Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-hole layers

Abstract

We report quantum Monte Carlo evidence of the existence of large gap superfluidity in electron-hole double layers over wide density ranges. The superfluid parameters evolve from normal state to BEC with decreasing density, with the BCS state restricted to a tiny range of densities due to the strong screening of Coulomb interactions, which causes the gap to rapidly become large near the onset of superfluidity. The superfluid properties exhibit similarities to ultracold fermions and iron-based superconductors, suggesting an underlying universal behavior of BCS-BEC crossovers in pairing systems.

arXiv comment6 pages, 4 figures, 4 pages Supplementary. Submitted to Physical Review Letters

References in corpus (42)

• Observation of resonance condensation of fermionic atom pairs
• Strong Coulomb drag and broken symmetry in double-layer graphene
• Continuum variational and diffusion quantum Monte Carlo calculations
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Jastrow correlation factor for atoms, molecules, and solids
• Room-Temperature Superfluidity in Graphene Bilayers
• Excitonic superfluid phase in Double Bilayer Graphene
• Optimization of quantum Monte Carlo wave functions by energy minimization
• Quantum Hall Drag of Exciton Superfluid in Graphene
• High Temperature Superfluidity in Double Bilayer Graphene
• Analysis of the exciton-exciton interaction in semiconductor quantum wells
• Quantum Monte Carlo Simulations of the BCS-BEC Crossover at Finite Temperature
• Excitonic condensation in a symmetric electron-hole bilayer
• Bulk and Collective Properties of a Dilute Fermi Gas in the BCS-BEC Crossover
• Coulomb Drag in the Exciton Regime in Electron-Hole Bilayers
• Electron screening and excitonic condensation in double-layer graphene systems
• Electron-electron interaction and electron-hole asymmetry in bilayer graphene
• Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe${}_2$ heterostructures
• Quantitative comparison between theoretical predictions and experimental results for the BCS-BEC crossover
• Anomalous Coulomb drag in electron-hole bilayers
• Evolution of the Normal State of a Strongly Interacting Fermi Gas from a Pseudogap Phase to a Molecular Bose Gas
• Momentum distribution and condensate fraction of a Fermi gas in the BCS-BEC crossover
• Negative Coulomb Drag in Double Bilayer Graphene
• Condensate Fraction of a Fermi Gas in the BCS-BEC Crossover
• Cooper pairing of electrons and holes in graphene bilayer: Correlation effects
• Interaction-Enhanced Coherence Between Two-Dimensional Dirac Layers
• Giant Frictional Drag in Double Bilayer Graphene Heterostructures
• Boosting the accuracy and speed of quantum Monte Carlo: size-consistency and time-step
• Excitons and biexcitons in symmetric electron-hole bilayers
• Band-edge BCS-BEC crossover in a two-band superconductor: physical properties and detection parameters
• Solution of the Bogoliubov-de Gennes equations at zero temperature throughout the BCS-BEC crossover: Josephson and related effects
• Excitonic Superfluidity and Screening in Electron-Hole Bilayer Systems
• Framework for constructing generic Jastrow correlation factors
• Exciton-exciton interaction and biexciton formation in bilayer systems
• Strategies for improving the efficiency of quantum Monte Carlo calculations
• Probing the topological exciton condensate via Coulomb drag
• Ultracold atoms at unitarity within quantum Monte Carlo
• Extracting the condensate density from projection experiments with Fermi gases
• Quantum Monte Carlo calculation of the energy band and quasiparticle effective mass of the two-dimensional Fermi fluid
• Fixed-node diffusion Monte Carlo study of the BCS-BEC crossover in a bilayer system of fermionic dipoles
• Comment on "Electron screening and excitonic condensation in double-layer graphene systems"

Cited by in corpus (37)

• Strongly correlated excitonic insulator in atomic double layers
• Variational and Diffusion Quantum Monte Carlo Calculations with the CASINO Code
• Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe${}_2$ heterostructures
• Chester supersolid of spatially indirect excitons in double-layer semiconductor heterostructures
• 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
• Quantum anomalous Hall effect and electric-field-induced topological phase transition in AB-stacked MoTe${}_2$/WSe${}_2$ moiré heterobilayers
• Three-dimensional electron-hole superfluidity in a superlattice close to room temperature
• First-principles quantum corrections for carrier correlations in double-layer two-dimensional heterostructures
• Tunable BCS-BEC crossover, reentrant, and hidden quantum phase transitions in two-band superconductors with tunable valence and conduction bands
• Theory of strongly paired fermions with arbitrary short-range interactions
• 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
• Eliashberg theory for dynamical screening in bilayer exciton condensation
• Interaction and coherence in 2D bilayers
• Ground-state properties of electron-electron biwire systems
• Correlation functions in electron-electron and electron-hole double quantum wells: Temperature, density and barrier-width dependence
• Josephson effect as signature of electron-hole superfluidity in bilayers of van der Waals heterostructures
• Superfluidity of dipolar magnetoexcitons in doped double-layered $\alpha$-${\mathcal{T}}_3$ lattice in a strong magnetic field
• Mott-Enhanced Exciton Condensation in a Hubbard bilayer
• Higgs modes in two-dimensional spatially-indirect exciton condensates
• Superfluidity of dipolar excitons in a double layer of $\alpha -T_3$ with a mass term
• Effects of intra-layer correlations on electron-hole double-layer superfluidity
• Spin susceptibility in interacting two-dimensional semiconductors and bilayer systems at first order: Kohn anomalies and spin density wave ordering
• Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
• Capacitance and conductance oscillations from electron tunneling into high energy levels of a quantum well in a p-i-n diode
• Helicoidal excitonic phase in an electron-hole double layer system
• Antiparticle of exciton in semimetals
• Predictive power of the Berezinskii-Kosterlitz-Thouless theory based on Renormalization Group throughout the BCS-BEC crossover in 2D superconductors
• Low-temperature Depletion of Superfluid Density in the Absence of Galilean Symmetry
• Topological fluctuating electron-hole Cooper pairs in graphene-GaAs heterostructures
• Longitudinal Josephson effect in systems with pairing of spatially separated electrons and holes
• Beyond Random Phase Approximation in electron-hole bilayer superfluidity
• BCS-BEC crossover in a quasi-two-dimensional Fermi superfluid