layer Quantum Hall System
- Cascade of Phase Transitions and Dirac Revivals in Magic Angle Graphene
- Decoupling superconductivity and correlated insulators in twisted bilayer graphene
- Phonon scattering dominated electron transport in twisted bilayer graphene
- Chiral SDW and d + id superconductivity in the magic-angle twisted bilayer-graphene
- Scanning tunneling spectroscopy of inhomogeneous electronic structure in monolayer and bilayer graphene on SiC
- Topologically Protected Helical States in Minimally Twisted Bilayer Graphene
- Phonon-induced giant linear-in- resistivity in magic angle twisted bilayer graphene: Ordinary strangeness and exotic superconductivity
- Imaging orbital ferromagnetism in a moiré Chern insulator
- Electronic Compressibility of Magic-Angle Graphene Superlattices
- The Quantum Twisting Microscope
- Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe heterostructures
- Moiré phonons in the twisted bilayer graphene
- Evidence for defect-mediated tunneling in hexagonal boron nitride-based junctions
- Phonon-assisted resonant tunneling of electrons in graphene-boron nitride transistors
- Dihedral-angle-corrected registry-dependent interlayer potential for multilayer graphene structures
- Phonon mediated tunneling into graphene
- Tunneling Spectroscopy of Graphene-Boron Nitride Heterostructures
- Coherent Interlayer Tunneling and Negative Differential Resistance with High Current Density in Double Bilayer Graphene-WSe2 Heterostructures
- Signatures of phonon and defect-assisted tunneling in planar metal-hexagonal boron nitride-graphene junctions
- Flat band carrier confinement in magic-angle twisted bilayer graphene
- Phonons in magic-angle twisted bilayer graphene
- Emergence of broken-symmetry states at half-integer band fillings in twisted bilayer graphene
- Electrically tunable multi-terminal SQUID-on-tip
- Understanding and engineering phonon-mediated tunneling into graphene on metal surfaces
- Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on WSe2
- Electron-phonon coupling in a magic-angle twisted-bilayer graphene device
- Coupling to real and virtual phonons in tunneling spectroscopy of superconductors
- Observation of Giant Quantized Phonon Modes in Graphene via Tunneling Spectra
- Phonon Linewidths in Twisted Bilayer Graphene near Magic Angle
- Probing the Electronic Structure of Graphene Near and Far from the Fermi Level via Planar Tunneling Spectroscopy