Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe${}_2$ heterostructures

Abstract

We report the experimental observation of strongly enhanced tunneling between graphene bilayers through a WSe${}_2$ barrier when the graphene bilayers are populated with carriers of opposite polarity and equal density. The enhanced tunneling increases sharply in strength with decreasing temperature, and the tunneling current exhibits a vertical onset as a function of interlayer voltage at a temperature of 1.5 K. The strongly enhanced tunneling at overall neutrality departs markedly from single-particle model calculations that otherwise match the measured tunneling current-voltage characteristics well, and suggests the emergence of a many-body state with condensed interbilayer excitons when electrons and holes of equal densities populate the two layers.

5 pages, 5 figures, two supplementary figures

References in corpus (24)

• The electronic properties of graphene
• Boron nitride substrates for high-quality graphene electronics
• Measurement of the optical dielectric function of transition metal dichalcogenide monolayers: MoS2, MoSe2, WS2 and WSe2
• The electronic properties of bilayer graphene
• Bose-Einstein Condensation of Excitons in Bilayer Electron Systems
• Twist-controlled resonant tunnelling in graphene-boron nitride-graphene heterostructures
• Evidence for a Goldstone Mode in a Double Layer Quantum Hall System
• Counterflow measurements in strongly correlated GaAs hole bilayers: evidence for electron-hole pairing
• Vanishing Hall Resistance at High Magnetic Field in a Double Layer Two-Dimensional Electron System
• Excitonic superfluid phase in Double Bilayer Graphene
• Quantum Hall Drag of Exciton Superfluid in Graphene
• High Temperature Superfluidity in Double Bilayer Graphene
• Shubnikov-de Haas oscillations of high mobility holes in monolayer and bilayer WSe${}_2$: Landau level degeneracy, effective mass, and negative compressibility
• Gate-Tunable Resonant Tunneling in Double Bilayer Graphene Heterostructures
• Activated Transport in the individual Layers that form the ${\nu }_T$=1 Exciton Condensate
• Theory of interlayer tunneling in bi-layer quantum Hall ferromagnets
• Coherent Interlayer Tunneling and Negative Differential Resistance with High Current Density in Double Bilayer Graphene-WSe2 Heterostructures
• Observation of a Fractional Quantum Hall State at $\nu =1/4$ in a Wide GaAs Quantum Well
• Excitonic Superfluidity and Screening in Electron-Hole Bilayer Systems
• Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-hole layers
• Observation of fractional quantum Hall effect at even-denominator 1/2 and 1/4 fillings in asymmetric wide quantum wells
• Exciton Transport and Andreev Reflection in a Bilayer Quantum Hall System
• Spatially-indirect Exciton Condensate Phases in Double Bilayer Graphene
• Quantitative description of Josephson-like tunneling in ${\nu }_T=1$ quantum Hall bilayers

Cited by in corpus (76)

• Evidence of high-temperature exciton condensation in 2D atomic double layers
• Strongly correlated excitonic insulator in atomic double layers
• Variational and Diffusion Quantum Monte Carlo Calculations with the CASINO Code
• Correlated electron-hole State in Twisted Double Bilayer Graphene
• Chiral excitonic order from twofold van Hove singularities in kagome metals
• Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-hole layers
• Heterobilayers of 2D materials as a platform for excitonic superfluidity
• Exciton density waves in Coulomb-coupled dual moiré lattices
• Comparing the generalized Kadanoff-Baym ansatz with the full Kadanoff-Baym equations for an excitonic insulator out of equilibrium
• Electrically Controlled Two-Dimensional Electron-Hole Fluids
• Quantum-metric-enabled exciton condensate in double twisted bilayer graphene
• Excitonic Condensate in Flat Valence and Conduction Bands of Opposite Chirality
• Gate tuning from exciton superfluid to quantum anomalous Hall in van der Waals heterobilayer
• How does geometry affect quantum gases?
• Second order Josephson effect in excitonic insulators
• Chester supersolid of spatially indirect excitons in double-layer semiconductor heterostructures
• Magnon-Mediated Indirect Exciton Condensation through Antiferromagnetic Insulators
• Experimental conditions for observation of electron-hole superfluidity in GaAs heterostructures
• Multicomponent screening and superfluidity in gapped electron-hole double bilayer graphene with realistic bands
• High temperature electron-hole superfluidity with strong anisotropic gaps in double phosphorene monolayers
• A doping-dependent switch from one- to two-component superfluidity at temperature above 100K in coupled electron-hole Van der Waals heterostructures
• Tunneling and Fluctuating Electron-Hole Cooper Pairs in Double Bilayer Graphene
• Critical point for Bose-Einstein condensation of excitons in graphite
• Twisted monolayer and bilayer graphene for vertical tunneling transistors
• Emergence of Interlayer Coherence in Twist-Controlled Graphene Double Layers
• Keldysh field theory of dynamical exciton condensation transitions in nonequilibrium electron-hole bilayers
• Evidence for a Superfluid-to-solid Transition of Bilayer Excitons
• BCS-BEC crossover in a $(t_{2g}{)}^4$ Excitonic Magnet
• Josephson-like tunnel resonance and large Coulomb drag in GaAs-based electron-hole bilayers
• Fermi edge singularity in neutral electron-hole system
• Three-dimensional electron-hole superfluidity in a superlattice close to room temperature
• Beginnings of Exciton Condensation in Coronene Analog of Graphene Double Layer
• Theory of intrinsic acoustic plasmons in twisted bilayer graphene
• Resistive signature of excitonic coupling in an electron-hole double layer with a middle barrier
• Theory of strongly paired fermions with arbitrary short-range interactions
• First-principles quantum corrections for carrier correlations in double-layer two-dimensional heterostructures
• Interplay of quantum spin Hall effect and spontaneous time-reversal symmetry breaking in electron-hole bilayers I: Transport properties
• Effects of dynamical screening on the BCS-BEC crossover in double bilayer graphene: Density functional theory for exciton bilayers
• Quadriexcitons and excitonic condensate in a symmetric electron-hole bilayer with valley degeneracy
• Interaction and coherence in 2D bilayers
• Electrical Control of Two-Dimensional Electron-Hole Fluids in the Quantum Hall Regime
• Magnetization dynamics fingerprints of an excitonic condensate $t_{2g}^4$ magnet
• Josephson effect as signature of electron-hole superfluidity in bilayers of van der Waals heterostructures
• Hidden excitonic quantum states with broken time-reversal symmetry
• Correlation functions in electron-electron and electron-hole double quantum wells: Temperature, density and barrier-width dependence
• Excitonic insulators and superfluidity in 2D bilayers without external fields
• Higgs modes in two-dimensional spatially-indirect exciton condensates
• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Dissipationless Spin-Charge Conversion in Excitonic Pseudospin Superfluid
• Electron-hole superfluidity controlled by a periodic potential
• Transition to an excitonic insulator from a two-dimensional conventional insulator
• Effects of intra-layer correlations on electron-hole double-layer superfluidity
• Stationary waves in a superfluid gas of electron-hole pairs in bilayers
• Quantum gases on a torus
• Quantum Transport Properties of an Exciton Insulator/Superconductor Hybrid Junction
• Capacitance and conductance oscillations from electron tunneling into high energy levels of a quantum well in a p-i-n diode
• Interface engineering of van der Waals heterostructures towards energy-efficient quantum devices operating at high temperatures
• Designing exciton-condensate Josephson junction in quantum Hall heterostructures
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Helicoidal excitonic phase in an electron-hole double layer system
• Anderson-Bogoliubov and Carlson-Goldman modes in counterflow superconductors: Case study of a double monolayer graphene
• Exciton Superfluidity in 2D Heterostructures from First Principles: The importance of material specific screening
• Topological fluctuating electron-hole Cooper pairs in graphene-GaAs heterostructures
• Quadriexciton binding energy in electron-hole bilayers
• Longitudinal Josephson effect in systems with pairing of spatially separated electrons and holes
• Topological hybrid electron-hole Cooper pairing
• Mode-selective cloaking and phase-matching cavity resonances in bilayer graphene transport
• Exciton crystal melting and destruction by disorder in bilayer quantum hall system with total filling factor one
• Realization of independent contacts in barrier-separated InAs/GaSb quantum wells
• Anomalous drag in electron-hole condensates with granulated order
• Enhanced Phonon-Assisted Tunneling in Metal -- Twisted Bilayer Graphene Junctions
• Stabilization of sliding ferroelectricity through exciton condensation
• Beyond Random Phase Approximation in electron-hole bilayer superfluidity
• Mode-Resolved Multiband Ballistic Transport and Conductance Thresholds in Bilayer Graphene Junctions
• Probing the features of electron dispersion by tunneling between slightly twisted bilayer graphene sheets
• Collective excitations and quantum incompressibility in electron-hole bilayers