Bipolarons bound by repulsive phonon-mediated interactions

Abstract

When dressed particles (polarons) exchange quantum phonons, the resulting interactions are generally attractive. If the particles have hard-core statistics and the coupling to phonons is through the kinetic energy terms, phonon-mediated interactions are repulsive. Here, we show that such repulsive phonon-mediated interactions bind dressed particles into bipolarons with unique properties. These bipolaron states appear in the gap between phonon excitations, above the two-polaron continuum. While thermodynamically unstable, the bipolaron is protected by energy and momentum conservation and represents a novel quasiparticle with a large dispersion and a negative effective mass near zero momentum. We discuss possible experimental implementation of the conditions for the formation of such repulsively bound bipolarons.

7 pages, 4 figures, 2 appendices

References in corpus (37)

• Feshbach Resonances in Ultracold Gases
• Quantum Spin Liquid States
• Realizing a lattice spin model with polar molecules
• Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
• Repulsively bound atom pairs in an optical lattice
• Fermi polaron-polaritons in charge-tunable atomically thin semiconductors
• Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
• Strongly Correlated Quantum Walks in Optical Lattices
• Bose polarons in the strongly interacting regime
• Supersolids: what and where are they ?
• Polarons, Dressed Molecules, and Itinerant Ferromagnetism in ultracold Fermi gases
• Ultrafast many-body interferometry of impurities coupled to a Fermi sea
• Repulsive Fermi polarons in a resonant mixture of ultracold ${}^6$Li atoms
• Dynamics of single neutral impurity atoms immersed in an ultracold gas
• Sharp transition for single polarons in the one-dimensional Su-Schrieffer-Heeger model
• Preparation of a quantum state with one molecule at each site of an optical lattice
• Cold Atoms and Molecules in Self-Assembled Dipolar Lattices
• Bipolarons in the Extended Holstein Hubbard Model
• Molecular Dipolar Crystals as High Fidelity Quantum Memory for Hybrid Quantum Computing
• Quantum simulator of an open quantum system using superconducting qubits: exciton transport in photosynthetic complexes
• Quantum liquid of repulsively bound pairs of particles in a lattice
• Observation of the phononic Lamb shift with a synthetic vacuum
• Tunable Holstein model with cold polar molecules
• Analog Superconducting Quantum Simulator for Holstein Polarons
• Investigating polaron transitions with polar molecules
• Quantum Simulations of Extended Hubbard Models with Dipolar Crystals
• Quantum simulation of small-polaron formation with trapped ions
• Quantum simulation of electron-phonon interactions in strongly deformable materials
• Transmon-based simulator of nonlocal electron-phonon coupling: A platform for observing sharp small-polaron transitions
• Towards Outperforming Classical Algorithms with Analog Quantum Simulators
• Phases and phase transitions of frustrated hard-core bosons on a triangular ladder
• The polaron paradigm: a dual coupling effective band model
• Dissipative binding of atoms by non-conservative forces
• Supersolid in a one-dimensional model of hard-core bosons
• Few-particle Green's functions for strongly correlated systems on infinite lattices
• Long-range and frustrated spin-spin interactions in crystals of cold polar molecules
• Phonon-mediated repulsion, sharp transitions and (quasi)self-trapping in the extended Peierls-Hubbard model

Cited by in corpus (12)

• Extrapolating quantum observables with machine learning: Inferring multiple phase transitions from properties of a single phase
• Fractons from polarons
• Polaron Problems in Ultracold Atoms: Role of a Fermi Sea across Different Spatial Dimensions and Quantum Fluctuations of a Bose Medium
• Polarons and their induced interactions in highly imbalanced triple mixtures
• Numerically Exact Generalized Green's Function Cluster Expansions for Electron-Phonon Problems
• Mobile bound states of Rydberg excitations in a lattice
• Medium-induced bosonic clusters in a Bose-Fermi mixture: Towards simulating cluster formations in neutron-rich matter
• Anderson localization of composite particles
• Excitonic density-waves, bi-excitons and orbital selective pairing in two-orbital correlated chains
• Extrapolation of polaron properties to low phonon frequencies by Bayesian machine learning
• Composite polaron formed on surface of two-dimensional lattice system in weak coupling regime
• Exploring universal and non-universal regimes of trimers from three-body interactions in one-dimensional lattices