Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
arXiv:2202.11754 · doi:10.1073/pnas.2205845119
Abstract
Layered bosonic dipolar fluids have been suggested to host a condensate of interlayer molecular bound states. However, its experimental observation has remained elusive. Motivated by two recent experimental works [Hubert et al., Phys. Rev. X 9, 021026 (2019) and D. J. Choksy et al., Phys. Rev. B 103 045126 (2021)], we theoretically study, using numerically exact quantum Monte Carlo calculations, the experimental signatures of collective interlayer pairing in vertically stacked indirect exciton (IX) layers. We find that IX energy shifts associated with each layer evolve non trivially as a function of density imbalance following a nonmonotonic trend with a jump discontinuity at density balance, identified with the interlayer IX molecule gap. This behavior discriminates between the superfluidity of interlayer bound pairs and independent dipole condensation in distinct layers. Considering finite temperature and finite density imbalance conditions, we find a cascade of Berezinskii--Kosterlitz--Thouless (BKT) transitions, initially into a pair superfluid and only then, at lower temperatures, into complete superfluidity of both layers. Our results may provide a theoretical interpretation of existing experimental observations in GaAs double quantum well (DQW) bilayer structures. Furthermore, to optimize the visibility of pairing dynamics in future studies, we present an analysis suggesting realistic experimental settings in GaAs and transition metal dichalcogenide (TMD) bilayer DQW heterostructures where collective interlayer pairing and pair superfluidity can be clearly observed.
arXiv commentPublished version
References in corpus (50)
- Optical detection of Mott and generalized Wigner crystal states in WSe2/WS2 moiré superlattices
- Magic continuum in twisted bilayer WSe2
- A Strongly Dipolar Bose-Einstein Condensate of Dysprosium
- Bose-Einstein Condensation of Erbium
- Abundance of correlated insulating states at fractional fillings of WSe/WS moiré superlattices
- Evidence of high-temperature exciton condensation in 2D atomic double layers
- High-temperature superfluidity with indirect excitons in van der Waals heterostructures
- Ultracold dense samples of dipolar RbCs molecules in the rovibrational and hyperfine ground state
- Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
- Observation of a dipolar quantum gas with metastable supersolid properties
- Macroscopically ordered state in exciton system
- Creation of ultracold RbCs molecules in the rovibrational ground state
- Transient supersolid properties in an array of dipolar quantum droplets
- Long-lived and transient supersolid behaviors in dipolar quantum gases
- Worm Algorithm and Diagrammatic Monte Carlo: A New Approach to Continuous-Space Path Integral Monte Carlo Simulations
- Creation of an ultracold gas of ground-state molecules
- Phase diagram of two-component bosons on an optical lattice
- Quantum phase transition in a two-dimensional system of dipoles
- Observation of Wigner crystal of electrons in a monolayer semiconductor
- Stripe phases in WSe2/WS2 moiré superlattices
- Indirect excitons in van der Waals heterostructures at room temperature
- Exciton correlations in coupled quantum wells and their luminescence blue shift
- Quantum diffusion of dipole-oriented indirect excitons in coupled quantum wells
- Superfluid-Superfluid Phase Transitions in Two-Component Bose System
- Tuning of dipolar interactions and evaporative cooling in a three-dimensional molecular quantum gas
- Pair-supersolid phase in a bilayer system of dipolar lattice bosons
- Localization-Delocalization Transition of Indirect Excitons in Lateral Electrostatic Lattices
- Particle correlations and evidence for dark state condensation in a cold dipolar exciton fluid
- Two-dimensional scattering and bound states of polar molecules in bilayers
- Condensation signatures of photogenerated interlayer excitons in a van der Waals heterostack
- Optical signatures of charge order in a Mott-Wigner state
- High Precision Measurement of the Thermal Exponent for the Three-Dimensional XY Universality Class
- Quantized Vortices and Four-Component Superfluidity of Semiconductor Excitons
- Single-particle vs. pair superfluidity in a bilayer system of dipolar bosons
- Localization and interaction of indirect excitons in GaAs coupled quantum wells
- Quantum phase transitions of tri-layer excitons in atomically thin heterostructures
- "Gray" BCS condensate of excitons and internal Josephson effect
- Mott insulator of strongly interacting two-dimensional excitons
- Phases of dipolar bosons in a bilayer geometry
- Experimental Study of the Exciton Gas Liquid Transition in Coupled Quantum Wells
- Superfluid drag in the two-component Bose-Hubbard model
- Quantum Phases of Dipolar Bosons in Bilayer Geometry
- Quantum Monte Carlo measurement of the chemical potential of helium-4
- Quantum Many-Body Physics with Ultracold Polar Molecules: Nanostructured Potential Barriers and Interactions
- Attractive dipolar coupling between stacked exciton fluids
- Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
- Attractive and repulsive dipolar interaction in bilayers of indirect excitons
- Vertically-coupled dipolar exciton molecules
- Attractive interactions, molecular complexes, and polarons in coupled dipolar exciton fluids
- Ground and excited states of coupled exciton liquids in electron-hole quadrilayers
Cited by in corpus (8)
- Thickness mapping and layer number identification of exfoliated van der Waals materials by Fourier imaging micro-ellipsometry
- Collective interlayer pairing and pair superfluidity in vertically stacked layers of dipolar excitons
- Searching for Unconventional Superfluid in Excitons of Monolayer Semiconductors
- Edge modes in chiral electron double layers
- Electrically tunable and enhanced nonlinearity of moiré exciton-polaritons in transition metal dichalcogenide bilayers
- Nonlocal order parameter of pair superfluids
- Chiral Josephson effect in double layers: the role of particle-hole duality
- Trimer superfluidity of antiparallel dipolar excitons in a bilayer heterostructure