Attractive and repulsive angulons in superfluid environments
arXiv:2504.15840 · doi:10.1103/PhysRevA.111.043317
Abstract
We investigate the in- and out-of-equilibrium phenomena of a rotational impurity -- specifically, a linear molecule -- coupled to a nonconventional environment, a helium nanodroplet. By employing a Lee-Low-Pines-like transformation combined with a multireference configuration approach, we self-consistently account for the molecule's backaction on the superfluid bath and accurately capture the complex entanglement between the molecule's rotational degrees of freedom and the bath excitations. Our findings reveal that, in the ground state, the impurity induces a density defect in the superfluid bath, giving rise to two novel types of excited states: (a) attractive angulon states, analogous to bound states in photonic crystals and Yu-Shiba-Rusinov bound states in superconductors, localized within the density defect region; and (b) long-lived repulsive angulon states in dilute environments. Rotational spectroscopy demonstrates a crossover from repulsive to attractive angulon states as the bath density increases. This work paves the way for exploring novel nonequilibrium phenomena of quantum impurities in interacting environments.
7 pages, 4 figures
References in corpus (40)
- Ultrastrong coupling regimes of light-matter interaction
- Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
- Universal phase diagram of a strongly interacting Fermi gas with unbalanced spin populations
- Spectroscopy and dynamics in helium nanodroplets
- Helium nanodroplet isolation ro-vibrational spectroscopy: methods and recent results
- Subwavelength vacuum lattices and atom-atom interactions in photonic crystals
- Unconventional quantum optics in topological waveguide QED
- Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains
- Quantum dynamics of ultracold Bose polarons
- Bogoliubov modes of a dipolar condensate in a cylindrical trap
- Lehmann-Symanzik-Zimmermann Reduction Approach to Multi-Photon Scattering in Coupled-Resonator Arrays
- Observation of Bose-Einstein Condensation of Dipolar Molecules
- Real-time Dynamics in U(1) Lattice Gauge Theories with Tensor Networks
- Non-Markovian Dynamics in Chiral Quantum Networks with Spins and Photons
- Markovian and Non-Markovian Dynamics of Quantum Emitters coupled to Two-dimensional Structured Reservoirs
- Scattering in the ultrastrong regime: nonlinear optics with one photon
- Rotation of quantum impurities in the presence of a many-body environment
- Bound states in boson impurity models
- Quantum Emitters in Two-dimensional Structured Reservoirs in the Non-Perturbative Regime
- Variational Study of Fermionic and Bosonic Systems with Non-Gaussian States: Theory and Applications
- Photoionizaton of Pure and Doped Helium Nanodroplets
- Variational study of U(1) and SU(2) lattice gauge theories with Gaussian states in 1+1 dimensions
- Quasiparticle approach to molecules interacting with quantum solvents
- Deformation of a quantum many-particle system by a rotating impurity
- Free Radicals in Superfluid Liquid Helium Nanodroplets: A Pyrolysis Source for the Production of Propargyl Radical
- Ultrastrong coupling few-photon scattering theory
- Roton-Rotation Coupling of Acetylene in He
- Solving quantum impurity problems in and out of equilibrium with variational approach
- Quantum Rotation of HCN and DCN in Helium-4
- Non-Markovian Quantum Optics with Three-Dimensional State-Dependent Optical Lattices
- Effective many-body Hamiltonians of qubit-photon bound states
- Strongly aligned molecules inside helium droplets in the near-adiabatic regime
- Variational principle for quantum impurity systems in and out of equilibrium: application to Kondo problems
- Theory for Self-Bound States of Dipolar Bose-Einstein Condensates
- Low-energy resonances and bound states of aligned bosonic and fermionic dipoles
- Quantum Impurity Models coupled to Markovian and Non Markovian Baths
- A variational approach for many-body systems at finite temperature
- Nature of polaron-molecule transition in Fermi polarons
- Variational theory of angulons and their rotational spectroscopy
- Fluctuation assisted collapses of Bose-Einstein condensates