Coherent Interlayer Tunneling and Negative Differential Resistance with High Current Density in Double Bilayer Graphene-WSe2 Heterostructures

Abstract

We demonstrate gate-tunable resonant tunneling and negative differential resistance between two rotationally aligned bilayer graphene sheets separated by bilayer WSe2. We observe large interlayer current densities of 2 uA/um2 and 2.5 uA/um2, and peak-to-valley ratios approaching 4 and 6 at room temperature and 1.5 K, respectively, values that are comparable to epitaxially grown resonant tunneling heterostructures. An excellent agreement between theoretical calculations using a Lorentzian spectral function for the two-dimensional (2D) quasiparticle states, and the experimental data indicates that the interlayer current stems primarily from energy and in-plane momentum conserving 2D-2D tunneling, with minimal contributions from inelastic or non-momentum-conserving tunneling. We demonstrate narrow tunneling resonances with intrinsic half-widths of 4 and 6 meV at 1.5 K and 300 K, respectively.

23 pages, 5 figures

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• Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe${}_2$ heterostructures
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• Spin-Conserving Resonant Tunneling in Twist-Controlled WSe2-hBN-WSe2 Heterostructures
• Negative Differential Resistance in Carbon-Based Nanostructures
• Gate-versus defect-induced voltage drop and negative differential resistance in vertical graphene heterostructures
• Emergence of Interlayer Coherence in Twist-Controlled Graphene Double Layers
• Quantum Lifetime Spectroscopy and Magnetotunneling in Double Bilayer Graphene Heterostructures
• Magnitude of the Current in Two-Dimensional Interlayer Tunneling Devices
• Density dependence of the excitation gaps in an undoped Si/SiGe double-quantum-well heterostructure
• Plasmons in N-layer systems
• Enhanced Phonon-Assisted Tunneling in Metal -- Twisted Bilayer Graphene Junctions
• Electrically driven plasmon-polaritonic bistability in Dirac electron tunneling transistors
• Probing the features of electron dispersion by tunneling between slightly twisted bilayer graphene sheets